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As of December 31, 2023, Sun Country Airlines Holdings, Inc. (“Sun Country”, the “Company,” “we,” “us” and “our”) had one class of securities registered under Section 12 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”): common stock, par value $0.01 per share. The following description of Sun Country’s capital stock summarizes certain material terms of our amended and restated certificate of incorporation (the “certificate of incorporation”) and amended and restated bylaws (the “bylaws”) and of specific provisions of Delaware law. The following description is intended as a summary only and is qualified in its entirety by reference to our certificate of incorporation and our bylaws, copies of which have been filed as exhibits to this Annual Report on Form 10-K, and the Delaware General Corporation Law, or the DGCL. Defined terms used herein, but otherwise not defined shall have the meaning ascribed to them in this Annual Report on Form 10-K.

Other Matters. Holders of our common stock have no preemptive or conversion rights, and our common stock is not subject to further calls or assessments by us. There are no redemption or sinking fund provisions applicable to our common stock. The rights, powers, preferences and privileges of holders of our common stock will be subject to those of the holders of any shares of our preferred stock that we may designate and issue in the future.

Pursuant to our certificate of incorporation, shares of preferred stock are issuable from time to time, in one or more series, with the designations, voting rights (full, limited or no voting rights), powers, preferences, participating, optional or other special rights (if any), and any qualifications, limitations or restrictions thereof, of each series as our board of directors from time to time may adopt by resolution (and without further stockholder approval). Each series of preferred stock will consist of an authorized number of shares as will be stated and expressed in the certificate of designations providing for the creation of the series.

In connection with the ATSA, we issued warrants (the “2019 Warrants”) to purchase an aggregate of 9,482,606 shares of SCA common stock at an exercise price of approximately $15.17 per share to Amazon. In connection with the Reorganization Transactions, the 2019 Warrants were converted into warrants to purchase an aggregate of 9,482,606 shares of our common stock and the exercise price remained unchanged. 1.0% of the 2019 Warrants vested upon issuance of the warrants and incremental tranches vest upon certain milestones of aggregate global payments by Amazon to the Company or its affiliates pursuant to the ATSA up to a total of $1.12 billion of aggregate payments. As of December 31, 2023, approximately 25.3% of the 2019 Warrants were vested. Any unvested 2019 Warrants will become vested upon a change of control (as defined in the 2019 Warrant) or certain transfers of 30% or more of the voting power in the Company to a new person or group (other than any equity offering by the Company or the Apollo Stockholder pursuant to an effective registration statement so long as no person or group (within the meaning of the Exchange Act) acquires more than 50% of the voting power of the Company in such offering). Vested 2019 Warrants may be exercised until the eighth anniversary of the issue date.

In the event we or our equityholders propose to initiate a process to explore, enter into negotiations or accept any offer with respect to a change of control of the Company, we are required to provide Amazon at least 30 days’ written notice prior to entering into any definitive agreement or binding letter of intent. In addition, Amazon will have the right to enter into non-exclusive, good faith negotiations with us and our equityholders with respect to such proposed change of control and we will not be permitted to enter into any definitive or binding agreement before the expiration of the 30-day period, which period may be extended under certain circumstances.

In accordance with our certificate of incorporation and our bylaws, the number of directors comprising our board of directors is determined from time to time exclusively by our board of directors; provided that the number of directors shall not be less than three and shall not exceed 15. Our certificate of incorporation provides for a board of directors divided into three classes (each as nearly as equal as possible and with directors in each class serving staggered three-year terms), currently consisting of three directors in Class I, two directors in Class II and three directors in Class III. See “—Certain Corporate Anti-takeover Provisions—Classified Board of Directors.”

Under our Stockholders Agreement, the Apollo Stockholder has the right, but not the obligation, at any time until Apollo and its affiliates, including the Apollo Stockholder, no longer beneficially own at least 5% of our issued and outstanding common stock, to nominate a number of directors comprising a percentage of our board of directors in accordance with their beneficial ownership of our outstanding common stock (rounded up to the nearest whole number), except that if Apollo and its affiliates, including the Apollo Stockholder, beneficially own more than 50% of the voting power of our outstanding common stock, the Apollo Stockholder will have the right to nominate a majority of the directors. We refer to the directors nominated by the Apollo Stockholder based on such percentage ownership as the “Apollo Directors.”

For so long as Amazon holds the 2019 Warrants or any shares of common stock issued upon exercise of the 2019 Warrants and the ATSA remains in effect, Amazon will have the right to nominate a member or an observer to our board of directors. We refer to the director nominated by Amazon, if any, as the “Amazon Director.” As of the date of this prospectus, Amazon has not exercised its right to nominate a member or an observer to our board of directors.

Each director is to hold office for a three year term and until the annual meeting of stockholders for the election of the class of directors to which such director has been elected and until his or her successor is duly elected and qualified or until his or her earlier death, resignation or removal. Any vacancy on our board of directors (other than in respect of an Apollo Director or an Amazon Director) will be filled only by the affirmative vote of a majority of the remaining directors, even if less than a quorum. Any vacancy on our board of directors in respect of an Apollo Director will be filled only by individuals designated by the Apollo Stockholder, for so long as Apollo and its affiliates, including the Apollo Stockholder, beneficially own at least 5% of our issued and outstanding common stock, and any vacancy in respect of an Amazon Director shall only be filled by Amazon.

At any meeting of our board of directors, except as otherwise required by law, a majority of the total number of directors then in office will constitute a quorum for all purposes, except that if Apollo and its affiliates, including the Apollo Stockholder, beneficially own at least 5% of our issued and outstanding common stock and there is at least one member of our board of directors who is an Apollo Director, then at least one director that is an Apollo Director must be present for there to be a quorum unless each Apollo Director waives his or her right to be included in the quorum at such meeting.

Our certificate of incorporation contains provisions that permit our board of directors to issue, without any further vote or action by stockholders, shares of preferred stock in one or more series and, with respect to each such series, to fix the number of shares constituting the series and the designation of the series, the voting rights (if any) of the shares of the series, the powers, preference, participating, optional or other special rights, if any, and any qualifications, limitations or restrictions, of the shares of such series.

Our certificate of incorporation provides that our board of directors will be divided into three classes of directors, with the classes to be as nearly equal in number as possible, and with the directors in each class serving staggered three-year terms. As a result, approximately one-third of our board of directors will be elected each year. The classification of directors will have the effect of making it more difficult for stockholders to change the composition of our board of directors. Our certificate of incorporation provides that, subject to any rights of holders of preferred stock to elect additional directors under specified circumstances, the number of directors will be fixed from time to time exclusively pursuant to a resolution adopted by our board of directors, as described above in “—Composition of Board of Directors; Election and Removal.”

Under the DGCL, unless otherwise provided in our certificate of incorporation, directors serving on a classified board may be removed by the stockholders only for cause. Our certificate of incorporation provides that directors may be removed with or without cause upon the affirmative vote of a majority in voting power of all outstanding shares of stock entitled to vote thereon, voting together as a single class; provided, however, that (i) from and after the time Apollo and its affiliates, including the Apollo Stockholder, cease to beneficially own, in the aggregate, at least 50.1% of the voting power of our outstanding common stock, directors may only be removed for cause, and only by the affirmative vote of holders of at least 66 2/3% in voting power of all the then-outstanding shares of stock of the Company entitled to vote thereon, voting together as a single class and (ii) Amazon must consent to the removal of any Amazon Director. Any vacancy on our board of directors in respect of an Apollo Director shall only be filled by the Apollo Stockholder and any vacancy on our board of directors in respect of an Amazon Director shall only be filled by Amazon. Any other vacancy on our board of directors will be filled only by the affirmative vote of a majority of the remaining directors, even if less than a quorum, as described above in “— Composition of Board of Directors; Election and Removal.”

Our certificate of incorporation provides that if less than 50.1% of the voting power of our outstanding common stock is beneficially owned by Apollo and its affiliates, including the Apollo Stockholder, special meetings of the stockholders may be called only by the chairman of the board of directors or by the secretary at the direction of a majority of the directors then in office. For so long as at least 50.1% of the voting power of our outstanding common stock is beneficially owned by Apollo and its affiliates, including the Apollo Stockholder, special meetings may also be called by the secretary at the written request of the holders of a majority of the voting power of the then outstanding common stock. The business transacted at any special meeting will be limited to the proposal or proposals included in the notice of the meeting.

Subject to the rights of the holders of one or more series of our preferred stock then outstanding, any action required or permitted to be taken by stockholders must be effected at a duly called annual or special meeting of our stockholders; provided, that prior to the time at which Apollo and its affiliates, including the Apollo Stockholder, cease to beneficially own at least 50.1% of the voting power our outstanding common stock, any action required or permitted to be taken at any annual or special meeting of our 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 or on behalf of 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 entitled to vote thereon were present and voted and are delivered in accordance with applicable Delaware law.

Our bylaws provide that stockholders who are seeking to bring business before an annual meeting of stockholders and stockholders who are seeking to nominate candidates for election as directors at an annual meeting of stockholders, other than any nomination for an Amazon Director or an Apollo Director, must provide timely notice thereof in writing. To be timely, a stockholder’s notice generally must be delivered to and received at our principal executive offices not less than 90 days nor more than 120 days prior to the first anniversary of the preceding year’s annual meeting of stockholders; provided, that in the event that the date of such meeting is advanced by more than 30 days prior to, or delayed by more than 60 days after, the anniversary of the preceding year’s annual meeting of our stockholders, a stockholder’s notice to be timely must be so delivered not earlier than the close of business on the 120th day prior to such meeting and not later than the close of business on the 90th day prior to such meeting or, if the first public announcement of the date of such meeting is less than 100 days prior to the date of such annual meeting, the 10th day following the day on which public announcement of the date of such meeting is first made. Our bylaws specify certain requirements as to the form and content of a stockholder’s notice.

All of the foregoing provisions of our certificate of incorporation and bylaws could discourage potential acquisition proposals and could delay or prevent a change in control. These provisions are intended to enhance the likelihood of continuity and stability in the composition of the board of directors and in the policies formulated by the board of directors and to discourage certain types of transactions that may involve an actual or threatened change in control. These same provisions may delay, deter or prevent a tender offer or takeover attempt that a stockholder might consider to be in its best interest. In addition, such provisions could have the effect of discouraging others from making tender offers for our shares and, as a consequence, they also may inhibit fluctuations in the market price of our common stock that could result from actual or rumored takeover attempts. Such provisions also may have the effect of preventing changes in our management.

However, our certificate of incorporation includes a provision that restricts us from engaging in any business combination with an interested stockholder for three years following the date that person becomes an interested stockholder. Such restrictions shall not apply to any business combination between Apollo and any affiliate thereof, including the Apollo Funds and the Apollo Stockholder, or their direct and indirect transferees, on the one hand, and us, on the other. In addition, such restrictions will not apply if:

•a stockholder becomes an interested stockholder inadvertently and (i) as soon as practicable divests itself of ownership of sufficient shares so that it ceases to be an interested stockholder and (ii) within the three-year period immediately prior to the business combination between the Company and such stockholder, would not have been an interested stockholder but for the inadvertent acquisition of ownership; or

•the business combination is proposed prior to the consummation or abandonment of, and subsequent to the earlier of the public announcement or the notice required under the certificate of incorporation of, a proposed transaction that (i) constitutes one of the transactions described in the proviso of this sentence, (ii) is with or by a person who either was not an interested stockholder during the previous three years or who became an interested stockholder with the approval of our board of directors and (iii) is approved or not opposed by a majority of the directors then in office (but not less than one) who were directors prior to any person becoming an interested stockholder during the previous three years or were recommended for election or elected to succeed such directors by a majority of such directors; provided that the proposed transactions are limited to (x) a merger or consolidation of the Company (except for a merger in respect of which, pursuant to Section 251(f) of the DGCL, no vote of the stockholders of the Company is required), (y) a sale, lease, exchange, mortgage, whether as part of a dissolution or otherwise, of assets of the Company or of any direct or indirect majority-owned subsidiary of the Company (other than to any wholly owned subsidiary or to the Company) having an aggregate market value equal to 50% or more of either that aggregate market value of all the assets of the Company determined on a consolidated basis or the aggregate market value of all the outstanding stock of the Company or (z) a proposed tender or exchange offer for 50% or more of the outstanding voting stock of the Company; provided further that the Company will give not less than 20 days’ notice to all interested stockholders prior to the consummation of any of the transactions described in clause (x) or (y) above. Additionally, we would be able to enter into a business combination with an interested stockholder if:

•upon consummation of the transaction that resulted in the interested stockholder becoming an interested stockholder, the interested stockholder owned at least 85% of our voting stock outstanding at the time the transaction commenced, excluding for purposes of determining the voting stock outstanding (but not the outstanding voting stock owned by the interested stockholder) stock held by directors who are also officers of our Company and by employee stock plans that do not provide employees with the right to determine confidentially whether shares held under the plan will be tendered in a tender or exchange offer; or

In general, a “business combination” is defined to include mergers, asset sales and other transactions resulting in financial benefit to a stockholder and an “interested stockholder” is any person who, together with affiliates and associates, is the owner of 15% or more of our outstanding voting stock or is our affiliate or associate and was the owner of 15% or more of our outstanding voting stock at any time within the three-year period immediately before the date of determination. Under our certificate of incorporation, an “interested stockholder” generally does not include Apollo and any affiliate thereof or their direct and indirect transferees.

Notwithstanding the foregoing, our certificate of incorporation provides that, from and after the time Apollo and its affiliates, including the Apollo Stockholder, cease to beneficially own at least 50.1% of the voting power of our outstanding common stock, in addition to any vote required by applicable law, our certificate of incorporation or bylaws, the affirmative vote of holders of at least 66 2/3% of the voting power of our outstanding shares of our capital stock entitled to vote thereon, voting together as a single class, is required to alter, amend or repeal the following provisions of our certificate of incorporation:

•the provisions providing for a classified board of directors and the number of the directors, establishing the term of office of directors, setting forth the quorum of any meeting of the board of directors, relating to the removal of directors, specifying the manner in which vacancies on the board of directors and newly created directorships may be filled and relating to any voting rights of preferred stock;

Our bylaws provide that they can be amended by the vote of the holders of shares constituting a majority of the voting power or by the vote of a majority of the board of directors. However, our certificate of incorporation provides that, from and after the time Apollo and its affiliates, including the Apollo Stockholder, cease to beneficially own at least 50.1% of the voting power of our outstanding common stock, in addition to any vote required under our certificate of incorporation, the affirmative vote of the holders of at least 66 2/3% of the voting power of the outstanding shares of stock entitled to vote thereon, voting as a single class, is required for the stockholders to alter, amend or repeal any provision of our bylaws or to adopt any provision inconsistent therewith.

•merging or consolidating with or into any other entity, or transferring (by lease, assignment, sale or otherwise) all or substantially all of the Company’s and our subsidiaries’ assets, taken as a whole, to another entity, or enter into or agree to undertake any other transaction that would constitute a “change of control” as defined in the Stockholders Agreement (other than, in each case, transactions among the Company and our wholly-owned subsidiaries).

The provisions of the DGCL, our certificate of incorporation, our bylaws and our Stockholders Agreement could have the effect of discouraging others from attempting hostile takeovers and, as a consequence, they may also inhibit temporary fluctuations in the market price of our common stock that often result from actual or rumored hostile takeover attempts. These provisions may also have the effect of preventing changes in our management. It is possible that these provisions could make it more difficult to accomplish transactions that stockholders may otherwise deem to be in their best interests.

To comply with restrictions imposed by federal law on foreign ownership and control of U.S. airlines, our certificate of incorporation and bylaws restrict ownership and control of shares of our common stock by non-U.S. citizens. The restrictions imposed by federal law and DOT policy require that we be owned and controlled by U.S. citizens, that no more than 25% of our voting stock be owned or controlled, directly or indirectly, by persons or entities who are not U.S. citizens, as defined in 49 U.S.C. § 40102(a)(15), that no more than 49% of our stock be owned or controlled, directly or indirectly, by persons or entities who are not U.S. citizens and are from countries that have entered into “open skies” air transport agreements with the United States, that our president and at least two-thirds of the members of our board of directors and other managing officers be U.S. citizens and that we be under the actual control of U.S. citizens. Our certificate of incorporation and bylaws provide that the failure of non-U.S. citizens to register their shares on a separate stock record, which we refer to as the “foreign stock record,” would result in a loss of their voting rights in the event and to the extent that the aggregate foreign ownership of the outstanding common stock exceeds the foreign ownership restrictions imposed by federal law. Our bylaws further provide that no shares of our common stock will be registered on the foreign stock record if the amount so registered would exceed the foreign ownership restrictions imposed by federal law. If it is determined that the amount registered in the foreign stock record exceeds the foreign ownership restrictions imposed by federal law, shares will be removed from the foreign stock record, resulting in the loss of voting rights, in reverse chronological order based on the date of registration therein, until the number of shares registered therein does not exceed the foreign ownership restrictions imposed by federal law. We are currently in compliance with these ownership restrictions.

Notwithstanding the foregoing, the provisions of the foregoing paragraph will not apply to suits brought to enforce any liability or duty created by the Securities Act, the Exchange Act or any other claim for which the federal district courts of the United States have exclusive jurisdiction. For instance, the provision would not apply to actions arising under federal securities laws, including suits brought to enforce any liability or duty created by the Securities Act, Exchange Act or the rules and regulations thereunder. Our certificate of incorporation further provides that the federal district courts of the United States shall, to the fullest extent permitted by law, be the sole and exclusive forum for the resolution of any action, suit or proceeding asserting a cause of action arising under the Securities Act. Any person or entity purchasing or otherwise acquiring any interest in any shares of our capital stock will be deemed to have notice of and, to the fullest extent permitted by law, to have consented to the foregoing forum selection provisions. However, the enforceability of similar forum provisions in other companies’ certificates of incorporation has been challenged in legal proceedings, and it is possible that a court could find these types of provisions to be unenforceable.

We recognize that the forum selection clause in our certificate of incorporation may impose additional litigation costs on stockholders in pursuing any such claims, particularly if the stockholders do not reside in or near the State of Delaware. Additionally, the forum selection clause in our certificate of incorporation may limit our stockholders’ ability to bring a claim in a forum that they find favorable for disputes with us or our directors, officers or employees, which may discourage such lawsuits against us and our directors, officers and employees even though an action, if successful, might benefit our stockholders. Alternatively, if a court were to find the choice of forum provision contained in our certificate of incorporation to be inapplicable or unenforceable in an action, we may incur additional costs associated with resolving such action in other jurisdictions. The Court of Chancery of the State of Delaware and the federal district courts of the United States may also reach different judgments or results than would other courts, including courts where a stockholder considering an action may be located or would otherwise choose to bring the action, and such judgments may be more or less favorable to us than our stockholders.