Mesa Air (MESA) S-3 Shelf registration

Exhibit 4.3

Execution Version

REGISTRATION RIGHTS AGREEMENT

This REGISTRATION RIGHTS AGREEMENT (this “Agreement”), dated as of March 6, 2023, is by and among Mesa Air Group, Inc., a Nevada corporation (the “Company”), United Airlines, Inc., a Delaware corporation (the “Investor”), and the other Holders (as defined below) from time to time parties hereto.

RECITALS:

WHEREAS, on December 27, 2022, the Company, Mesa Airlines, Inc., a Nevada corporation, and Investor entered into that certain Third Amended and Restated Capacity Purchase Agreement (“A&R CPA”), pursuant to which, among other matters, as part of the consideration of, and as a material inducement to the Investor to execute and deliver the A&R CPA, Issuer agreed to issue to the Investor 4,042,061 shares (the “Issued Shares”) of the Issuer’s common stock, no par value per share (the “Common Stock”), and to grant certain registration rights to the Investor, in each case as contemplated by the terms set forth in Exhibit R to the A&R CPA; and

WHEREAS, in connection with the closing of the transactions contemplated by the A&R CPA, the Company is granting to the Investor and the other Holders from time to time parties hereto, certain registration rights with respect to the Issued Shares, as set forth in this Agreement.

NOW THEREFORE, in consideration of the mutual covenants and agreements set forth herein and for good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged by each party hereto, the parties hereby agree as follows:

ARTICLE I

DEFINITIONS

As used herein, the following terms shall have the following respective meanings:

“A&R CPA” has the meaning set forth in the recitals.

“Adoption Agreement” means an Adoption Agreement in the form attached hereto as Exhibit A.

“Affiliate” means (a) as to any Person, other than an individual Holder, any other Person who directly, or indirectly through one or more intermediaries, controls, is controlled by or is under common control with such Person and (b) as to any individual, (i) any Relative of such individual, (ii) any trust whose primary beneficiaries are one or more of such individual and such individual’s Relatives, (iii) the legal representative or guardian of such individual or any of such individual’s Relatives if one has been appointed and (iv) any Person controlled by one or more of such individual or any Person referred to in clauses (i), (ii) or (iii) above. As used in this Agreement, the term “control,” including the correlative terms “controlling,” “controlled by” and “under common control with,” means possession, directly or indirectly, of the power to direct or cause the direction of management or policies (whether through ownership of securities or any partnership or other ownership interest, by contract or otherwise) of a Person. For the avoidance of doubt, for purposes of this Agreement, the Company, on the one hand, and the Holders, on the other hand, shall not be considered Affiliates.

“Agreement” has the meaning set forth in the introductory paragraph.

“Board” means the board of directors of the Company.

“Business Day” means any day other than a Saturday, Sunday, any federal holiday or any other day on which banking institutions in the State of Texas or the State of New York are authorized or required to be closed by law or governmental action.

“Commission” means the Securities and Exchange Commission or any successor governmental agency.

“Common Stock” has the meaning set forth in the recitals.

“Company” has the meaning set forth in the introductory paragraph.

“Company Securities” has the meaning set forth in Section 2.4(c)(i).

“Exchange Act” means the Securities Exchange Act of 1934, as amended, or any successor federal statute, and the rules and regulations of the Commission thereunder, all as the same shall be in effect at the time.

“Holder” means any record holder of Registrable Securities.

“Holders Securities” has the meaning set forth in Section 2.2(c)(i).

“Indemnified Party” has the meaning set forth in Section 3.3.

“Indemnifying Party” has the meaning set forth in Section 3.3.

“Investor” has the meaning set forth in the introductory paragraph.

“Issued Shares” has the meaning set forth in the recitals.

“Losses” has the meaning set forth in Section 3.1.

“Majority Holders” shall mean, at any time, the Holder or Holders of more than fifty percent (50%) of the Registrable Securities at such time.

“Managing Underwriter” means, with respect to any Underwritten Offering, the lead book-running manager(s) of such Underwritten Offering.

“Opt-Out Notice” has the meaning set forth in Section 2.4(b).

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“Permitted Transferee” of a Holder means (i) any Affiliate of the Holder or (ii) any direct or indirect partner, shareholder or member of the Holder or any trust, family partnership or family limited liability company, the sole direct or indirect beneficiaries, partners or members of which are the Holder or Relatives of the Holder.

“Person” means any individual, corporation, partnership, limited liability company, firm, association, trust, government, governmental agency or other entity, whether acting in an individual, fiduciary or other capacity.

“Piggyback Underwritten Offering” has the meaning set forth in Section 2.4(a).

“Piggybacking Holder” has the meaning set forth in Section 2.4(a).

“Proceeding” shall mean an action, claim, suit, arbitration or proceeding (including, without limitation, an investigation or partial proceeding, such as a deposition), whether commenced or threatened.

“Registrable Securities” or “Registrable Security” shall mean (a) the Issued Shares and (b) any securities issued or issuable with respect to the Issued Shares by way of distribution, dividend, stock split or in connection with any reorganization or other recapitalization, merger, exchange, consolidation or otherwise; provided, however, that a Registrable Security shall cease to be a Registrable Security when (i) such share has been disposed of pursuant to an effective Registration Statement, (ii) such share has been disposed of under Rule 144 or any other exemption from the registration requirements of the Securities Act as a result of which the Transferee thereof does not receive “restricted securities” as defined in Rule 144 under the Securities Act or (iii) such shares are freely tradeable by the Holder thereof without volume, manner of sale or other limitations or requirements under Rule 144 (including the current public information requirement of Rule 144(e)) and such Holder and its Affiliates collectively hold less than 5% of the outstanding shares of Common Stock.

“Registration Expenses” means all expenses incurred by the Company in complying with Article II, including, without limitation, all registration and filing fees, printing expenses, road show expenses, fees and disbursements of counsel and independent public accountants for the Company, fees and expenses (including counsel fees) incurred in connection with complying with state securities or “blue sky” laws, fees of the Financial Industry Regulatory Authority, Inc., fees of transfer agents and registrars, and the reasonable fees and disbursements of one special legal counsel to represent the Investor in an applicable Shelf Underwritten Offering or Piggyback Underwritten Offering not to exceed $25,000 per Shelf Underwritten Offering or Piggyback Underwritten Offering, but excluding any Selling Expenses.

“Registration Statement” means any registration statement of the Company filed or to be filed with the Commission under the Securities Act, including the related prospectus, amendments and supplements to such registration statement, and including pre- and post-effective amendments, and all exhibits and all material incorporated by reference in such registration statement.

“Relative” means, with respect to any natural person: (a) such natural person’s spouse, (b) any lineal descendant, parent, grandparent, great grandparent or sibling or any lineal descendant of such sibling (in each case whether by blood or legal adoption), and (c) the spouse of a natural person described in clause (b) of this definition.

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“Requesting Holder” has the meaning set forth in Section 2.2(a).

“Required Shelf Filing Date” means the 10th Business Day after the date of this Agreement.

“Rule 144” means Rule 144 promulgated by the Commission pursuant to the Securities Act, as such rule may be amended from time to time, or any similar rule or regulation hereafter adopted by the Commission as a replacement thereto having substantially the same effect as such rule.

“Section 2.2 Maximum Number of Shares” has the meaning set forth in Section 2.2(c).

“Securities Act” means the Securities Act of 1933, as amended, or any successor federal statute, and the rules and regulations of the Commission thereunder, all as the same shall be in effect at the time. References to any rule under the Securities Act shall be deemed to refer to any similar or successor rule or regulation.

“Selling Expenses” means all (a) underwriting fees, discounts and selling commissions allocable to the sale of Registrable Securities, (b) transfer taxes allocable to the sale of the Registrable Securities and (c) costs or expenses related to any roadshows conducted in connection with the marketing of any Shelf Underwritten Offering.

“Selling Holder” means a Holder selling Registrable Securities pursuant to a Registration Statement.

“Shelf Piggybacking Holder” has the meaning set forth in Section 2.2(b).

“Shelf Registration Statement” has the meaning set forth in Section 2.1(a).

“Shelf Underwritten Offering” has the meaning set forth in Section 2.2(a).

“Shelf Underwritten Offering Request” has the meaning set forth in Section 2.2(a).

“Suspension Period” has the meaning set forth in Section 2.3.

“Transfer” means any offer, sale, pledge, encumbrance, hypothecation, entry into any contract to sell, grant of an option to purchase, short sale, assignment, transfer, exchange, gift, bequest or other disposition, direct or indirect, in whole or in part, by operation of law or otherwise. “Transfer,” when used as a verb, and “Transferee” and “Transferor” have correlative meanings.

“Underwritten Offering” means an offering (including an offering pursuant to a Shelf Registration Statement) in which shares of Common Stock are sold to an underwriter for reoffer.

“Underwritten Offering Filing” means (a) with respect to a Shelf Underwritten Offering, a preliminary prospectus supplement (or prospectus supplement if no preliminary prospectus

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supplement is used) to the Shelf Registration Statement relating to such Shelf Underwritten Offering, and (b) with respect to a Piggyback Underwritten Offering, (i) a preliminary prospectus supplement (or prospectus supplement if no preliminary prospectus supplement is used) to an effective Shelf Registration Statement (other than the Shelf Registration Statement) or (ii) a Registration Statement, in each case relating to such Piggyback Underwritten Offering.

ARTICLE II

REGISTRATION RIGHTS

Section 2.1 Shelf Registration.

(a) As soon as practicable, and in any event on or prior to the Required Shelf Filing Date, the Company shall prepare and file a “shelf” registration statement under the Securities Act to permit the resale of the Registrable Securities from time to time as permitted by Rule 415 under the Securities Act (or any similar provision adopted by the Commission then in effect) (the “Shelf Registration Statement”). The Company shall use its commercially reasonable efforts to cause such Registration Statement to become or be declared effective as soon as practicable after the filing thereof and, in any event, within 45 days after the date of this Agreement in the case of a Shelf Registration Statement on Form S-3 or 90 days after the date of this Agreement in the case of a Shelf Registration Statement on Form S-1. Following the effective date of the Shelf Registration Statement, the Company shall notify the Holders of the effectiveness of such Registration Statement.

(b) The Shelf Registration Statement shall be on Form S-3 or, if Form S-3 is not then available to the Company, on Form S-1 or such other form of registration statement as is then available to effect a registration for resale of such Registrable Securities and shall contain a prospectus in such form as to permit any Holder to sell such Registrable Securities pursuant to Rule 415 under the Securities Act (or any successor or similar rule adopted by the Commission then in effect) at any time beginning on the effective date for such Registration Statement. The Shelf Registration Statement shall provide for the distribution or resale pursuant to any method or combination of methods legally available to the Holders.

(c) The Company shall use its commercially reasonable efforts to cause the Shelf Registration Statement to remain effective, and to be supplemented and amended as promptly as practicable to the extent necessary to ensure that the Shelf Registration Statement is available or, if not available, that another Registration Statement is available (which Registration Statement shall also be referred to herein as the Shelf Registration Statement), for the resale of all the Registrable Securities until all of the Registrable Securities have ceased to be Registrable Securities or the earlier termination of this Agreement (as to all Holders).

(d) When effective, the Shelf Registration Statement (including the documents incorporated therein by reference) will comply as to form in all material respects with all applicable requirements of the Securities Act and the Exchange Act and will not contain an untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary to make the statements therein not misleading (in the case of any prospectus contained in the Shelf Registration Statement, in the light of the circumstances under which such statements are made).

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Section 2.2 Underwritten Shelf Offering Requests.

(a) In the event that any Holder or group of Holders elects to dispose of Registrable Securities under a Registration Statement pursuant to an Underwritten Offering and reasonably expects gross proceeds of at least $2,000,000 from such Underwritten Offering (including proceeds attributable to any Registrable Securities included in such Underwritten Offering by any Shelf Piggybacking Holders), the Company shall, at the request (a “Shelf Underwritten Offering Request”) of such Holder or Holders (in such capacity, a “Requesting Holder”), enter into an underwriting agreement in a form as is customary in Underwritten Offerings of securities by the Company with the underwriter or underwriters selected by the Requesting Holders holding a majority of the shares of Common Stock expected to be sold in such Underwritten Offering (and reasonably acceptable to the Company) and shall take all such other reasonable actions as are requested by the Managing Underwriter of such Underwritten Offering and/or the Requesting Holders in order to expedite or facilitate the disposition of such Registrable Securities and, subject to Section 2.2(c), the Registrable Securities requested to be included by any Shelf Piggybacking Holder (a “Shelf Underwritten Offering”); provided, however, that in the event any Holder or group of Holders elects to dispose of an amount of Registrable Securities equal to or greater than 25% of the number of Issued Shares under a Registration Statement pursuant to an Underwritten Offering, then such Underwritten Offering shall not be subject to any restriction on expected gross proceeds set forth in this Section 2.2(a).

(b) If the Company receives a Shelf Underwritten Offering Request, it will give written notice of such proposed Shelf Underwritten Offering to each Holder (other than the Requesting Holder), which notice shall include the anticipated filing date of the related Underwritten Offering Filing and, if known, the number of shares of Common Stock that are proposed to be included in such Shelf Underwritten Offering, and of such Holders’ rights under this Section 2.2(b). Such notice shall be given promptly (and in any event not later than two Business Days following receipt of the Shelf Underwritten Offering Request); provided, that if the Shelf Underwritten Offering is a bought or overnight Underwritten Offering and the Managing Underwriter advises the Company and the Requesting Holder that the giving of notice pursuant to this Section 2.2(b) would adversely affect the offering, no such notice shall be required (and such Holders shall have no right to include Registrable Securities in such bought or overnight Underwritten Offering); and provided further, that the Company shall not so notify any such other Holder that has notified the Company (and not revoked such notice) requesting that such Holder not receive notice from the Company of any proposed Shelf Underwritten Offering. If such notice is delivered pursuant to this Section 2.2(b), each such Holder shall then have four Business Days (or one Business Day in the case of a bought or overnight Underwritten Offering) after the date on which the Holders received notice pursuant to this Section 2.2(b) to request inclusion of Registrable Securities in the Shelf Underwritten Offering (which request shall specify the maximum number of Registrable Securities intended to be disposed of by such Holder and such other information as is reasonably required to effect the inclusion of such Registrable Securities) (any such Holder making such request, a “Shelf Piggybacking Holder”). If no request for inclusion from a Holder is received within such period, such Holder shall have no further right to participate in such Shelf Underwritten Offering.

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(c) If the Managing Underwriter of the Shelf Underwritten Offering shall inform the Requesting Holder of its belief that the number of Registrable Securities requested to be included in such Shelf Underwritten Offering by the Holders (and any other shares of Common Stock requested to be included by any other Persons having registration rights with respect to such offering) would materially adversely affect such offering, then the Company shall include in the applicable Underwritten Offering Filing, to the extent of the total number of Registrable Securities that the Company is so advised can be sold in such Shelf Underwritten Offering without so materially adversely affecting such offering (the “Section 2.2 Maximum Number of Shares”), Registrable Securities in the following priority:

(i) First, all Registrable Securities that the Holders requested to be included therein (the “Holders Securities”) (pro rata among the Holders based on the number of Registrable Securities each requested to be included), and

(ii) Second, to the extent that the number of Holders Securities is less than the Section 2.2 Maximum Number of Shares, the shares of Common Stock requested to be included by any other Persons having registration rights with respect to such offering, pro rata among such other Persons based on the number of shares of Common Stock each requested to be included.

(d) The Requesting Holders shall determine the pricing of the Registrable Securities offered pursuant to any Shelf Underwritten Offering and the applicable underwriting discounts and commissions and determine the timing of any such Shelf Underwritten Offering, subject to Section 2.3.

(e) Each Holder shall have the right to withdraw their Registrable Securities from the Shelf Underwritten Offering at any time prior to the execution of an underwriting agreement with respect thereto by giving written notice to the Company of its request to withdraw.

Section 2.3 Delay and Suspension Rights. Notwithstanding any other provision of this Agreement, the Company may (i) delay effecting a Shelf Underwritten Offering or (ii) suspend the Holders’ use of any prospectus that is a part of a Shelf Registration Statement upon written notice to each Holder whose Registrable Securities are included in such Shelf Registration Statement (provided that in no event shall such notice contain any material non-public information regarding the Company without the written consent of such Holder) (in which event such Holder shall discontinue sales of Registrable Securities pursuant to such Registration Statement but may settle any then-contracted sales of Registrable Securities), in each case for a period of up to 60 consecutive days, if the Board determines in good faith (A) that such delay or suspension is in the best interest of the Company and its stockholders generally due to a pending material financing or other material transaction involving the Company, (B) that such registration or offering would render the Company unable to comply with applicable securities laws or (C) that such registration or offering would require disclosure of material information that the Company has a bona fide business purpose for preserving as confidential (any such period, a “Suspension Period”); provided, however, that in no event shall any Suspension Periods collectively exceed an aggregate of 60 days in any 180-day period or exceed an aggregate of 120 days in any 12-month period. The Company shall promptly notify each Holder in writing of the date on which any Suspension Period ends.

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Section 2.4 Piggyback Registration Rights.

(a) Subject to Section 2.4(c), if the Company at any time proposes to file an Underwritten Offering Filing for an Underwritten Offering of shares of Common Stock for its own account or for the account of any other Persons who have or have been granted registration rights, other than the Holders (a “Piggyback Underwritten Offering”), it will give written notice of such Piggyback Underwritten Offering to each Holder, which notice shall include the anticipated filing date of the Underwritten Offering Filing and, if known, the number of shares of Common Stock that are proposed to be included in such Piggyback Underwritten Offering, and of such Holders’ rights under this Section 2.4(a). Such notice shall be given promptly (and in any event at least five Business Days before the filing of the Underwritten Offering Filing or two Business Days before the filing of the Underwritten Offering Filing in connection with a bought or overnight Underwritten Offering). If such notice is delivered pursuant to this Section 2.4(a), each such Holder shall then have four Business Days (or two Business Days in the case of a bought or overnight Underwritten Offering) after the date on which the Holders received notice pursuant to this Section 2.4(a) to request inclusion of Registrable Securities in the Piggyback Underwritten Offering (which request shall specify the maximum number of Registrable Securities intended to be disposed of by such Holder and such other information as is reasonably required to effect the inclusion of such Registrable Securities) (any such Holder making such request, a “Piggybacking Holder”). If no request for inclusion from a Holder is received within such period, such Holder shall have no further right to participate in such Piggyback Underwritten Offering. Subject to Section 2.4(c), the Company shall use its commercially reasonable efforts to include in the Piggyback Underwritten Offering all Registrable Securities that the Company has been so requested to include by the Piggybacking Holders; provided, however, that if, at any time after giving written notice of a proposed Piggyback Underwritten Offering pursuant to this Section 2.4(a) and prior to the execution of an underwriting agreement with respect thereto, the Company or such other Persons who have or have been granted registration rights, as applicable, shall determine for any reason not to proceed with or to delay such Piggyback Underwritten Offering, the Company shall give written notice of such determination to the Piggybacking Holders and (i) in the case of a determination not to proceed, shall be relieved of its obligation to include any Registrable Securities in such Piggyback Underwritten Offering (but not from any obligation of the Company to pay the Registration Expenses in connection therewith), and (ii) in the case of a determination to delay, shall be permitted to delay inclusion of any Registrable Securities for the same period as the delay in including the shares of Common Stock to be sold for the Company’s account or for the account of such other Persons who have or have been granted registration rights, as applicable.

(b) Each Holder shall have the right to withdraw its request for inclusion of its Registrable Securities in any Piggyback Underwritten Offering at any time prior to the execution of an underwriting agreement with respect thereto by giving written notice to the Company of its request to withdraw. Any Holder may deliver written notice (an “Opt-Out Notice”) to the Company requesting that such Holder not receive notice from the Company of any proposed Piggyback Underwritten Offering; provided, however, that such Holder may later revoke any such Opt-Out Notice in writing. Following receipt of an Opt-Out Notice from a Holder (unless subsequently revoked), the Company shall not, and shall not be required to, deliver any notice to such Holder pursuant to this Section 2.4 and such Holder shall no longer be entitled to participate in any Piggyback Underwritten Offering.

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(c) If the Managing Underwriter of the Piggyback Underwritten Offering shall inform the Company of its belief that the number of Registrable Securities requested to be included in such Piggyback Underwritten Offering, when added to the number of shares of Common Stock proposed to be offered by the Company or such other Persons who have or have been granted registration rights (and any other shares of Common Stock requested to be included by any other Persons having registration rights on parity with the Piggybacking Holders with respect to such offering), would materially adversely affect such offering, then the Company shall include in such Piggyback Underwritten Offering, to the extent of the total number of securities which the Company is so advised can be sold in such offering without so materially adversely affecting such offering, shares of Common Stock in the following priority:

(i) if the Piggyback Underwritten Offering is for the account of the Company, first, all shares of Common Stock that the Company proposes to include for its own account (the “Company Securities”), second, the shares of Common Stock that the Piggybacking Holders propose to include (pro rata among the Piggybacking Holders based on the number of shares of Common Stock each requested to be included), and third, the shares of Common Stock that other Persons who have or have been granted registration rights propose to include (pro rata among such other Persons based on the number of shares of Common Stock each requested to be included); or

(ii) if the Piggyback Underwritten Offering is for the account of any other Persons who have or have been granted registration rights, first, the shares of Common Stock that such other Persons propose to include (pro rata among such other Persons based on the number of shares of Common Stock each requested to be included), second, all shares of Common Stock that the Piggybacking Holders propose to include (pro rata among the Piggybacking Holders based on the number of shares of Common Stock each requested to be included), and third, the Company Securities.

Section 2.5 Participation in Underwritten Offerings.

(a) In connection with any Underwritten Offering contemplated by Section 2.2 or Section 2.4, the underwriting agreement into which each Selling Holder and the Company shall enter into shall contain such representations, covenants, indemnities (subject to Article III) and other rights and obligations as are customary in Underwritten Offerings of securities by the Company, and the Company shall be entitled to designate counsel for the underwriters. No Selling Holder shall be required to make any representations or warranties to or agreements with the Company or the underwriters other than representations, warranties or agreements regarding such Selling Holder’s authority to enter into such underwriting agreement and to sell, and its ownership of, the securities being registered on its behalf, its intended method of distribution and any other representation required by law.

(b) Any participation by the Piggybacking Holders in a Piggyback Underwritten Offering shall be in accordance with the plan of distribution of the Company or the other Persons who have registration rights, as applicable.

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(c) In connection with any Piggyback Underwritten Offering in which any Piggybacking Holder includes Registrable Securities pursuant to Section 2.4, such Piggybacking Holder agrees (A) to supply any information reasonably requested by the Company in connection with the preparation of a Registration Statement and/or any other documents relating to such registered offering and (B) to execute and deliver any agreements and instruments being executed by all holders on substantially the same terms reasonably requested by the Company or the Managing Underwriter, as applicable, to effectuate such registered offering, including, without limitation, underwriting agreements (subject to Section 2.5(a)), custody agreements, powers of attorney, questionnaires, and lock-ups or “hold back” agreements pursuant to which such Piggybacking Holder agrees with the Managing Underwriter not to sell or purchase any securities of the Company for the shorter of (i) the same period of time following the registered offering as is agreed to by the Company and the other participating holders (not to exceed the shortest number of days that any director of the Company, “executive officer” (as defined under Section 16 of the Exchange Act) of the Company or any stockholder of the Company (other than a Holder or director or employee of, or consultant to, the Company) who owns 10% or more of the outstanding shares contractually agrees with the underwriters of such Piggyback Underwritten Offering not to sell any securities of the Company following such Piggyback Underwritten Offering) and (ii) 60 days from the date of the execution of the underwriting agreement with respect to such Piggyback Underwritten Offering.

Section 2.6 Registration Procedures.

(a) In connection with its obligations under this Article II, the Company will take all reasonably necessary action to facilitate and effect the transactions contemplated thereby, including, but not limited to, the following:

(i) promptly prepare and file with the Commission such amendments and supplements to such Registration Statement and the prospectus used in connection therewith as may be necessary to keep such Registration Statement effective and to comply with the provisions of the Securities Act with respect to the disposition of all securities covered by such Registration Statement until such time as all of such securities have been disposed of in accordance with the intended methods of disposition by the Selling Holder or Selling Holder thereof set forth in such Registration Statement;

(ii) furnish to each Selling Holder, without charge, such number of conformed copies of such Registration Statement and of each such amendment and supplement thereto (in each case including, without limitation, all exhibits), such number of copies of the prospectus contained in such Registration Statement (including without limitation each preliminary prospectus and any summary prospectus) and any other prospectus filed under Rule 424 under the Securities Act, in conformity with the requirements of the Securities Act, and such other documents, as such Selling Holder may reasonably request;

(iii) if applicable, use its commercially reasonable efforts to register or qualify all Registrable Securities and other securities covered by such Registration Statement under such other securities or blue sky laws of such jurisdictions as each Selling Holder thereof shall reasonably request, to keep such registration or qualification in effect for so long as such Registration Statement remains in effect, and to take any other action which may be reasonably necessary or advisable to enable such Selling Holder to

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consummate the disposition in such jurisdictions of the securities owned by such Selling Holder, except that the Company shall not for any such purpose be required to qualify generally to do business as a foreign corporation in any jurisdiction wherein it would not but for the requirements of this clause (iii) be obligated to be so qualified or to consent to general service of process in any such jurisdiction;

(iv) use its commercially reasonable efforts to provide to each Selling Holder and any underwriters a copy of any customary auditor “comfort” letters or legal opinions;

(v) promptly notify each Selling Holder, at any time when a prospectus relating thereto is required to be delivered under the Securities Act, upon discovery that, or upon the happening of any event as a result of which, the prospectus included in such Registration Statement, as then in effect, includes an untrue statement of a material fact or omits to state any material fact required to be stated therein or necessary to make the statements therein not misleading in the light of the circumstances under which they were made, and at the request of any such Selling Holder promptly prepare and file or furnish to such Selling Holder a reasonable number of copies of a supplement or post-effective amendment to the Registration Statement or a supplement to the related prospectus or any document incorporated or deemed to be incorporated therein by reference, or file any other required document as may be necessary so that, as thereafter delivered to the purchasers of such securities, such prospectus shall not include an untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary to make the statements therein not misleading in the light of the circumstances under which they were made;

(vi) otherwise comply with all applicable rules and regulations of the Commission, and make available to its security holders, as soon as reasonably practicable, an earnings statement, which earnings statement shall satisfy the provisions of Section 11(a) of the Securities Act, and shall furnish to each such Selling Holder at least the Business Day prior to the filing thereof a copy of any amendment or supplement to such Registration Statement or prospectus;

(vii) provide and cause to be maintained a transfer agent and registrar for all Registrable Securities covered by such Registration Statement from and after a date not later than the effective date of such Registration Statement;

(viii) in connection with the preparation and filing of any Registration Statement or any sale of Registrable Securities in connection therewith, the Company will give the Holders offering and selling thereunder, any underwriters and their respective counsels a reasonable opportunity (no less than two Business Days) to review and provide comments on such Registration Statement, each prospectus included therein or filed with the Commission, and each amendment thereof or supplement thereto (other than amendments or supplements that do not make any material change in the information related to the Company) (provided that the Company shall not file any such Registration Statement including Registrable Securities or an amendment thereto or any related prospectus or any supplement thereto to which such Holders or any underwriter shall reasonably object in writing), and give each of them, together with any underwriter, broker,

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dealer or sales agent involved therewith, such access to its books and records and such opportunities to discuss the business of the Company and its subsidiaries with its officers, its counsel, and the independent public accountants who have certified its financial statements as shall be necessary, in the opinion of the Holder’s and such underwriters’ (or broker’s, dealer’s or sales agent’s, as the case may be) respective counsel, to conduct a reasonable due diligence investigation within the meaning of the Securities Act;

(ix) use its commercially reasonable efforts to prevent the issuance of any order suspending the effectiveness of the Registration Statement, and, if any such order suspending the effectiveness of such Registration Statement is issued, shall promptly use its commercially reasonable efforts to obtain the withdrawal of such order at the earliest possible moment;

(x) promptly notify the Holders (i) of the issuance by the Commission of any stop order suspending the effectiveness of the Registration Statement or the initiation or threat of any proceedings for that purpose, (ii) of any delisting or pending delisting of the Common Stock by any national securities exchange or market on which the Common Stock are then listed or quoted, and (iii) of the receipt by the Company of any notification with respect to the suspension of the qualification of any Registrable Securities for sale under the securities or “blue sky” laws of any jurisdiction or the initiation of any proceeding for such purpose;

(xi) cause all Registrable Securities covered by such Registration Statement to be listed on any securities exchange on which the Common Stock is then listed;

(xii) enter into such customary agreements, including but not limited to lock-up agreements by the Company (and, if reasonably requested by the Managing Underwriter(s), the Company’s directors and “executive officers” (as defined under Section 16 of the Exchange Act)) that extend through 60 days following the entrance into the corresponding underwriting agreement, and to take such other actions as the Holder or Holders shall reasonably request in order to expedite or facilitate the disposition of such Registrable Securities; and

(xiii) cause its officers to use their commercially reasonable efforts to support the marketing of the Registrable Securities covered by the Registration Statement (including, without limitation, participation in electronic or telephonic “road shows”).

(b) Each Holder agrees by acquisition of such Registrable Securities that upon receipt of any notice from the Company of the happening of any event of the kind described in Section 2.6(a)(v), such Holder will forthwith discontinue such Holder’s disposition of Registrable Securities pursuant to the Registration Statement until such Holder’s receipt of the copies of the supplemented or amended prospectus contemplated by Section 2.6(a)(v) as filed with the Commission or until it is advised in writing by the Company that the use of such Registration Statement may be resumed, and, if so directed by the Company, will deliver to the Company (at the Company’s expense) all copies, other than permanent file copies, then in such Holder’s possession of the prospectus relating to such Registrable Securities current at the time of receipt of such notice. The Company may provide appropriate stop orders to enforce the provisions of this Section 2.6(b).

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Section 2.7 Cooperation by Holders. The Company shall have no obligation to include Registrable Securities of a Holder in any Registration Statement or Underwritten Offering if such Holder has failed to timely furnish such information as the Company may, from time to time, reasonably request in writing regarding such Holder and the distribution of such Registrable Securities that the Company determines, after consultation with its counsel, is reasonably required in order for any registration statement or prospectus supplement, as applicable, to comply with the Securities Act.

Section 2.8 Expenses. The Company shall be responsible for all Registration Expenses incident to its performance of or compliance with its obligations under this Article II. Each Selling Holder shall pay its pro rata share of all Selling Expenses in connection with any sale of its Registrable Securities hereunder.

Section 2.9 Additional Rights. The Company is not currently a party to any agreement with respect to its securities that in any way violates or subordinates rights granted to the Holders by this Agreement. From and after the date hereof, the Company shall not, without the prior written consent of the Majority Holders, enter into or amend any agreement with any current or future holder of any securities of the Company that would allow such current or future holder to require the Company to include securities in any registration statement filed by the Company for such holders on a basis other than expressly subordinate to, the piggyback rights of the Holders hereunder; provided, that in no event shall the Company enter into any agreement that would permit another holder of securities of the Company to participate on a pari passu basis (in terms of priority of cut-back based on advice of underwriters) with a Requesting Holder in a Shelf Underwritten Offering.

ARTICLE III

INDEMNIFICATION AND CONTRIBUTION

Section 3.1 Indemnification by the Company. The Company will indemnify and hold harmless each Holder, its officers and directors and each Person (if any) that controls such Holder within the meaning of either Section 15 of the Securities Act or Section 20 of the Exchange Act from and against any and all losses, claims, damages, liabilities, costs (including costs of preparation and attorneys’ fees and any legal or other fees or expenses incurred by such Person in connection with any investigation or Proceeding), expenses, judgments, fines, penalties, charges and amounts paid in settlement (“Losses”) as incurred, caused by, arising out of or based upon, resulting from or related to any untrue statement or alleged untrue statement of a material fact contained in any Registration Statement or prospectus relating to the Registrable Securities (as amended or supplemented if the Company shall have furnished any amendments or supplements thereto) or any preliminary prospectus, any filing made in connection with the qualifications of the offering under the securities or other blue sky laws of any jurisdiction in which Registrable Securities are offered, or any other offering document (including any related notification, or the like) incident to any such registration, qualification, or compliance, or based on any or any omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the statements therein not misleading (in the case of any prospectus, in the light

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of the circumstances under which such statement is made), or any violation by the Company of this Agreement, the Securities Act or the Exchange Act, or any rule or regulation thereunder applicable to the Company and relating to action or inaction required of the Company in connection with any such registration, qualification, or compliance, and shall reimburse each Holder, its directors and officers, and each controlling Person for any legal or other expenses reasonably incurred by any of them in connection with any investigation or defending such claim; provided, however, that the indemnity agreement contained in this Section 3.1 shall not apply to that portion of such Losses caused by, or arising out of, any untrue statement, or alleged untrue statement or any such omission or alleged omission, to the extent such statement or omission was made in reliance upon and in conformity with information furnished in writing to the Company by or on behalf of such Holder expressly for use therein.

Section 3.2 Indemnification by the Holders. Each Holder agrees to indemnify and hold harmless the Company, its officers and directors and each Person (if any) that controls the Company within the meaning of either Section 15 of the Securities Act or Section 20 of the Exchange Act from and against any and all Losses caused by, arising out of, resulting from or related to any untrue statement or alleged untrue statement of a material fact contained in any Registration Statement or prospectus relating to Registrable Securities (as amended or supplemented if the Company shall have furnished any amendments or supplements thereto) or any preliminary prospectus, or any omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the statements therein not misleading (in the case of any prospectus, in the light of the circumstances under which such statement is made), only to the extent such statement or omission was made in reliance upon and in conformity with information furnished in writing by or on behalf of such Holder expressly for use therein, and shall reimburse the Company, its directors and officers, and each controlling Person for any legal or other expenses reasonably incurred by any of them in connection with any investigation or defending such claim; provided, however, that the indemnity agreement contained in this Section 3.2 shall not apply to amounts paid in settlement of any such claim or proceeding if such settlement is effected without the consent of the Holder, which consent shall not be unreasonably withheld. Each selling Holder’s indemnification obligations hereunder shall be several and not joint and several and shall be limited to the amount of any net proceeds actually received by such selling Holder, except in the case of fraud or willful misconduct by such Holder.

Section 3.3 Indemnification Procedures. In case any Proceeding (including any governmental investigation) shall be instituted involving any Person in respect of which indemnity may be sought pursuant to Section 3.1 or Section 3.2, such Person (the “Indemnified Party”) shall promptly notify the Person against whom such indemnity may be sought (the “Indemnifying Party”) in writing (provided that the failure of the Indemnified Party to give notice as provided herein shall not relieve the Indemnifying Party of its obligations under this Article III, except to the extent the Indemnifying Party is actually and materially prejudiced by such failure to give notice), and the Indemnifying Party shall be entitled to participate in such Proceeding and, unless in the reasonable opinion of outside counsel to the Indemnified Party a conflict of interest between the Indemnified Party and Indemnifying Party may exist in respect of such claim, to assume the defense thereof jointly with any other Indemnifying Party similarly notified, to the extent that it chooses, with counsel reasonably satisfactory to such Indemnified Party, and after notice from the Indemnifying Party to such Indemnified Party that it so chooses, the Indemnifying Party shall not be liable to such Indemnified Party for any legal or other expenses subsequently incurred by such

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Indemnified Party in connection with the defense thereof other than reasonable costs of investigation; provided, however, that (i) if the Indemnifying Party fails to assume the defense or employ counsel reasonably satisfactory to the Indemnified Party, (ii) if such Indemnified Party who is a defendant in any action or Proceeding that is also brought against the Indemnifying Party reasonably shall have concluded that there may be one or more legal defenses available to such Indemnified Party that are not available to the Indemnifying Party or (iii) if representation of both parties by the same counsel is otherwise inappropriate under applicable standards of professional conduct then, in any such case, the Indemnified Party shall have the right to assume or continue its own defense as set forth above (but with no more than one firm of counsel for all Indemnified Parties in each jurisdiction, except to the extent any Indemnified Party or Parties reasonably shall have concluded that there may be legal defenses available to such party or parties that are not available to the other Indemnified Parties or to the extent representation of all Indemnified Parties by the same counsel is otherwise inappropriate under applicable standards of professional conduct) and the Indemnifying Party shall be liable for any expenses therefor. No Indemnifying Party shall, without the written consent of the Indemnified Party, effect the settlement or compromise of, or consent to the entry of any judgment with respect to, any pending or threatened action or claim in respect of which indemnification or contribution may be sought hereunder (whether or not the Indemnified Party is an actual or potential party to such action or claim) unless such settlement, compromise or judgment (A) includes an unconditional release of the Indemnified Party from all liability arising out of such action or claim and (B) does not include a statement as to, or an admission of, fault, culpability or a failure to act, by or on behalf of any Indemnified Party.

Section 3.4 Contribution.

(a) If the indemnification provided for in this Article III is unavailable to an Indemnified Party in respect of any Losses in respect of which indemnity is to be provided hereunder, then each Indemnifying Party, in lieu of indemnifying such Indemnified Party, shall to the fullest extent permitted by law contribute to the amount paid or payable by such Indemnified Party as a result of such Losses in such proportion as is appropriate to reflect the relative fault of such party in connection with the statements or omissions that resulted in such Losses, as well as any other relevant equitable considerations. The relative fault of the Company (on the one hand) and a Holder (on the other hand) shall be determined by reference to, among other things, whether the untrue or alleged untrue statement of a material fact or the omission or alleged omission to state a material fact relates to information supplied by such party and the parties’ relative intent, knowledge, access to information and opportunity to correct or prevent such statement or omission.

(b) The Company and each Holder agree that it would not be just and equitable if contribution pursuant to this Article III were determined by pro rata allocation or by any other method of allocation that does not take account of the equitable considerations referred to in Section 3.4(a). The amount paid or payable by an Indemnified Party as a result of the losses, claims, damages or liabilities referred to in Section 3.4(a) shall be deemed to include, subject to the limitations set forth above, any legal or other expenses reasonably incurred by such Indemnified Party in connection with investigating or defending any such action or claim. Notwithstanding the provisions of this Article III, no Holder shall be liable for indemnification or contribution pursuant to this Article III for any amount in excess of the net proceeds of the offering received by such Holder, less the amount of any damages that such Holder has otherwise been required to pay by reason of such untrue or alleged untrue statement or omission or alleged omission. No Person guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of the Securities Act) shall be entitled to contribution from any Person who was not guilty of such fraudulent misrepresentation.

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ARTICLE IV

RULE 144; ASSISTANCE WITH TRANSFERS.

Section 4.1 Rule 144.

(a) With a view to making available the benefits of certain rules and regulations of the Commission that may permit the resale of the Registrable Securities without registration, the Company agrees to use its commercially reasonable efforts to:

(i) make and keep public information regarding the Company available, as those terms are understood and defined in Rule 144 under the Securities Act, at all times from and after the date hereof;

(ii) file with the Commission in a timely manner all reports and other documents required of the Company under the Securities Act and the Exchange Act at all times from and after the date hereof; and

(iii) so long as a Holder owns any Registrable Securities, furnish (i) to the extent accurate, forthwith upon request, a written statement of the Company that it has complied with the reporting requirements of Rule 144 under the Securities Act and (ii) unless otherwise available via the Commission’s EDGAR filing system, to such Holder forthwith upon request a copy of the most recent annual or quarterly report of the Company, and such other reports and documents so filed as such Holder may reasonably request in availing itself of any rule or regulation of the Commission allowing such Holder to sell any such securities without registration.

Section 4.2 Assistance with Transfers. In connection with any sale or transfer of Registrable Securities by any Holder, including any sale or transfer pursuant to Rule 144 and other rules and regulations of the Commission that may at any time permit a Holder of Registrable Securities to sell securities of the Company to the public without registration, the Company shall, to the extent allowed by law, take any and all action necessary or reasonably requested by such Holder in order to permit or facilitate such sale or transfer, including, without limitation, at the sole expense of the Company, by (i) issuing such directions to any transfer agent, registrar or depositary, as applicable, (ii) delivering such opinions to the transfer agent, registrar or depositary as are customary for the transaction of this type and are reasonably requested by the same, and (iii) taking or causing to be taken such other actions as are reasonably necessary (in each case on a timely basis) in order to cause any legends, notations or similar designations restricting transferability of the Registrable Securities held by such Holder to be removed and to rescind any transfer restrictions with respect to such Registrable Securities; provided, however, that such Holder shall deliver to the Company, in form and substance reasonably satisfactory to the Company, representation letters regarding such Holder’s compliance with such rules and regulations, as may be applicable. In addition, the Company, at its sole expense, shall use commercially reasonable efforts to remove any restrictive legend on any shares of Common Stock

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that are Registrable Securities upon request by the Holder if (A) such shares of Common Stock are sold pursuant to an effective registration statement or (B) a registration statement covering the resale of such shares of Common Stock is effective under the Securities Act and the applicable Holder delivers to the Company a representation letter agreeing that such shares of Common Stock will be sold under such effective registration statement.

ARTICLE V

TRANSFER OR ASSIGNMENT OF RIGHTS

The rights to cause the Company to register Registrable Securities under Article II of this Agreement may be transferred or assigned by each Holder to one or more Transferees or assignees of Registrable Securities if such Transferee is (i) a Permitted Transferee or (ii) acquiring at least $500,000 of Registrable Securities as determined by reference to the volume weighted average price for such Registrable Securities on any securities exchange or market on which the Common Stock are then listed or quoted for the five trading days immediately preceding the applicable determination date and such Transferee has delivered to the Company a duly executed Adoption Agreement.

ARTICLE VI

MISCELLANEOUS

Section 6.1 Termination. This Agreement shall terminate as to any Holder, when such Holder no longer owns any shares of Common Stock that constitute Registrable Securities; provided, however, that Article III shall survive any termination hereof.

Section 6.2 Severability. If any provision of this Agreement shall be determined to be illegal and unenforceable by any court of law, the remaining provisions shall be severable and enforceable in accordance with their terms.

Section 6.3 Remedies. In the event of actual or potential breach by the Company of any of its obligations under this Agreement, each Holder, in addition to being entitled to exercise all rights granted by law and under this Agreement, including recovery of damages, will be entitled to specific performance of its rights under this Agreement. The Company agrees that monetary damages would not provide adequate compensation for any losses incurred by reason of a breach by it of any of the provisions of this Agreement and further agrees that, in the event of any action for specific performance in respect of such breach, it shall waive the defense that a remedy at law would be adequate.

Section 6.4 Governing Law; Waiver of Jury Trial.

(a) This Agreement shall be governed by and construed in accordance with the laws of the State of Delaware, without regard to principles of conflicts of laws that would direct the application of the laws of another jurisdiction.

(b) THE PARTIES HEREBY WAIVE TRIAL BY JURY IN ANY ACTION, PROCEEDING OR COUNTERCLAIM BROUGHT BY ANY PARTY AGAINST ANOTHER IN ANY MATTER WHATSOEVER ARISING OUT OF OR IN RELATION TO OR IN CONNECTION WITH THIS AGREEMENT. FURTHER, NOTHING HEREIN SHALL DIVEST A COURT OF COMPETENT JURISDICTION OF THE RIGHT AND POWER TO GRANT A TEMPORARY RESTRAINING ORDER, TO GRANT TEMPORARY INJUNCTIVE RELIEF, OR TO COMPEL SPECIFIC PERFORMANCE OF ANY DECISION OF AN ARBITRAL TRIBUNAL MADE PURSUANT TO THIS PROVISION.

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Section 6.5 Adjustments Affecting Registrable Securities. The provisions of this Agreement shall apply to any and all shares of capital stock of the Company or any successor or assignee of the Company (whether by merger, consolidation, sale of assets or otherwise) that may be issued in respect of, in exchange for or in substitution for the Registrable Securities, by reason of any stock dividend, split, reverse split, combination, recapitalization, reclassification, merger, consolidation or otherwise in such a manner and with such appropriate adjustments as to reflect the intent and meaning of the provisions hereof and so that the rights, privileges, duties and obligations hereunder shall continue with respect to the capital stock of the Company as so changed.

Section 6.6 Binding Effects; Benefits of Agreement. This Agreement shall be binding upon and inure to the benefit of the Company and its successors and assigns and each Holder and its successors and assigns. Except as provided in Article V, neither this Agreement nor any of the rights, benefits or obligations hereunder may be assigned or transferred, by operation of law or otherwise, by any Holder without the prior written consent of the Company.

Section 6.7 Notices. All notices or other communications that are required or permitted hereunder shall be in writing and shall be deemed to have been given if (i) personally delivered, (ii) sent by nationally recognized overnight courier, (iii) sent by registered or certified mail, postage prepaid, return receipt requested or (iv) email, addressed as follows:

(a) If to the Company, to:

Mesa Air Group, Inc.

410 N. 44th Street

Suite 700

Phoenix, AZ 85008

Attention: President (with a copy to General Counsel)

Facsimile No.: (602) 685-4350

Email: michael.lotz@mesa-air.com, brad.rich@mesa-air.com, brian.gillman@mesa-air.com

(b) If to the Investor, to:

United Airlines, Inc.

233 S. Wacker Drive

Chicago, IL 60606

Attention:     Senior Vice President and General Counsel

Email:          bob.rivkin@united.com

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with a copy to (which shall not constitute notice):

Sidley Austin LLP

1000 Louisiana Street, Suite 5900

Houston, Texas 77002

Attention:      Kevin P. Lewis

Atman Shukla

Jon W. Daly

Email:           klewis@sidley.com

ashukla@sidley.com

jdaly@sidley.com

(c) If to any other Holders, to their respective addresses set forth on the applicable Adoption Agreement;

or to such other address as the party to whom notice is to be given may have furnished to such other party in writing in accordance herewith. Any such communication shall be deemed to have been received (i) when delivered, if personally delivered, (ii) on the date sent if delivered by e-mail on a Business Day, or if not sent on a Business Day, on the first Business Day thereafter, (iii) the next Business Day after delivery, if sent by nationally recognized overnight courier, and (iv) on the third (3rd) Business Day following the date on which the piece of mail containing such communication is posted, if sent by first-class mail.

Section 6.8 Modification; Waiver. This Agreement may be amended, modified or supplemented only by a written instrument duly executed by the Company and the Majority Holders. No course of dealing between the Company and the Holders (or any of them) or any delay in exercising any rights hereunder will operate as a waiver of any rights of any party to this Agreement. The failure of any party to enforce any of the provisions of this Agreement will in no way be construed as a waiver of such provisions and will not affect the right of such party thereafter to enforce each and every provision of this Agreement in accordance with its terms.

Section 6.9 Entire Agreement. Except as otherwise expressly provided herein, this Agreement constitutes the entire agreement among the parties pertaining to the subject matter hereof and supersedes all prior and contemporaneous agreements and understandings of the parties in connection therewith.

Section 6.10 Counterparts. This Agreement may be executed in any number of counterparts, and each such counterpart shall be deemed to be an original instrument, but all such counterparts taken together shall constitute but one agreement.

[Signature Pages Follow]

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IN WITNESS WHEREOF, each of the Parties has caused this Agreement to be executed by its undersigned duly authorized representative as of the date first written above.

MESA AIR GROUP, INC.
By:	/s/ Mike Lotz
	Name: Mike Lotz Title: President

Signature Page to Registration Rights Agreement

UNITED AIRLINES, INC.
By:	/s/ Jonathan Ireland
	Name: Jonathan Ireland
	Title: SVP, Finance

Signature Page to Registration Rights Agreement

EXHIBIT A

ADOPTION AGREEMENT

This Adoption Agreement (“Adoption Agreement”) is executed by the undersigned transferee (“Transferee”) pursuant to the terms of the Registration Rights Agreement, dated as of March 6, 2023, among Mesa Air Group, Inc. (the “Company”), United Airlines, Inc. and the Holders party thereto (as amended from time to time, the “Registration Rights Agreement”). Terms used and not otherwise defined in this Adoption Agreement have the meanings set forth in the Registration Rights Agreement.

By the execution of this Adoption Agreement, the Transferee agrees as follows:

1. Acknowledgement. Transferee acknowledges that Transferee is acquiring certain shares of Common Stock of the Company, subject to the terms and conditions of Registration Rights Agreement, among the Company and the Holders party thereto.

2. Agreement. Transferee (i) agrees that the shares of Common Stock of the Company acquired by Transferee shall be bound by and subject to the terms of the Registration Rights Agreement, pursuant to the terms thereof, and (ii) hereby adopts the Registration Rights Agreement with the same force and effect as if he, she or it were originally a party thereto.

3. Notice. Any notice required as permitted by the Registration Rights Agreement shall be given to Transferee at the address listed beside Transferee’s signature below.

4. Joinder. The spouse of the undersigned Transferee, if applicable, executes this Adoption Agreement to acknowledge its fairness and that it is in such spouse’s best interest, and to bind such spouse’s community interest, if any, in the shares of Common Stock and other securities referred to above and in the Registration Rights Agreement, to the terms of the Registration Rights Agreement.

Signature:

Address:

Contact Person:

Telephone No:

Email: