United Airlines (UAL) 424B5Prospectus supplement for primary offering

unfavorable economic and political conditions in the United States and globally;

the highly competitive nature of the global airline industry and susceptibility of the industry to price discounting and changes in capacity;

high and/or volatile fuel prices or significant disruptions in the supply of aircraft fuel;

our reliance on third-party service providers and the impact of any significant failure of these parties to perform as expected, or interruptions in our relationships with these providers or their provision of services;

adverse publicity, harm to our brand, reduced travel demand, potential tort liability and voluntary or mandatory operational restrictions as a result of an accident, catastrophe or incident involving us, our regional carriers, our codeshare partners, or another airline;

increasing privacy and data security obligations or a significant data breach;

disruptions to our regional network and United Express flights provided by third-party regional carriers;

the failure of our significant investments in other airlines, equipment manufacturers and other aviation industry participants to produce the returns or results we expect;

further changes to the airline industry with respect to alliances and joint business arrangements or due to consolidations;

our reliance on single suppliers to source a majority of our aircraft and certain parts, and the impact of any failure to obtain timely deliveries, additional equipment or support from any of these suppliers;

In addition, we are a Delaware corporation, and the anti-takeover provisions of the Delaware General Corporation Law (the “DGCL”) impose various impediments to the ability of a third party to acquire control of us, even if a change in control would be beneficial to our existing stockholders. These provisions could also impede a merger, takeover or other business combination involving us or discourage a potential acquirer from making a tender offer for our common stock, engaging in a proxy fight or conducting open market purchases, which, under certain circumstances, could reduce the market price of our common stock.

The closing price for our common stock has varied between a high of $62.45 on March 17, 2021 and a low of $30.17 on July 9, 2020 in the twelve-month period ended on June 29, 2021. Volatility in the market price of our common stock may prevent you from being able to sell the shares at or above the price you paid for them. The market price of our common stock could fluctuate significantly for various reasons which include:

In addition, in recent periods, the stock market has experienced extreme declines and volatility. This volatility has had a significant negative impact on the market price of securities issued by many companies, including us and other companies in our industry.

The sale or availability for sale of substantial amounts of our common stock could adversely impact its price. Our certificate of incorporation authorizes us to issue 1,000,000,000 shares of common stock. On June 25, 2021, there were 323,610,765 shares of common stock outstanding. Accordingly, a substantial number of shares of our common stock are outstanding and available for sale in the market. In addition, we may be obligated to issue additional shares of common stock upon the conversion of outstanding

The 2021 Series C warrants must be exercised on or before 5:00 p.m., New York City time, on April 29, 2026;

The 2021 Series D warrants must be exercised on or before 5:00 p.m., New York City time, on April 29, 2026;

The 2021 Series E warrants must be exercised on or before 5:00 p.m., New York City time, on June 10, 2026; and

The Loan warrants must be exercised on or before 5:00 p.m., New York City time, on September 28, 2025.

In January 2021, pursuant to the Payroll Support Program established under the Coronavirus Aid, Relief, and Economic Security Act (the “CARES Act”), as extended by the Consolidated Appropriations Act, 2021, we agreed to issue in a private placement to Treasury warrants to purchase a number of shares of our common stock determined by a formula set forth in the warrant agreement dated as of January 15, 2021, and pursuant thereto we have issued the 2021 Series C warrants which may be offered pursuant to this prospectus supplement. In April 2021, pursuant to the Payroll Support Program established under Section 7301 of the American Rescue Plan Act of 2021 (the “ARP”), we agreed to issue in a private placement to Treasury warrants to purchase a number of shares of our common stock determined by a formula set forth in the warrant agreement dated as of April 29, 2021, and pursuant thereto we have issued the 2021 Series D warrants and 2021 Series E warrants which may be offered pursuant to this prospectus supplement. In addition, in September 2020, pursuant to the Loan Program established under Section 4003(b) of the CARES Act, we agreed to issue in a private placement to Treasury warrants to purchase a number of shares of our common stock determined by a formula set forth in the warrant agreement dated as of September 28, 2020, and pursuant thereto we have issued the Loan warrants which may be offered pursuant to this prospectus supplement.

Previously, in connection with the receipt of financial assistance under the original Payroll Support Program established under the CARES Act, in April 2020, we agreed to issue in a private placement to Treasury warrants to purchase a number of shares of our common stock determined by a formula set forth in the warrant agreement dated as of April 20, 2020, and pursuant thereto we have issued warrants to purchase up to approximately 4.8 million shares of our common stock which may be offered pursuant to our prospectus supplement dated November 23, 2020. In addition, in connection with the receipt of financial assistance under the Payroll Support Program established under the CARES Act, as extended by the Consolidated Appropriations Act, 2021, in January 2021, we agreed to issue in a private placement to Treasury warrants to purchase a number of shares of our common stock determined by a formula set forth in the warrant agreement dated as of January 15, 2021, and pursuant thereto we have issued warrants to purchase up to approximately 1.7 million shares of our common stock which may be offered pursuant to our prospectus supplement dated March 31, 2021.

As described on Treasury’s website, Treasury is the executive agency of the U.S. government responsible for promoting economic prosperity and ensuring the financial security of the United States. We are registering the sale of the warrants (and the shares of common stock issuable upon exercise of the warrants) offered by this prospectus supplement and the accompanying prospectus on behalf of Treasury as the selling securityholder. Information about additional selling securityholders may be set forth in a prospectus supplement, in a post-effective amendment or in filings that we make with the SEC under the Exchange Act, which are incorporated by reference in this prospectus supplement.

The table below sets forth information with respect to the beneficial ownership of the warrants held as of June 30, 2021 by the selling securityholder, the number of warrants that may be offered hereby, and information with respect to warrants to be beneficially owned by the selling securityholder assuming all the warrants are sold. There can be no assurance that the selling securityholder will sell any or all of the warrants or the shares of common stock underlying the warrants.

The warrants that may be offered pursuant to this prospectus supplment currently are exercisable for 3,424,054 shares of our common stock, which represents 1.0% of our common stock outstanding as of June 25, 2021. The actual number of shares that could be issued upon exercise of the warrants will depend upon the market price of our common stock at the time of exercise and other factors, including the adjustment provisions described above under “Description of Warrants — Adjustments to the Warrants,” and cannot be determined at this time. To the best of our knowledge, other than the other 6,504,295 warrants issued pursuant to the Loan Program, the original Payroll Support Program and the extensions of the Payroll

The holder of the share of Class Pilot MEC Junior Preferred Stock has the following voting rights:

Until the Distribution Time, the Rights are associated with common stock and evidenced by common stock certificates or, in the case of uncertificated shares of common stock, the book-entry account that evidences record ownership of such shares, which contains a notation incorporating the Tax Benefits Preservation Plan by reference, and the Rights are transferable with and only with the underlying shares of common stock.

Subject to certain exceptions, the Rights become exercisable and trade separately from common stock only upon the “Distribution Time,” which occurs upon the earlier of:

The Board may determine that any person is an Acquiring Person if such person becomes the beneficial owner of 4.9% of the then-outstanding shares of common stock under the regulations promulgated under the U.S. Internal Revenue Code of 1986, as amended (the “Code”).

In addition, the Tax Benefits Preservation Plan provides that no person or group will become an Acquiring Person as a result of share purchases or issuances directly from UAL or through an underwritten offering approved by the Board. Also, a person or group will not be an Acquiring Person if the Board determines that such person or group has become an Acquiring Person inadvertently and such person or group as promptly as practicable divests a sufficient number of shares so that such person or group would no longer be an Acquiring Person. There are also certain exceptions for an “investment advisor” to mutual funds or a trustee of trusts qualified under Section 401(a) of the Code sponsored by unrelated corporations, unless the Board determines, in its reasonable discretion, that such investment advisor or trustee is deemed to beneficially own 4.9% or more of the shares of common stock then outstanding under specified regulations promulgated under the Code.

Certain synthetic interests in securities created by derivative positions, whether or not such interests are considered to be ownership of the underlying common stock or are reportable for purposes of Regulation 13D of the Exchange Act are treated as beneficial ownership of the number of shares of common stock equivalent to the economic exposure created by the derivative position, to the extent actual shares of common stock are directly or indirectly held by counterparties to the derivatives contracts. In addition, for purposes of the Tax Benefits Preservation Plan, a person or group is deemed to beneficially own shares that such person is deemed to directly, indirectly or constructively own (as determined for purposes of Section 382 of the Code or the regulations promulgated under the Code), and Warrants and Warrant Shares (as each is defined in the Warrant Agreement, dated as of April 20, 2020, between UAL and the U.S. Treasury Department, the Warrant Agreement, dated as of September 28, 2020, between UAL and the United States Department of the Treasury, and the Warrant Agreement, dated as of January 15, 2021, between UAL and the U.S. Treasury Department) are disregarded for purposes of determining beneficial ownership.

The Rights will expire on the earliest to occur of (a) the close of business on December 4, 2023 (the “Final Expiration Time”), (b) the time at which the Rights are redeemed or exchanged by UAL (as described below), (c) the close of business on the first business day following the certification of the voting results of UAL’s 2021 annual meeting of stockholders, if stockholder approval of the Tax Benefits Preservation Plan has not been obtained at such meeting, (d) upon the closing of any merger or other acquisition transaction involving UAL pursuant to a merger or other acquisition agreement that has been approved by the Board before any person or group becomes an Acquiring Person or (e) the time at which the Board determines that the NOLs and certain other tax attributes are utilized in all material respects or that an ownership change under Section 382 of the Code would not adversely impact in any material respect the time period in which UAL could use the NOLs and other tax attributes or materially impair the amount of NOLs and other tax attributes that could be used by UAL in any particular time period, for applicable tax purposes (the earliest of (a), (b), (c), (d) and (e) being herein referred to as the “Expiration Time”).

In the event that any person or group (other than certain exempt persons) becomes an Acquiring Person (a “Flip-in Event”), each holder of a Right (other than such Acquiring Person, any of its affiliates or associates or certain transferees of such Acquiring Person or of any such affiliate or associate, whose Rights automatically become null and void) will have the right to receive, upon exercise, common stock having a value equal to two times the exercise price of the Right.

For example, at an exercise price of $250.00 per Right, each Right not owned by an Acquiring Person (or by certain related parties) following a Flip-in Event would entitle its holder to purchase $500.00 worth

In the event that, at any time following the Stock Acquisition Date, any of the following occurs (each, a “Flip-over Event”):

Each share of Series A Preferred Stock, if issued: will not be redeemable, will entitle the holder thereof, when, as and if declared, to quarterly dividend payments equal to the greater of $1,000 per share and 1,000 times the amount of all cash dividends plus 1,000 times the amount of non-cash dividends or other distributions paid on one share of common stock, will entitle the holder thereof to receive $1,000 plus accrued and unpaid dividends per share upon liquidation and, if shares of common stock are exchanged via merger, consolidation or a similar transaction, will entitle the holder thereof to a per share payment equal to the payment made on 1,000 shares of common stock.

The exercise price payable, and the number of shares of Series A Preferred Stock or other securities or property issuable, upon exercise of the Rights are subject to adjustment from time to time to prevent dilution:

With certain exceptions, no adjustment in the exercise price will be required until cumulative adjustments amount to at least 1% of the exercise price. No fractional shares of Series A Preferred Stock will be issued and, in lieu thereof, an adjustment in cash will be made based on the market price of the Series A Preferred Stock on the last trading day prior to the date of exercise.

At any time prior to the earlier of (i) the close of business on the tenth (10th) day following the Stock Acquisition Date or (ii) the Final Expiration Time, UAL may redeem the Rights in whole, but not in part, at a price of $0.001 per Right (subject to adjustment and payable in cash, common stock or other consideration deemed appropriate by the Board). Immediately upon the action of the Board authorizing any redemption or at such later time as the Board may establish for the effectiveness of the redemption, the Rights will terminate and the only right of the holders of Rights will be to receive the redemption price.

The bylaws contain a proxy access right provision to permit a stockholder or group of up to 20 stockholders satisfying specified eligibility requirements to include director nominees in UAL’s proxy materials for annual meetings of stockholders. The maximum number of stockholder nominees permitted under these proxy access provisions is the greater of two or 20% of the Board elected by the holders of common stock. To be eligible to use these proxy access provisions, such stockholder (or group) must, among other requirements:

The foregoing proxy access right is subject to additional eligibility, procedural and disclosure requirements set forth in the bylaws.

Pursuant to Section 228 of the DGCL, any action required to be taken at any annual or special meeting of the stockholders may be taken without a meeting, without prior notice and without a vote if a consent or consents in writing, setting forth the action so taken, is signed by the holders of outstanding stock having not less than the minimum number of votes that would be necessary to authorize or take such action at a meeting at which all shares of stock entitled to vote thereon were present and voted, unless the certificate of incorporation provides otherwise. The certificate of incorporation provides that any action required or permitted to be taken by UAL stockholders must be effected at a duly called annual or special meeting of stockholders and may not be effected by consent in writing by such stockholders.

We are subject to the provisions of Section 203 of the DGCL regulating corporate takeovers. Section 203 prevents certain Delaware corporations from engaging, under certain circumstances, in a “business combination” ​(as defined therein), which includes, among other things, a merger or sale of more than 10% of the corporation’s assets, with any interested stockholder for three years following the date that the stockholder became an interested stockholder. An interested stockholder is a stockholder who acquired 15% or more of the corporation’s outstanding voting stock or an affiliate or associate of such person.

The following is a general discussion of the material U.S. federal income and certain estate tax consequences of the purchase, exercise, disposition and lapse of warrants to purchase shares of our common stock (such shares, the “warrant shares”) acquired pursuant to this offering and the purchase, ownership and disposition of warrant shares (together with the warrants, the “securities”).

This discussion does not address the U.S. federal tax consequences to an entity treated as a partnership for U.S. federal income tax purposes or to persons investing through such an entity. If an entity treated as a partnership holds securities, the tax treatment of a partner will generally depend on the status of the partner and the activities of the partnership. A partner in a partnership considering an investment in securities should consult its own tax advisors as to the U.S. federal income and estate tax consequences of being a partner in a partnership that purchases, owns or disposes of securities.

This summary assumes that the securities are held as a capital asset (generally, property held for investment). This summary is of a general nature and thus does not address all of the U.S. federal income and estate tax considerations that might be relevant to a holder of securities in light of its particular circumstances or to a holder of securities subject to special treatment under U.S. federal tax laws (such as banks, insurance companies, dealers in securities or other holders of securities that generally mark their securities to market for U.S. federal income tax purposes, foreign governments, international organizations, tax-exempt entities, “controlled foreign corporations,” “passive foreign investment companies,” regulated investment companies, real estate investment trusts, certain former citizens or residents of the United States, or holders of securities that hold securities as part of a straddle, hedging transaction, conversion transaction or integrated transaction or that purchase or sell securities as part of a wash sale for U.S. federal income tax purposes). Furthermore, this summary does not discuss any aspects of U.S. federal gift, state, local or non-U.S. taxation. This summary is based on current provisions of the U.S. Internal Revenue Code of 1986, as amended (the “Code”), U.S. Treasury regulations promulgated or proposed thereunder, judicial opinions, published positions of the U.S. Internal Revenue Service (the “IRS”) and other applicable authorities, all of which are subject to change or differing interpretation, possibly with retroactive effect. Each prospective purchaser of securities is advised to consult its own tax advisor with respect to the U.S. federal, state, local and non-U.S. tax consequences of purchasing, owning and disposing of securities. No assurance exists that the IRS will not challenge any of the tax consequences described herein, and we have not obtained, nor do we intend to obtain, an opinion of counsel with respect to the U.S. federal income or estate tax consequences to a holder of securities of purchasing, owning and disposing of securities.

PROSPECTIVE INVESTORS CONSIDERING THE PURCHASE OF THE SECURITIES SHOULD CONSULT THEIR OWN TAX ADVISORS CONCERNING THE APPLICATION OF U.S. FEDERAL TAX LAWS TO THEIR PARTICULAR SITUATIONS AS WELL AS ANY CONSEQUENCES ARISING UNDER THE LAWS OF ANY OTHER TAXING JURISDICTION AND ANY APPLICABLE TAX TREATY.

For purposes of this discussion, a “U.S. Holder” is a beneficial owner of securities that is treated for U.S. federal income tax purposes as:

fails to furnish the holder’s taxpayer identification number, which for an individual is ordinarily his or her social security number;

furnishes an incorrect taxpayer identification number;

is notified by the IRS that the holder previously failed to properly report payments of interest or dividends; or

fails to certify under penalties of perjury that the holder has furnished a correct taxpayer identification number and that the IRS has not notified the holder that the holder is subject to backup withholding.

If, however, the Non-U.S. Holder provides a valid IRS Form W-8ECI, certifying that the dividend is effectively connected with the Non-U.S. Holder’s conduct of a trade or business within the United States, and otherwise complies with applicable certification requirements, the dividend will not be subject to the withholding tax described above. Instead, such dividend will be subject to U.S. federal income tax in the manner described below under “— Effectively Connected Income.”

Except as otherwise discussed below, a Non-U.S. Holder generally will not be subject to U.S. federal income tax on any gain realized upon a sale, exchange or other taxable disposition of securities unless (i) such gain is effectively connected with the Non-U.S. Holder’s conduct of a U.S. trade or business (and, if an income tax treaty applies, the gain is attributable to a permanent establishment or fixed base maintained by such Non-U.S. Holder in the United States), (ii) the Non-U.S. Holder is an individual who is present in the United States for a period or periods aggregating 183 days or more during the year in which such sale, exchange or other taxable disposition occurs and certain other conditions are met, or (iii) we are or have been a “United States real property holding corporation” ​(“USRPHC”) for U.S. federal income tax purposes at any time during the shorter of (x) the five-year period ending on the date of such sale, exchange or other disposition and (y) such Non-U.S. Holder’s holding period with respect to such securities, and, provided that

our common stock is regularly traded on an established securities market within the meaning of applicable U.S. Treasury regulations, such Non-U.S. Holder has held, directly or constructively, at any time during said period, more than 5% of our common stock. We do not believe that we are or will become a USRPHC; however, there can be no assurance in that regard.

an underwritten offering;

ordinary brokerage transactions and transactions in which the broker-dealer solicits purchasers;

block trades in which the broker-dealer will attempt to sell the securities as agent but may position and resell a portion of the block as principal to facilitate the transaction;

purchases by a broker-dealer as principal and resale by the broker-dealer for its account;

an exchange distribution in accordance with the rules of the applicable exchange;

privately negotiated transactions;

settlement of short sales;

in transactions through broker-dealers that agree with the Selling Stockholders to sell a specified number of such securities at a stipulated price per security;

through the writing or settlement of options or other hedging transactions, whether through an options exchange or otherwise;

a combination of any such methods of sale; or

any other method permitted pursuant to applicable law.

The SEC allows us to “incorporate by reference” certain information into this prospectus supplement and the accompanying prospectus from certain documents that we file with the SEC. By incorporating by reference, we are disclosing important information to you by referring you to documents we file separately with the SEC. The information incorporated by reference is deemed to be part of this prospectus supplement and the accompanying prospectus, except for information incorporated by reference that is modified or superseded by information contained in this prospectus supplement or the accompanying prospectus or in any other subsequently filed document that also is incorporated by reference herein or therein. These documents contain important information about us, our business and our finances. The following documents previously filed with the SEC are incorporated by reference into this prospectus supplement and the accompanying prospectus, except for any document or portion thereof deemed to be “furnished” and not filed in accordance with SEC rules:

We also incorporate by reference all future documents we file with the SEC pursuant to Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act prior to the termination of the offering of our common stock to which this prospectus supplement and the accompanying prospectus relate, except for any document or portion thereof deemed to be “furnished” and not filed in accordance with SEC rules.

The information relating to us contained in this prospectus supplement and the accompanying prospectus does not purport to be comprehensive and should be read together with the information contained in the documents incorporated or deemed to be incorporated by reference into this prospectus supplement and the accompanying prospectus.

An investment in our securities involves risk. Before you invest in securities issued by us, you should carefully consider the risks involved. Accordingly, you should carefully consider:

The discussion of risks related to our business contained in or incorporated by reference into this prospectus or into any prospectus supplement comprises material risks of which we are aware. If any of the events or developments described actually occurs, our business, financial condition or results of operations would likely suffer.

This prospectus, the accompanying prospectus supplement and the documents incorporated or deemed incorporated by reference herein and therein contain “forward-looking statements” subject to the safe harbor created by the Private Securities Litigation Reform Act of 1995. These forward-looking statements are based on the current beliefs and expectations of our management with respect to future events and are subject to significant risks and uncertainties. These statements relate to future events, including our future performance, and management’s expectations, beliefs, intentions, plans or projections relating to the future, and some of these statements can be identified by the use of forward-looking terminology such as “believes,” “expects,” “anticipates,” “estimates,” “projects,” “intends,” “seeks,” “future,” “continue,” “contemplate,” “plans,” “predicts,” “would,” “will,” “may,” “should” and the negative or other variations of those terms or comparable terminology or by discussion of strategy, plans, opportunities or intentions. As a result, actual results, performance or achievements may vary materially from those anticipated by the forward-looking statements.

Among the factors that could cause actual results, performance or achievements to differ materially from those indicated by such forward-looking statements are:

Common Stock are not subject to calls or assessments. No personal liability will attach to holders under the laws of the State of Delaware (UAL’s state of incorporation) or of the State of Illinois (the state in which UAL’s principal place of business is located). There is no classification of the Board.

The number of shares constituting such series and the distinctive designation of the series;

The dividend rate on the shares of the series, the conditions and dates upon which dividends thereon shall be payable, the extent, if any, to which dividends thereon shall be cumulative, and the relative rights of preference, if any, of payment of dividends thereon;

The amount payable in respect of the shares of the series, in the event of any liquidation, dissolution or winding up of UAL, which amount may, but need not, vary according to the time or circumstances of such action, and the relative rights of preference, if any, of payment of such amount;

Any requirement as to a sinking fund for the shares of the series, or any requirement as to the redemption, purchase or other retirement by UAL of the shares of the series;

The voting rights, if any, to which the holders of shares of the series shall be entitled in addition to the voting rights provided by law (provided that, except as required by law or as approved by the stockholders, UAL shall not issue Preferred Stock with voting rights unless such Preferred Stock is convertible into UAL Common Stock, in which case such Preferred Stock may vote with the UAL Common Stock on an as-converted basis); and

Any other term, condition or provision with respect to the series not inconsistent with the provisions of Article Fourth, Part I of UAL’s amended and restated certificate of incorporation or any resolution adopted by the Board pursuant thereto.

The holder of the share of Class Pilot MEC Junior Preferred Stock has the following voting rights:

(a)   Until such time (the “ALPA Termination Date”) as there are no longer any persons represented by ALPA (or a successor to the MEC by merger or reorganization of ALPA) employed by UAL or any of its affiliates or the collective bargaining agreement between UAL or any of its affiliates and ALPA has been amended so that such agreement no longer provides that ALPA has the right to appoint a director to the Board, the holder of the share of Class Pilot MEC Junior Preferred Stock shall have the right (i) voting as a separate class, to (1) elect one director to the Board at each annual meeting of stockholders for a term of office to expire at the succeeding annual meeting of stockholders, (2) remove such director with or without cause and (3) fill any vacancies in such directorship resulting from death, resignation, disqualification, removal or other cause; and (ii) voting together as a single class with the holders of UAL Common Stock and the holders of such other classes or series of stock that vote together with the UAL Common Stock as a single class, to vote on all matters submitted to a vote of the holders of UAL Common Stock (other than the election of directors), except as otherwise required by law.

(b)   The affirmative vote of the holder of the share of Class Pilot MEC Junior Preferred Stock, voting as a separate class, is necessary to authorize, effect or validate any amendment, alteration or repeal (including any amendment, alteration or repeal by operation of merger or consolidation) of any of the provisions of UAL’s amended and restated certificate of incorporation that would adversely affect the powers, preferences or special rights of the Class Pilot MEC Junior Preferred Stock.

Upon any liquidation, dissolution or winding up of UAL, after all securities ranking prior to the Class IAM Junior Preferred Stock, including any shares of UAL’s Preferred Stock, have been paid in full that to which they are entitled, the holder of the Class IAM Junior Preferred Stock will be entitled to receive $0.01 for the share of Class IAM Junior Preferred Stock, but such holder shall not be entitled to any further payment.

(a)   Until such time (the “IAM Termination Date”) as there are no longer any persons represented by the IAM (or a successor to the IAM by merger or reorganization of the IAM) employed by UAL or any of its affiliates or a certain letter agreement between UAL and the IAM no longer provides that the IAM has the right to appoint a director to the Board, the holder of the share of Class IAM Junior Preferred Stock shall have the right (i) voting as a separate class, to (1) elect one director to the Board at each annual meeting of stockholders for a term of office to expire at the succeeding annual meeting of stockholders, (2) remove such director with or without cause and (3) fill any vacancies in such directorship resulting from death, resignation, disqualification, removal or other cause; and (ii) voting together as a single class with the holders of UAL Common Stock and the holders of such other classes or series of stock that vote together with the UAL Common Stock as a single class, to vote on all matters submitted to a vote of the holders of UAL Common Stock (other than the election of directors), except as otherwise required by law.

(b)   The affirmative vote of the holder of the share of Class IAM Junior Preferred Stock, voting as a separate class, is necessary to authorize, effect or validate any amendment, alteration or repeal (including any amendment, alteration or repeal by operation of merger or consolidation) of any of the provisions of UAL’s amended and restated certificate of incorporation that would adversely affect the powers, preferences or special rights of the Class IAM Junior Preferred Stock.

The share of Class IAM Junior Preferred Stock will be automatically redeemed by UAL, at a price of $0.01 per share, on the IAM Termination Date or upon any purported transfer thereof other than as expressly permitted under UAL’s amended and restated certificate of incorporation.

The Class IAM Junior Preferred Stock is deemed to rank on a parity with the Class Pilot MEC Junior Preferred Stock and senior to the UAL Common Stock as to amounts distributable upon liquidation, dissolution or winding up of UAL.

UAL’s amended and restated certificate of incorporation limits the total number of shares of equity securities held by all persons who fail to qualify as citizens of the United States to having no more than 24.9% of the voting power of all outstanding equity securities of UAL.

The ability to authorize undesignated Preferred Stock makes it possible for the Board to issue Preferred Stock with super dividend or other special rights or preferences on a discriminatory basis that could impede the success of any attempt to acquire UAL. These and other provisions may have the effect of deferring, delaying or discouraging hostile takeovers, or changes in control or management of UAL.

have continuously owned 3% or more of the outstanding shares of UAL Common Stock throughout the three-year period preceding the date of the nomination notice, and continue to own at least 3% or more of the outstanding shares of UAL Common Stock through the date of the annual meeting;

represent that such stockholder (or group) did not acquire, and is not holding, such shares of UAL Common Stock for the purpose, or with the effect, of influencing or changing control of UAL; and

provide a written notice requesting the inclusion of director nominees in UAL’s proxy materials and provide other required information to UAL not earlier than the close of business on the 150th day and not later than the close of business on the 120th day prior to the anniversary of the mailing date of UAL’s proxy statement for the prior year’s annual meeting of stockholders (with adjustments if the date for the upcoming annual meeting of stockholders is more than 30 days before or after the anniversary date of the prior year’s annual meeting).

may be issued in one or more series with the same or various maturities;

may be issued at a price of 100% of their principal amount or at a premium or discount;

may be issued in registered or bearer form and certificated or uncertificated form; and

may be represented by one or more global notes registered in the name of a designated depositary’s nominee, and if so, beneficial interests in the global note will be shown on and transfers will be made only through records maintained by the designated depositary and its participants.

(1)   the identity of the issuer of such debt securities;

(2)   the form and title of the debt securities of the series (which shall distinguish the debt securities of that particular series from the debt securities of any other series);

(3)   the price or prices of the debt securities of the series;

(4)   any limit upon the aggregate principal amount of the debt securities of the series that may be authenticated and delivered under the indenture (except for debt securities authenticated and delivered upon registration of transfer of, or in exchange for, or in lieu of, other debt securities of the series);

(5)   the date or dates on which the principal and premium with respect to the debt securities of the series are payable;

(6)   the rate or rates (which may be fixed or variable) at which the debt securities of the series shall bear interest, if any, or the method of determining such rate or rates, the date or dates from which such interest, if any, shall accrue, the interest payment dates on which such interest, if any, shall be

payable or the method by which such dates will be determined, the record dates for the determination of holders thereof to whom such interest is payable (in the case of securities in registered form), and the basis upon which such interest will be calculated if other than that of a 360-day year of twelve 30-day months;

(7)   the currency or currencies in which debt securities of the series shall be denominated, if other than U.S. dollars, the place or places, if any, in addition to or instead of the corporate trust office of the trustee (in the case of securities in registered form) or the principal New York office of the trustee (in the case of securities in bearer form), where the principal, premium and interest with respect to debt securities of the series shall be payable or the method of such payment, if by wire transfer, mail or other means;

(8)   the price or prices at which, the period or periods within which, and the terms and conditions upon which debt securities of the series may be redeemed, in whole or in part, at the issuer’s option or otherwise;

(9)   whether debt securities of the series are to be issued as securities in registered form or as securities in bearer form or both and, if securities in bearer form are to be issued, whether coupons will be attached to them, whether securities in bearer form of the series may be exchanged for securities in registered form of the series, and the circumstances under which and the places at which any such exchanges, if permitted, may be made;

(10)   if any debt securities of the series are to be issued as securities in bearer form or as one or more global securities representing individual securities in bearer form of the series, whether certain provisions for the payment of additional interest or tax redemptions shall apply; whether interest with respect to any portion of a temporary bearer security of the series payable with respect to any interest payment date prior to the exchange of such temporary bearer security for definitive securities in bearer form of the series shall be paid to any clearing organization with respect to the portion of such temporary bearer security held for its account and, in such event, the terms and conditions (including any certification requirements) upon which any such interest payment received by a clearing organization will be credited to the persons entitled to interest payable on such interest payment date; and the terms upon which a temporary security in bearer form may be exchanged for one or more definitive securities in bearer form of the series;

(11)   the issuer’s obligation, if any, to redeem, purchase or repay debt securities of the series pursuant to any sinking fund or analogous provisions or at the option of a holder of such debt securities and the price or prices at which, the period or periods within which, and the terms and conditions upon which debt securities of the series shall be redeemed, purchased or repaid, in whole or in part, pursuant to such obligations;

(12)   the terms, if any, upon which the debt securities of the series may be convertible into or exchanged for the issuer’s or UAL Common Stock, Preferred Stock, other debt securities or warrants for UAL Common Stock, Preferred Stock, indebtedness or other securities of any kind and the terms and conditions upon which such conversion or exchange shall be effected, including the initial conversion or exchange price or rate, the conversion or exchange period and any other additional provisions;

(13)   if other than denominations of $1,000 or any integral multiple thereof, the denominations in which debt securities of the series shall be issuable;

(14)   if the amount of principal, premium or interest with respect to the debt securities of the series may be determined with reference to an index or pursuant to a formula, the manner in which such amounts will be determined;

(15)   if the principal amount payable at the stated maturity of debt securities of the series will not be determinable as of any one or more dates prior to such stated maturity, the amount that will be deemed to be such principal amount as of any such date for any purpose, including the principal amount thereof which will be due and payable upon any maturity other than the stated maturity or which will

be deemed to be outstanding as of any such date (or, in any such case, the manner in which such deemed principal amount is to be determined), and if necessary, the manner of determining the equivalent thereof in U.S. dollars;

(16)   any changes or additions to the provisions of the indenture dealing with defeasance;

(17)   if other than the entire principal amount thereof, the portion of the principal amount of debt securities of the series that shall be payable upon declaration of acceleration of the maturity thereof or provable in bankruptcy;

(18)   the terms, if any, of the transfer, mortgage, pledge or assignment as security for the debt securities of the series of any properties, assets, moneys, proceeds, securities or other collateral, including whether certain provisions of the Trust Indenture Act of 1939, as amended (the “Trust Indenture Act”), are applicable and any corresponding changes to provisions of the indenture as then in effect;

(19)   any addition to or change in the events of default with respect to the debt securities of the series and any change in the right of the trustee or the holders of such series of debt securities to declare the principal, premium and interest, if any, on such series of debt securities due and payable;

(20)   if the debt securities of the series shall be issued in whole or in part in the form of a global security, the terms and conditions, if any, upon which such global security may be exchanged in whole or in part for other individual debt securities of the series in definitive registered form, the depositary (as defined in the applicable prospectus supplement) for such global security and the form of any legend or legends to be borne by any such global security in addition to or in lieu of the legend referred to in the indenture;

(21)   any trustee, authenticating agent, paying agent, transfer agent or registrar for the debt securities of the series and any office or agency of any of the foregoing for purposes of such series of debt securities;

(22)   the applicability of the covenants set forth in the indenture to the debt securities of the series, any change in such covenants or related defined terms to the extent applicable to the debt securities of the series and any additions to the covenants applicable to the debt securities of the series;

(23)   the form and terms, if any, of any guarantee of the payment of principal, premium and interest with respect to debt securities of the series, the identity of any guarantor with respect to such guarantee and any corresponding changes to the provisions of the indenture and as then in effect;

(24)   the subordination, if any, of the debt securities of the series pursuant to the indenture and any changes or additions to the provisions of the indenture then in effect relating to subordination;

(25)   with regard to debt securities of the series that do not bear interest, the dates for certain required reports to the trustee; and

(26)   any other terms of the debt securities of the series (which terms shall not be prohibited by the provisions of the indenture).

Unless otherwise provided in the applicable prospectus supplement, securities in registered form may be transferred or exchanged at the office of the trustee at which its corporate trust business is principally administered in the United States or at the office of the trustee or the trustee’s agent in the Borough of Manhattan, the City and State of New York, at which its corporate agency business is conducted, subject to the limitations provided in the indenture, without the payment of any service charge, other than any tax or governmental charge payable in connection therewith. Securities in bearer form will be transferable only by delivery. Provisions with respect to the exchange of securities in bearer form will be described in the prospectus supplement relating to those securities in bearer form.

Neither the issuer nor the registrar for the debt securities will be required (a) to issue, register the transfer of or exchange the debt securities of any series for the period beginning at the opening of business 15 days immediately preceding the mailing of a notice of redemption of the debt securities of that series selected for redemption and ending at the close of business on the day of such mailing or (b) to register

the transfer of or exchange the debt securities of any series selected, called or being called for redemption as a whole or the portion being redeemed of any such debt securities selected, called or being called for redemption in part.

(1)   any aspect of the records relating to or payments made by the depositary, its nominee or any participants on account of beneficial interests in a global security or for maintaining, supervising or reviewing any records relating to such beneficial interests;

(2)   the payment to the owners of beneficial interests in the global security of amounts paid to the depositary or its nominee; or

(3)    any other matter relating to the actions and practices of the depositary, its nominee or its participants.

The debt securities of a series may be issued as securities in registered form (which will be registered as to principal and interest in the register maintained by the registrar for such debt securities) or securities in bearer form (which will be transferable only by delivery). If such debt securities are issuable as securities in bearer form, the applicable prospectus supplement will describe certain special limitations and considerations that will apply to such debt securities.

If debt securities are issued, the indenture, as supplemented for a particular series of debt securities, will contain certain covenants for the benefit of the holders of such series of debt securities, which will be applicable (unless waived or amended) so long as any of the debt securities of such series are outstanding, unless stated otherwise in the prospectus supplement. The specific terms of the covenants, and summaries thereof, will be set forth in the prospectus supplement relating to such series of debt securities.

Debt securities of a series, and any guarantees of such securities, may be subordinated, which we refer to as subordinated debt securities, to senior indebtedness (as defined in the applicable prospectus supplement)

to the extent set forth in the prospectus supplement relating thereto. To the extent the issuer of any debt securities conducts operations through subsidiaries of such issuer, the holders of such debt securities (whether or not subordinated debt securities) will be structurally subordinated to the creditors of such subsidiaries except to the extent such subsidiary is a guarantor of such series of debt securities.

(1)   default in any payment of the principal or premium, if any, on the debt securities of that series, when such amount becomes due and payable at maturity, upon acceleration, redemption or otherwise;

(2)   failure to pay interest on any debt security of that series when such interest becomes due and payable, and such failure continues for a period of 30 days;

(3)   failure to comply for 60 days after notice with any of the covenants or agreements applicable to the debt securities of that series (other than those referred to in (1) or (2) above) or the indenture or supplemental indenture related to that series of debt securities; or

(4)   certain events of bankruptcy, insolvency or reorganization affecting the issuer.

The holders of a majority in aggregate principal amount of the debt securities of any series then outstanding may by notice to the trustee under the indenture waive any existing default or event of default and its consequences under the indenture with respect to such series of debt securities except (i) a default in the payment of the principal of (or, in the case of original issue discount debt securities of that series, the portion thereby specified in the terms thereof), premium, if any, and accrued and unpaid interest on the debt securities of such series, (ii) a default arising from the failure to redeem or purchase any debt security of that series when required pursuant to the terms of the indenture or (iii) a default in respect of a provision that cannot be amended under the indenture without the consent of each holder of the series affected.

Subject to the provisions of the indenture relating to the duties of the trustee, in case an event of default shall occur and be continuing, the trustee is under no obligation to exercise any of its rights or powers under the indenture or debt securities at the request or direction of any of the holders of any series of debt securities, unless such holders have offered to the trustee indemnity or security satisfactory to it against any loss, liability or expense. Subject to such provisions for the indemnification of the trustee, the holders of at least a majority in aggregate principal amount of the outstanding debt securities of any series have the right to direct the time, method and place of conducting any proceeding for any remedy available to the trustee or exercising any trust or power conferred on the trustee with respect to such series of debt securities. The

trustee, however, may refuse to follow any direction that conflicts with law or the indenture, that the trustee determines is unduly prejudicial to the rights of any other holder of such series of debt securities or that would subject the trustee to personal liability. Prior to taking any action under the indenture, the trustee is entitled to indemnification satisfactory to it in its sole discretion against all losses and expenses caused by taking or not taking such action.

The indenture requires the issuer with respect to an outstanding series of debt securities to furnish to the trustee, within 120 days after the end of each fiscal year, an officer’s certificate as defined in the indenture, as to whether or not such officers know of any default with respect to such series of debt securities that occurred during such period and, if so, describing the default, its status and what action the issuer is taking or proposes to take with respect thereto.

Street name and other indirect holders should consult their banks and brokers for information on their requirements for giving notice or taking other actions upon a default.

Modifications and amendments of the indenture as it applies to any series of debt securities or any of the other terms of such series may be made by the applicable issuer, any applicable guarantor and the trustee with the consent of the holders of at least a majority in aggregate principal amount of the outstanding debt securities of such series.

No such modification or amendment may, without the consent of each holder of an affected debt security:

Unless otherwise provided for in the prospectus supplement, the indenture shall cease to be of any further effect with respect to any series of debt securities if (1) either (a) the issuer has delivered to the trustee for cancellation all debt securities of such series (with certain limited exceptions) or (b) all debt securities and coupons of such series not theretofore delivered to the trustee for cancellation shall have become due and payable, are by their terms to become due and payable at their stated maturity within one year or are to be called for redemption within one year under arrangements satisfactory to the trustee for the giving of notice of redemption by the trustee in the name, and at the expense, of the issuer; and (2) the issuer shall have deposited with the trustee as trust funds an amount sufficient to pay and discharge the entire indebtedness on such debt securities not theretofore delivered to the trustee for cancellation, for principal (and premium, if any) and interest, if any, to the date of such deposit (in the case of debt securities which have become due and payable) or to the stated maturity or redemption date, as the case may be.

In addition, the issuer shall have a “legal defeasance option” ​(pursuant to which the issuer may terminate, with respect to the debt securities of a particular series, all of its obligations under such debt securities and the indenture with respect to such debt securities) and a “covenant defeasance option” (pursuant to which the issuer may terminate, with respect to the debt securities of a particular series, its obligations with respect to such debt securities under certain specified covenants with respect to such debt securities). If the legal defeasance option is exercised with respect to a series of debt securities, payment of

Upon surrender of depositary receipts representing any number of whole shares at the depositary’s office, unless the related depositary shares previously have been called for redemption, the holder of the depositary shares evidenced by the depositary receipts will be entitled to delivery of the number of whole shares of the related series of Preferred Stock and all money and other property, if any, underlying such depositary shares. However, once such an exchange is made, the Preferred Stock cannot thereafter be redeposited in exchange for depositary shares. Holders of depositary shares will be entitled to receive whole shares of the related series of Preferred Stock on the basis set forth in the applicable prospectus supplement. If the depositary receipts delivered by the holder evidence a number of depositary shares representing more than the number of whole shares of Preferred Stock of the related series to be withdrawn, the depositary will deliver to the holder at the same time a new depositary receipt evidencing the excess number of depositary shares, provided that the depositary will not issue any receipt evidencing a fractional depositary share.

Whenever UAL redeems the Preferred Stock, the depositary will redeem a number of depositary shares representing the same number of shares of Preferred Stock so redeemed. If fewer than all of the depositary shares are to be redeemed, the depositary shares to be redeemed will be selected by lot, pro rata or by any other equitable method as the depositary may determine.

Upon receipt of notice of any meeting at which the holders of the Preferred Stock of any series are entitled to vote, the depositary will mail the information contained in the notice of the meeting to the record holders of the depositary shares relating to that series of Preferred Stock. Each record holder of the depositary shares on the record date will be entitled to instruct the depositary as to the exercise of the voting rights represented by the number of shares of Preferred Stock underlying the holder’s depositary shares. The depositary will endeavor, to the extent it is practical to do so, to vote the number of whole shares of Preferred Stock underlying such depositary shares in accordance with such instructions. UAL will agree to take all reasonable actions that the depositary may deem necessary in order to enable the depositary to do so. To the extent the depositary does not receive specific instructions from the holders of depositary shares relating to such shares of Preferred Stock, it will abstain from voting such shares of Preferred Stock.

The form of depositary receipt evidencing the depositary shares and any provision of the applicable deposit agreement may at any time be amended by agreement between UAL and the depositary. With the consent of the depositary, UAL may amend the deposit agreement from time to time in any manner that it desires. However, if the amendment would materially and adversely alter the rights of the existing holders of depositary shares, the amendment would need to be approved by the holders of at least a majority of the depositary shares then outstanding.

The depositary may resign at any time by delivering to UAL notice of its election to do so. UAL may remove a depositary at any time. Any resignation or removal will take effect upon the appointment of a successor depositary and its acceptance of such appointment.

UAL will pay all transfer and other taxes and governmental charges arising solely from the existence of any depositary arrangements. UAL will pay all charges of each depositary in connection with the initial deposit of the shares of Preferred Stock of any series, the initial issuance of the depositary shares, any redemption or exchange of such shares of Preferred Stock and any withdrawals of such shares of Preferred Stock by holders of depositary shares. Holders of depositary shares will be required to pay any other transfer taxes and governmental charges.

Each depositary will forward to the holders of the applicable depositary shares all notices, reports and communications from UAL which are delivered to such depositary and which UAL is required to furnish the holders of the shares of Preferred Stock.

The deposit agreement contains provisions that limit UAL’s liability and the liability of the depositary to the holders of depositary shares. Both the depositary and UAL are also entitled to an indemnity from the holders of the depositary shares prior to bringing, or defending against, any legal proceeding pertaining to the rights of the holders of the depositary shares. UAL or any depositary may rely upon written advice of counsel or accountants, or information provided by persons presenting shares of Preferred Stock for deposit, holders of depositary shares or other persons believed by UAL or it to be competent and on documents believed by UAL or them to be genuine.

UAL may issue warrants for the purchase of debt securities, UAL Common Stock or Preferred Stock. Warrants may be issued independently or together with debt securities, UAL Common Stock or Preferred Stock offered by any prospectus supplement and may be attached to or separate from any such offered securities. Each series of warrants will be issued under a separate warrant agreement to be entered into between UAL and a bank or trust company, as warrant agent. The warrant agent will act solely as UAL’s agent in connection with the warrants and will not assume any obligation or relationship of agency or trust for or with any holders or beneficial owners of warrants.

The prospectus supplement relating to a particular issue of debt warrants will describe the terms of such debt warrants, including the following: (a) the title of such debt warrants; (b) the offering price for such debt warrants, if any; (c) the aggregate number of such debt warrants; (d) the designation and terms of the debt securities purchasable upon exercise of such debt warrants; (e) if applicable, the designation and terms of the debt securities with which such debt warrants are issued and the number of such debt warrants issued with each such debt security; (f) if applicable, the date from and after which such debt warrants and any debt securities issued therewith will be separately transferable; (g) the principal amount of debt securities purchasable upon exercise of a debt warrant and the price at which such principal amount of debt securities may be purchased upon exercise (which price may be payable in cash, securities, or other property); (h) the date on which the right to exercise such debt warrants shall commence and the date on which such right shall expire; (i) if applicable, the minimum or maximum amount of such debt warrants that may be exercised at any one time; (j) whether the debt warrants represented by the debt warrant certificates or debt securities that may be issued upon exercise of the debt warrants will be issued in registered or bearer form; (k) information with respect to book-entry procedures, if any; (l) the currency or currency units in which the offering price, if any, and the exercise price are payable; (m) the anti-dilution provisions of such debt warrants, if any; (n) the redemption or call provisions, if any, applicable to such debt warrants; and (o) any additional terms of such debt warrants, including terms, procedures and limitations relating to the exchange and exercise of such debt warrants.

The prospectus supplement relating to any particular issue of UAL Common Stock warrants or Preferred Stock warrants will describe the terms of such warrants, including the following: (a) the title of such warrants; (b) the offering price for such warrants, if any; (c) the aggregate number of such warrants; (d) the designation and terms of the UAL Common Stock or Preferred Stock purchasable upon exercise of such warrants; (e) if applicable, the designation and terms of the offered securities with which such warrants are issued and the number of such warrants issued with each such offered security; (f) if applicable, the date from and after which such warrants and any offered securities issued therewith will be separately transferable; (g) the number of shares of UAL Common Stock or Preferred Stock purchasable upon exercise of a warrant and the price at which such shares may be purchased upon exercise; (h) the date on which the right to exercise such warrants shall commence and the date on which such right shall expire; (i) if applicable, the minimum or maximum amount of such warrants that may be exercised at any one time; (j) the currency or currency units in which the offering price, if any, and the exercise price are payable; (k) the anti-dilution provisions of such warrants, if any; (l) the redemption or call provisions, if any, applicable to such warrants; and (m) any additional terms of such warrants, including terms, procedures and limitations relating to the exchange and exercise of such warrants.

to or through underwriters;

through brokers or dealers;

directly by us or any selling security holders to purchasers, including through a specific bidding, auction or other process; or

through a combination of any of these methods of sale.

purchases of the securities by a broker-dealer as principal and resales of the securities by the broker-dealer for its account pursuant to this prospectus;

ordinary brokerage transactions; or

transactions in which the broker-dealer solicits purchasers.