Supplemental Indenture, dated as of November 17, 2022, among Spirit IP Cayman Ltd., Spirit Loyalty Cayman Ltd., the guarantors named therein and Wilmington Trust, National Association, as trustee and collateral custodian

First Supplemental Indenture (this “Supplemental Indenture”), dated as of November 17, 2022, among (i) Spirit IP Cayman Ltd. (“Brand Issuer”) and Spirit Loyalty Cayman Ltd. (“Loyalty Issuer” together with Brand Issuer, the “Co-Issuers”), (ii) Spirit Airlines, Inc., Spirit Finance Cayman 1 Ltd., Spirit Finance Cayman 2 Ltd. (collectively, the “Guarantors”) and (iii) Wilmington Trust, National Association, as trustee (the “Trustee”) and as collateral custodian (the “Collateral Custodian”).

WHEREAS, each of the Co-Issuers and the Guarantors (as defined in the Indenture referred to below) has heretofore executed and delivered to the Trustee and the Collateral Custodian an indenture, dated as of September 17, 2020 (the “Original Indenture,” as further amended and supplemented, including by this Supplemental Indenture, the “Indenture”), providing for the initial issuance of $850,000,000 of 8.00% Senior Secured Notes due 2025 (the “Existing Notes”), of which $340,000,000 was redeemed on May 10, 2021;

WHEREAS, pursuant to Section 2.01(d) of the Original Indenture, the Co-Issuers may create and issue “Additional Notes” (as defined therein) ranking pari passu with the Existing Notes from time to time without notice to or consent of the Holders, which Additional Notes shall be consolidated with and form a single class with the Existing Notes and shall have the same terms as to status, redemption or otherwise as the Existing Notes;

WHEREAS, the Co-Issuers have authorized the execution and delivery of this Supplemental Indenture for the purpose of issuing $600,000,000 in aggregate principal amount of 8.00% Senior Secured Notes due 2025 as Additional Notes under the Original Indenture (the “Additional Notes” and, together with the Existing Notes, the “Notes”);

WHEREAS, the Additional Notes shall have terms substantially identical in all material respects to the Existing Notes (other than issue date, issue price and the first interest payment date and the initial interest accrual date), and the Additional Notes and the Existing Notes shall vote together and shall be treated as a single class for all purposes under the Indenture, including, without limitation, waivers, amendments, redemptions and offers to purchase; provided that the Additional Notes are not fungible with the Existing Notes for U.S. federal income tax purposes, and, accordingly, such Additional Notes will have one or more separate CUSIP and/or other securities numbers;

WHEREAS, pursuant to Section 9.01(a)(i) of the Indenture, the Co-Issuers and the Trustee are authorized to execute and deliver this Supplemental Indenture to amend or supplement the Original Indenture without the consent of Holders in order to effect the issuance of Additional Notes; and

WHEREAS, the execution and delivery of this Supplemental Indenture has been duly authorized by the parties hereto, and all conditions necessary to make this Supplemental Indenture a valid and binding agreement of the Co-Issuers and Guarantors, enforceable in accordance with its terms, have been duly performed and complied with;

NOW THEREFORE, in consideration of the foregoing and for other good and valuable consideration, the receipt of which is hereby acknowledged, the parties hereto mutually covenant and agree for the equal and ratable benefit of the Holders of the Notes as follows:

(1)Capitalized Terms. Capitalized terms used herein without definition shall have the meanings assigned to them in the Original Indenture.

(2)Amount of Additional Notes. The aggregate principal amount of Additional Notes to be authenticated and delivered under the Original Indenture and pursuant to this Supplemental Indenture on the date hereof is $600,000,000.

(3)Terms of Additional Notes. As of the date hereof, the Co-Issuers will issue, and the Trustee is directed to authenticate and deliver, the Additional Notes under the Indenture, with the terms described below. The Additional Notes will:

a.be issued as part of the same class as the Existing Notes previously issued under the Indenture and constitute “Notes” for all purposes under the Indenture, and the Additional Notes and the Existing Notes shall be a single class for all purposes under the Indenture, including, without limitation, as to waivers, amendments, redemptions and offers to purchase;

b.rank pari passu with the Existing Notes and shall have identical terms and conditions as the Existing Notes other than issue date, issue price, the first Interest Payment Date and the first date from which interest will accrue;

c.(i) be issued on November 17, 2022, at an issue price of 98.50% of the principal amount, plus accrued and unpaid interest from October 20, 2022 (the first day of the current interest period of the Existing Notes) to, but not including, the issue date, (ii) accrue interest from October 20, 2022 and (iii) have a first Interest Payment Date of January 20, 2023;

d.be issuable in whole in the form of Global Notes to be held by the Trustee, as custodian for the Notes Depositary and in the form, including appropriate transfer restriction legends provided in Section 2.06(g) of the Indenture, set forth in Exhibit A to this Supplemental Indenture; and

e.bear the CUSIP number of 84859BAB7 and ISIN number of US84859BAB71 (with respect to the Additional Notes that are issued in the form of 144A Global Notes) and bear the CUSIP number of G83518AB9 and ISIN number of USG83518AB91 (with respect to the Additional Notes that are issued in the form of Regulation S Global Notes).

(4)Confirmation of Note Guarantees and Reaffirmation of Security Interests. Each Co-Issuer and Guarantor hereby confirms that: (a) the Obligations of the Co-Issuers and Guarantors under the Indenture (including, without limitation, the Note Guarantees), as modified or supplemented hereby, shall continue to be in full force and effect and are hereby ratified and confirmed in all respects, (b) the Obligations under the Additional Notes will be and are secured equally and ratably by all Liens granted in connection with the issuance of the Existing Notes. Each Co-Issuer and each Guarantor, as a Grantor under the respective Collateral Documents to which it is a party, reaffirms its pledge and grant to the Collateral Agent for the benefit of the Senior Secured Parties a security interest in its respective Collateral as a Priority Lien to secure the Obligations. The Co-Issuers and the Trustee acknowledge and agree that the Additional Notes shall constitute “Notes” for all purposes under the Collateral Documents, and as such the Holders of the Additional Notes shall be entitled to all the rights and benefits under and shall be subject in all other applicable respects to the provisions of the Collateral Documents, including the provisions relating to the ranking of Liens and the order of application of proceeds from the enforcement of Liens.

(5)Execution and Delivery. Each Co-Issuer and Guarantor represents and warrants to the Trustee and agrees that it has all the requisite corporate or other power and authority to execute, deliver and perform its obligations under this Supplemental Indenture, this

Supplemental Indenture has been duly and validly executed and delivered and constitutes its legal, valid and binding obligation, enforceable against it in accordance with its terms and the terms of the Indenture.

(6)Governing Law. THIS SUPPLEMENTAL INDENTURE, THE INDENTURE, THE NOTES, AND ANY CLAIM, CONTROVERSY OR DISPUTE ARISING UNDER OR RELATED TO THIS SUPPLEMENTAL INDENTURE SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK BUT WITHOUT GIVING EFFECT TO APPLICABLE PRINCIPLES OF CONFLICTS OF LAW TO THE EXTENT THAT THE APPLICATION OF THE LAWS OF ANOTHER JURISDICTION WOULD BE REQUIRED THEREBY.

(7)Counterparts. The parties may sign any number of copies of this Supplemental Indenture. Each signed copy shall be an original, but all of them together represent one and the same agreement. This Supplemental Indenture may be executed in multiple counterparts which, when taken together, shall constitute one instrument. The exchange of copies of this Supplemental Indenture and of signature pages by facsimile, PDF or other electronic transmission shall constitute effective execution and delivery of this Supplemental Indenture as to the parties hereto and may be used in lieu of the original Supplemental Indenture and signature pages for all purposes. Signatures of the parties hereto transmitted by facsimile, PDF or other electronic transmission shall be deemed to be their original signatures for all purposes.

(8)Effect of Headings. The Section headings herein are for convenience only and shall not affect the construction hereof.

(9)The Trustee. The Trustee shall not be responsible in any manner whatsoever for or in respect of the validity or sufficiency of this Supplemental Indenture or for or in respect of the recitals contained herein, all of which recitals are made solely by the Co-Issuers and the Guarantors.

(10)Successors. All agreements of the Co-Issuers and the Guarantors in this Supplemental Indenture shall bind their respective successors, except as otherwise provided in this Supplemental Indenture and the Indenture. All agreements of the Trustee in this Supplemental Indenture shall bind its respective successors.

(11)Limited Recourse: Non-Petition. Section 13.08 (Limited Recourse:Non-Petition) of the Original Indenture shall apply to this Supplemental Indenture mutatis mutandis.

(12)Ratification of Indenture; Supplemental Indentures Part of Indenture. Except as expressly amended hereby, the Indenture is in all respects ratified and confirmed and all the terms, conditions and provisions thereof shall remain in full force and effect. This Supplemental Indenture shall form a part of the Indenture for all purposes, and every Holder shall be bound hereby.

(13)By its signature below, each of the Co-Issuers and the Guarantors hereby authorizes and directs the Trustee to execute this Supplemental Indenture and take any and all action necessary or advisable and requested to effect the transactions contemplated hereby.

IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be duly executed, all as of the date first above written.

THIS GLOBAL NOTE IS HELD BY THE NOTES DEPOSITARY (AS DEFINED IN THE INDENTURE GOVERNING THIS NOTE) OR ITS NOMINEE IN CUSTODY FOR THE BENEFIT OF THE BENEFICIAL OWNERS HEREOF, AND IS NOT TRANSFERABLE TO ANY PERSON UNDER ANY CIRCUMSTANCES EXCEPT THAT (I) THE TRUSTEE MAY MAKE SUCH NOTATIONS HEREON AS MAY BE REQUIRED PURSUANT TO SECTION 2.06(H) OF THE INDENTURE, (II) THIS GLOBAL NOTE MAY BE EXCHANGED IN WHOLE BUT NOT IN PART PURSUANT TO SECTION 2.06(A) OF THE INDENTURE, (III) THIS GLOBAL NOTE MAY BE DELIVERED TO THE TRUSTEE FOR CANCELLATION PURSUANT TO SECTION 2.11 OF THE INDENTURE AND (IV) THIS GLOBAL NOTE MAY BE TRANSFERRED TO A SUCCESSOR NOTES DEPOSITARY WITH THE PRIOR WRITTEN CONSENT OF THE CO-ISSUERS. UNLESS AND UNTIL IT IS EXCHANGED IN WHOLE OR IN PART FOR NOTES IN DEFINITIVE FORM, THIS NOTE MAY NOT BE TRANSFERRED EXCEPT AS A WHOLE BY THE NOTES DEPOSITARY TO A NOMINEE OF THE NOTES DEPOSITARY OR BY A NOMINEE OF THE NOTES DEPOSITARY TO THE NOTES DEPOSITARY OR ANOTHER NOMINEE OF THE NOTES DEPOSITARY OR BY THE NOTES DEPOSITARY OR ANY SUCH NOMINEE TO A SUCCESSOR NOTES DEPOSITARY OR A NOMINEE OF SUCH SUCCESSOR NOTES DEPOSITARY. UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY (55 WATER STREET, NEW YORK, NEW YORK) (“DTC”) TO THE CO-ISSUERS OR THEIR AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY CERTIFICATE ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR SUCH OTHER NAME AS MAY BE REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO CEDE & CO. OR SUCH OTHER ENTITY AS MAY BE REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.

THE NOTES EVIDENCED HEREBY HAVE NOT BEEN REGISTERED UNDER THE UNITED STATES SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”) OR THE SECURITIES LAWS OF ANY STATE OR OTHER JURISDICTION AND MAY NOT BE OFFERED, SOLD, PLEDGED OR OTHERWISE TRANSFERRED EXCEPT (A) (1) TO SPIRIT AIRLINES, INC., HOLDCO 1, HOLDCO 2, BRAND ISSUER, LOYALTY ISSUER OR ONE OF THEIR RESPECTIVE SUBSIDIARIES, (2) TO A PERSON WHO THE SELLER REASONABLY BELIEVES IS A QUALIFIED INSTITUTIONAL BUYER WITHIN THE MEANING OF RULE 144A UNDER THE SECURITIES ACT PURCHASING FOR ITS OWN ACCOUNT OR FOR THE ACCOUNT OF A QUALIFIED INSTITUTIONAL BUYER IN A TRANSACTION MEETING THE REQUIREMENTS OF RULE 144A, (3) TO NON-U.S. PERSONS IN AN OFFSHORE TRANSACTION COMPLYING WITH RULE 903 OR RULE 904 OF REGULATION S UNDER THE SECURITIES ACT, (4) PURSUANT TO AN EXEMPTION FROM REGISTRATION UNDER THE SECURITIES ACT PROVIDED BY RULE 144 THEREUNDER (IF AVAILABLE) OR ANOTHER AVAILABLE EXEMPTION FROM SUCH REGISTRATION REQUIREMENTS OTHER THAN RULE 144A OR REGULATION S, OR (5) PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT AND (B) IN ACCORDANCE WITH ALL APPLICABLE SECURITIES LAWS OF THE STATES OF THE UNITED STATES AND OTHER JURISDICTIONS. IN ADDITION, THE NOTES MAY NOT TRANSFERRED TO OR HELD BY A COMPETITOR (AS DEFINED IN THE INDENTURE).

[[Regulation S Temporary Global Note Legend, to be inserted for Regulation S Temporary Global Notes only: BY ITS ACQUISITION HEREOF, THE HOLDER HEREOF REPRESENTS THAT IT IS NOT A U.S. PERSON, NOR IS IT PURCHASING FOR THE ACCOUNT OF A U.S. PERSON, AND IS ACQUIRING THIS SECURITY IN AN OFFSHORE TRANSACTION IN ACCORDANCE WITH REGULATION S UNDER THE SECURITIES ACT.

THE RIGHTS ATTACHING TO THIS REGULATION S TEMPORARY GLOBAL NOTE, AND THE CONDITIONS AND PROCEDURES GOVERNING ITS EXCHANGE FOR CERTIFICATED NOTES, ARE AS SPECIFIED IN THE INDENTURE (AS DEFINED HEREIN).

THIS NOTE HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT AND MAY NOT BE OFFERED, SOLD OR DELIVERED IN THE UNITED STATES OR TO, OR FOR THE ACCOUNT OR BENEFIT OF, ANY US PERSON, UNLESS SUCH NOTES ARE REGISTERED UNDER THE SECURITIES ACT OR AN EXEMPTION FROM THE REGISTRATION REQUIREMENTS THEREOF IS AVAILABLE. THE FOREGOING SHALL NOT APPLY FOLLOWING THE EXPIRATION OF FORTY DAYS FROM THE LATER OF (I) THE DATE ON WHICH THESE NOTES WERE FIRST OFFERED AND (II) THE DATE OF ISSUANCE OF THESE NOTES.]]

THIS SECURITY IS ISSUED WITH ORIGINAL ISSUE DISCOUNT FOR PURPOSES OF SECTION 1271 ET SEQ. OF THE INTERNAL REVENUE CODE OF 1986, AS AMENDED. A HOLDER MAY OBTAIN THE ISSUE PRICE, AMOUNT OF ORIGINAL ISSUE DISCOUNT, ISSUE DATE AND YIELD TO MATURITY FOR SUCH SECURITIES BY SUBMITTING A REQUEST FOR SUCH INFORMATION TO THE CO-ISSUERS AT THE FOLLOWING ADDRESS: C/O SPIRIT AIRLINES, INC., 2800 EXECUTIVE WAY, MIRAMAR, FL 33025, ATTENTION: LEGAL DEPARTMENT.