Document:

EX-10.25

 Exhibit 10.25 

 

			
	

	 	CLIFFORD CHANCE US LLP

 EXECUTION VERSION 

DATED AS OF DECEMBER 22, 2020 

FRONTIER AIRLINES INC. 
 AS
GUARANTOR 
 AND 
 BANK OF UTAH

 NOT IN ITS INDIVIDUAL CAPACITY BUT SOLELY 

AS SECURITY TRUSTEE 
  

 
  

	
	SIXTH AMENDED AND RESTATED GUARANTEE IN RESPECT OF THE PDP FINANCING OF TWENTY TWO (22) AIRBUS A320NEO AIRCRAFT AND TWENTY FOUR (24) AIRBUS A321NEO AIRCRAFT

  
  

 CONTENTS 
  

							
	Clause	  	Page	 
			
	1.	 	Definitions	  	 	1	 
			
	2.	 	Guarantee	  	 	1	 
			
	3.	 	Guarantee Absolute	  	 	2	 
			
	4.	 	Waiver	  	 	5	 
			
	5.	 	Certain Actions	  	 	6	 
			
	6.	 	Subrogation	  	 	6	 
			
	7.	 	Rights of Third Parties; Set-Off	  	 	6	 
			
	8.	 	Representations and Warranties	  	 	7	 
			
	9.	 	Covenants	  	 	8	 
			
	10.	 	Successors and Assigns	  	 	11	 
			
	11.	 	Notices	  	 	11	 
			
	12.	 	Governing Law; Counterparts	  	 	12	 
			
	13.	 	Waiver of Jury Trial	  	 	12	 
			
	14.	 	Jurisdiction	  	 	12	 
			
	15.	 	Service of Process	  	 	13	 

 THIS SIXTH AMENDED AND RESTATED GUARANTEE (as amended, modified or supplemented in accordance with
the terms hereof, this “Guarantee”), dated as of December 22, 2020, is made 
 BY: 

 

	(1)	 FRONTIER AIRLINES, INC., incorporated in Colorado (together with its
successors and its permitted assigns, the “Guarantor”); 

 in favor of 

 

	(2)	 BANK OF UTAH, not in its individual capacity but solely, as security trustee
(in such capacity, the “Security Trustee”) for and on behalf of itself, the Facility Agent (as defined in the Credit Agreement referred to below) and each lender (each a “Lender” and collectively, the
“Lenders”) which is a party to the Sixth Amended and Restated Credit Agreement, dated as of the date hereof (as amended, modified or supplemented from time to time, the “Credit Agreement”), among Vertical Horizons,
Ltd., as borrower (the “Borrower”), the Facility Agent, the Lenders and the Security Trustee. 

WITNESSETH: 
 WHEREAS: 

 

	(A)	 This Guarantee amends and restates in its entirety the Fifth Amended and Restated Guarantee dated as of March
19, 2020, by the Guarantor in favor of the Security Trustee; 

  

	(B)	 The Borrower entered into the Credit Agreement for the purpose of financing certain pre-delivery payment obligations in respect of twenty-two (22) Airbus A320neo and twenty-four (24) Airbus A321neo Aircraft; and 

 

	(C)	 It is a condition precedent to the entering into of the transactions contemplated by the Credit Agreement that
the Guarantor shall have executed and delivered this Guarantee. 

 NOW, THEREFORE, in consideration of the premises and other
consideration, the receipt and sufficiency of which are hereby acknowledged by the Guarantor, the Guarantor hereby agrees as follows: 
  

	1.	 DEFINITIONS 

 

	(a)	 Capitalized terms used and not otherwise defined herein shall have the meaning assigned to such terms in the
Credit Agreement. 

  

	(b)	 Unless the context otherwise requires, any reference herein to any of the Operative Documents refers to such
document as it may be modified, amended or supplemented from time to time in accordance with its terms and the terms of each other agreement restricting the modification, amendment or supplement thereof. 

 

	2.	 GUARANTEE 

 

	(a)	 The Guarantor hereby irrevocably, absolutely and unconditionally guarantees, as primary obligor and as a
guarantor of payment and not merely as surety or guarantor of collection, to the Security Trustee, the Facility Agent and each Lender, (i) the full and 

  
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prompt payment by the Borrower when due of the Secured Obligations incurred by the Borrower and pursuant to the Operative Documents, strictly in accordance with the terms of the Operative
Documents, and (ii) the full and timely performance of, and compliance with, each and every duty, agreement, undertaking, indemnity and obligation of the Borrower under the Operative Documents strictly in accordance with the terms thereof, in
each case, however created, arising or evidenced, whether direct or indirect, primary or secondary, absolute or contingent, joint or several and whether now or hereafter existing or due or to become due (such payment and other obligations described
in paragraphs (i) and (ii) being referred to herein as the “Liabilities”). 

  

	(b)	 The Guarantor further agrees to pay any and all reasonable costs and expenses (including, without limitation,
all reasonable fees and disbursements of counsel) that may be paid or incurred by the Security Trustee, the Facility Agent and/or one or more of the Lenders in enforcing any rights with respect to, or collecting, any or all of the Liabilities or
enforcing any rights with respect to, or collecting against, the Guarantor hereunder together with interest at the Past Due Rate specified in the Credit Agreement from the date when such expenses are so incurred to the date of actual payment
thereof. Without limiting the generality of the foregoing, the liability of the Guarantor hereunder shall extend to all amounts which constitute part of the Liabilities and would be owed by the Borrower but for the fact that such amounts are
unenforceable or not allowable due to any circumstance whatsoever or due to the existence of a bankruptcy, suspension of payments, reorganization or similar proceeding involving the Borrower. 

 

	3.	 GUARANTEE ABSOLUTE 

 

	(a)	 This Guarantee shall constitute a guarantee of payment and of performance and not of collection, and the
Guarantor specifically agrees that it shall not be necessary, and that the Guarantor shall not be entitled to require, before or as a condition of enforcing the obligations of the Guarantor under this Guarantee or requiring payment or performance of
the Liabilities by the Guarantor hereunder, or at any time thereafter, that any Person: (i) file suit or proceed to obtain or assert a claim for personal judgment against the Borrower or any other Person that may be liable for any Liabilities;
(ii) make any other effort to obtain payment or performance of any Liabilities from the Borrower or any other Person that may be liable for such Liabilities; (iii) foreclose against or seek to realize upon the Collateral or any other
security now or hereafter existing for such Liabilities; (iv) exercise or assert any other right or remedy to which such Person is or may be entitled in connection with any Liabilities or any security or other guarantee therefor; or
(v) assert or file any claim against the assets of any other Person liable for any Liabilities. Notwithstanding anything herein to the contrary, no provision of this Guarantee shall require the Guarantor to pay, perform or discharge any
Liabilities prior to the time such Liabilities are due and payable. When making any demand hereunder against the Guarantor, none of the Security Trustee, the Facility Agent or any Lender need make a similar demand on the Borrower; provided that
any failure by the Security Trustee, the Facility Agent or any Lender to make any such demand or to collect any payments from the Borrower shall not relieve the Guarantor of its obligations or liabilities hereunder and shall not impair or affect
the rights and remedies, express or implied, or as a matter of law, of the Security Trustee, the Facility Agent and/or such Lender against the Guarantor. The Security Trustee, the Facility Agent and/or the Lenders may in all events pursue its rights
under this Guarantee prior to or simultaneously with pursuing its various rights referred to in the Credit Agreement and the other Operative Documents, as the Security Trustee, the Facility Agent and/or such Lender may determine.

  
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	(b)	 The Guarantor agrees that this Guarantee shall be continuing until the indefeasible payment in full of all
Secured Obligations and the Guarantor guarantees that the Liabilities will be paid and performed strictly in accordance with the terms of the Operative Documents, regardless of any law, regulation or order now or hereafter in effect in any
jurisdiction affecting any of such terms or the rights of the Security Trustee, the Facility Agent and/or the Lenders with respect thereto. If for any reason the Borrower shall fail to fully and timely pay or perform and discharge any Liabilities to
be paid or performed by the Borrower (whether affirmative or negative in character), the Guarantor shall promptly on demand by the Security Trustee, the Facility Agent and/or any Lender pay or perform or cause to be paid or performed, as the case
may be, such Liabilities. Each of the obligations of the Guarantor under this Guarantee is separate and independent of each other obligation of the Guarantor under this Guarantee and separate and independent of the Liabilities, and the Guarantor
agrees that a separate action or actions may be brought and prosecuted against the Guarantor to enforce this Guarantee, irrespective of whether any action is brought against the Borrower is joined in any such action or actions. The obligations of
the Guarantor shall be continuing and irrevocable, absolute and unconditional, primary and original and immediate and not contingent and shall remain in full force and effect without regard to and not be released, discharged or in any way affected
by any circumstance or condition (other than by payment in full of the Liabilities) including, without limitation, the occurrence of any one or more of the following: 

 

	 	(i)	 any lack of validity or enforceability of any of the Liabilities under the Operative Documents or any document
entered into in connection with the transactions contemplated thereby, any provision thereof, or any other agreement or instrument relating thereto or the absence of any action to enforce the same; 

 

	 	(ii)	 any failure, omission, delay or lack on the part of the Security Trustee, the Facility Agent and/or the Lenders
to enforce, assert or exercise any right, power, privilege or remedy conferred on the Security Trustee, the Facility Agent and/or the Lenders in the Credit Agreement, the Security Agreement, or any other Operative Document, or the inability of the
Security Trustee, the Facility Agent and/or the Lenders to enforce any provision of any Operative Document for any reason, or any other act or omission on the part of the Security Trustee, the Facility Agent or any Lender; 

 

	 	(iii)	 any change in the time, manner or place of performance or of payment, or in any other term of, all or any of
the Liabilities, or any other modification, supplement, amendment or waiver of or any consent to departure from the terms and conditions of any of the Operative Document or any document entered into in connection with the transactions contemplated
thereby; 

  

	 	(iv)	 any taking, exchange, release or non-perfection of the Collateral or
any other collateral or security, or any taking, release or amendment or waiver of or consent to departure from any other guarantee, for all or any of the Liabilities or the acceptance of any security therefor; 

  
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	 	(v)	 the waiver by the Security Trustee, the Facility Agent and/or any Lender of the performance or observance by
the Borrower of any of the Liabilities, the waiver of any default in the performance or observance thereof, any extension by the Security Trustee, the Facility Agent and/or any Lender of the time for payment or performance and discharge by the
Borrower of any Liabilities or any extension, indulgence or renewal of any Liabilities; 

  

	 	(vi)	 any bankruptcy, suspension of payments, insolvency, sale of assets,
winding-up, dissolution, liquidation, receivership or reorganization of, or similar proceedings involving, the Borrower or its assets or any resulting release or discharge of any of the Liabilities;

  

	 	(vii)	 the recovery of any judgment against any Person or any action to enforce the same; 

 

	 	(viii)	 any failure or delay in the enforcement of the Liabilities of any Person under the Operative Documents or any
document entered into in connection with the transactions contemplated by the Operative Documents or any provision thereof; 

  

	 	(ix)	 any set-off, counterclaim, deduction, defense, abatement, suspension,
deferment, diminution, recoupment, limitation or termination available with respect to any Liabilities and, to the extent permitted by applicable law, irrespective of any other circumstances that might otherwise limit recourse by or against the
Guarantor or any other Person; 

  

	 	(x)	 the obtaining, the amendment or the release of or consent to any departure from the primary or secondary
obligation of any other Person, in addition to the Guarantor, with respect to any Liabilities; 

  

	 	(xi)	 any compromise, alteration, amendment, modification, extension, renewal, release or other change, or waiver,
consent or other action, or delay or omission or failure to act, in respect of any of the terms, covenants or conditions of any Operative Document or any document entered into in connection with the transactions contemplated by any Operative
Document, or any other agreement or any related document referred to therein, or any assignment or transfer of any thereof; 

  

	 	(xii)	 any manner of application of Collateral or Proceeds thereof, to all or any of the Liabilities, or any manner of
sale or other disposition of any Collateral, or any furnishing or acceptance of additional collateral; 

  

	 	(xiii)	 any change in control in the ownership of the Borrower, any change, merger, demerger, consolidation,
restructuring or termination of the corporate structure or existence of the Borrower; 

  

	 	(xiv)	 to the fullest extent permitted by applicable law, any other circumstance which might otherwise constitute a
defense available to, or a discharge of, a guarantor or surety with respect to any Liabilities; 

  

	 	(xv)	 any default, failure or delay, whether as a result of actual or alleged force majeure, commercial
impracticability or otherwise, in the performance of the 

  
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Liabilities, or by any other act or circumstances which may or might in any manner or to any extent vary the risk of the Guarantor, or which would otherwise operate as a discharge of the
Guarantor; 

  

	 	(xvi)	 the existence of any other obligation of the Guarantor, or any limitation thereof, in any Operative Document;

  

	 	(xvii)	 any regulatory change or other governmental action (whether or not adverse); or 

 

	 	(xviii)	 the partial payment or performance of the Liabilities (whether as a result of the exercise of any right,
remedy, power or privilege or otherwise) or the invalidity of any payment for any reason whatsoever. 

 Should any money
due or owing under this Guarantee not be recoverable from the Guarantor due to any of the matters specified in paragraphs (i) through (xviii) above or for any other reason, then, in any such case, such money shall nevertheless be recoverable
from the Guarantor as though the Guarantor were principal debtor in respect thereof and not merely a guarantor and shall be paid by the Guarantor forthwith. 
  

	(c)	 This Guarantee shall continue to be effective or be automatically reinstated, as the case may be, if at any
time any payment, or any part thereof, of any of the Liabilities is rescinded or must otherwise be restored or returned by the Security Trustee, the Facility Agent and/or any Lender for any reason whatsoever, whether upon the insolvency, bankruptcy,
dissolution, liquidation or reorganization of the Borrower or otherwise, all as though such payment had not been made, and the Guarantor agrees that it will indemnify the Security Trustee, the Facility Agent and each Lender on demand for all
reasonable costs and expenses (including, without limitation, fees and disbursement of counsel) incurred by any such Person in connection with such rescission or restoration. If an event permitting the exercise of remedies under the Operative
Documents shall at any time have occurred and be continuing and such exercise, or any consequences thereof provided in any Operative Document, shall at such time be prevented by reason of the pendency against the Borrower of a case or proceeding
under a bankruptcy or insolvency law, the Guarantor agrees that, for purposes of this Guarantee and its obligations hereunder, amounts payable under the Operative Documents shall be deemed to have been declared in default, with all attendant
consequences as provided in the Operative Documents as if such declaration of default and the consequences thereof had been accomplished in accordance with the terms of the Credit Agreement and the other Operative Documents, and the Guarantor shall
forthwith pay any amounts guaranteed hereunder, without further notice or demand. 

  

	4.	 WAIVER 

To the fullest extent permitted by applicable law, the Guarantor hereby expressly and irrevocably waives diligence, promptness, demand for
payment or performance, filing of claims with any court, any proceeding to enforce any provision of the Operative Documents, notice of acceptance of and reliance on this Guarantee by the Security Trustee, the Facility Agent and each Lender, notice
of the creation of any liabilities of the Borrower, any requirement that the Security Trustee, the Facility Agent or any Lender protect, secure, perfect or insure any security interest or Lien on the Collateral or any property subject thereto, any
right to require a proceeding first against the 

  
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Borrower, whether to marshal any assets or to exhaust any right or take any action against the Borrower or any other Person or entity or any collateral or otherwise, any diligence in collection
or protection of or realization upon any Liabilities, any obligation hereunder or any collateral security for any of the foregoing, any right of protest, presentment, notice or demand whatsoever, all claims of waiver, release, surrender, alteration
or compromise, and all defenses, set-offs, counterclaims, recoupments, reductions, limitations, impairments or terminations, whether arising hereunder or otherwise. 

 

	5.	 CERTAIN ACTIONS 

The Security Trustee, the Facility Agent and each Lender may, from time to time at its sole discretion and without notice to the Guarantor,
take any or all of the following actions without affecting the obligations of the Guarantor hereunder: (i) retain or obtain a lien upon a security interest in any substitutions or replacements to the Collateral; (ii) retain or obtain the
primary or secondary obligation of any obligor or obligors, in addition to the Guarantor, with respect to any of the Liabilities or any obligation hereunder; (iii) with consent of the Borrower, extend or renew for one or more periods
(regardless of whether longer than the original period), alter or exchange any of the Liabilities, or release or compromise any obligation of the Guarantor hereunder or any obligation of any nature of any other obligor (including the Security
Trustee) with respect to any of the Liabilities; (iv) release or fail to perfect any Lien upon or security interest in, or impair, surrender, release or permit any substitution or exchange for, all or any part of any property securing any of
the Liabilities or any obligation hereunder, or extend or renew for one or more periods (regardless of whether longer than the original period) or release, compromise, alter or exchange any obligations of any nature of any obligor with respect to
any such property; and (v) resort to the Guarantor for payment of any of the Liabilities, regardless of whether the Security Trustee, the Facility Agent or the Lender, as the case may be, shall have resorted to any property securing any of the
Liabilities or any obligation hereunder or shall have proceeded against any other obligor primarily or secondarily obligated with respect to any of the Liabilities. 
  

	6.	 SUBROGATION 

Any amounts received by the Security Trustee, the Facility Agent or any Lender from whatsoever source on account of the Liabilities may be
applied by it toward the payment of such of the Liabilities, and in such order of application, as the Security Trustee, the Facility Agent or such Lender may from time to time elect. No payment made by or for the account of the Guarantor pursuant to
this Guarantee shall entitle the Guarantor by subrogation, indemnity or otherwise to any payment by the Security Trustee, the Facility Agent or the Lender, as the case may be, from or out of any property of such Person, and the Guarantor shall not
exercise any right or remedy against the Security Trustee, the Facility Agent or the Lender, as the case may be, or any property of such Person by reason of any performance by the Guarantor of this Guarantee. 

 

	7.	 RIGHTS OF THIRD PARTIES; SET-OFF

  

	(a)	 This Guarantee is made only for the benefit of, and shall be enforceable only by, the Security Trustee, the
Facility Agent and each Lender, and this Guarantee shall not be 

  
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construed to create any right in any Person other than the Security Trustee, the Facility Agent and each Lender to be a contract in whole or in part for the benefit of any Person other than the
Security Trustee, the Facility Agent and each Lender. 

  

	(b)	 Upon the occurrence of any Event of Default, the Guarantor hereby irrevocably authorizes the Security Trustee,
the Facility Agent, each Lender and each of their respective Affiliates, at any time and from time to time without notice to the Guarantor, any such notice being expressly waived by the Guarantor, to set-off
and appropriate and apply any and all assets, at any time held or owing by the Guarantor or any of its Affiliates to, or for the credit of the account of the Guarantor, or any part thereof in such amounts as the Security Trustee, the Facility Agent
or such Lender, as the case may be, may elect, against and on account of the obligations and liabilities of the Guarantor to the Security Trustee, the Facility Agent and each Lender hereunder of every nature and description of the Security Trustee,
the Facility Agent and each Lender. The Security Trustee, the Facility Agent or applicable Lender shall notify the Guarantor promptly of any such set-off and the application made by them, provided that
the failure to give such notice shall not affect the validity of such set-off and application. The rights of the Security Trustee, the Facility Agent and each Lender under this Clause are in addition to
other rights and remedies (including, without limitation, other rights of set-off) which the Security Trustee, the Facility Agent and the Lenders may have. 

 

	8.	 REPRESENTATIONS AND WARRANTIES 

The Guarantor represents and warrants to the Security Trustee, the Facility Agent and each Lender as follows: 

 

	(a)	 Access to Information 

The Guarantor has and will continue to have independent means of obtaining information concerning the Borrower’s affairs, financial
condition and business. None of the Security Trustee, the Facility Agent or any Lender shall have any duty or responsibility to provide the Guarantor with any credit or other information concerning the Borrower’s affairs, financial condition or
business which may come into the possession of the Security Trustee, the Facility Agent or any Lender. 
  

	(b)	 Organization 

It is a company duly organized and validly existing under the laws of the state of Colorado, with organizational power and authority to own its
properties and to conduct its business as such properties are presently owned and such business is presently conducted. 
  

	(c)	 Due Qualification 

It is duly licensed, qualified and authorized to do business and is in good standing in each jurisdiction where the ownership, leasing or
operation of its property or the conduct of its business requires such license, qualification or authorization except for failures to be so qualified which, individually or in the aggregate, could not reasonably be expected to have a material
adverse effect on the business, operations, property, assets, liabilities, financial condition or prospects of the Guarantor. 

  
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	(d)	 Power and Authority; Due Authorization 

It has (i) all necessary power, authority and legal right to execute, deliver and perform its obligations under this Guarantee and
(ii) duly authorized by all necessary organizational action such execution, delivery and performance of this Guarantee. 
  

	(e)	 Binding Obligations 

This Guarantee constitutes the legal, valid and binding obligation of the Guarantor, enforceable in accordance with its terms, except as
enforceability may be limited by bankruptcy, insolvency, reorganization or other similar laws affecting the enforcement of creditors’ rights generally and by general principles of equity, regardless of whether such enforceability is considered
in a proceeding in equity or at law. 
  

	(f)	 No Violation 

The execution, delivery and performance of this Guarantee will not (i) conflict with, or result in any breach of any of the terms and
provisions of, or constitute (with or without notice or lapse of time or both) a default under (A) the constituent documents of the Guarantor or (B) any indenture, lease, loan agreement, receivables purchase agreement, mortgage, deed of
trust, or other agreement or instrument to which the Guarantor is a party or by which it or its property is bound, (ii) result in or require the creation or imposition of any Lien upon any of its properties pursuant to the terms of any such
indenture, lease, loan agreement, receivables purchase agreement, mortgage, deed of trust, or other agreement or instrument or (iii) violate any law, judgment, writ, injunction, decree or any order, rule, regulation applicable to the Guarantor
of any court or of any federal, state or foreign regulatory body, administrative agency or other governmental instrumentality having jurisdiction over the Guarantor or any of its properties. 

 

	(g)	 Not Insolvent 

The execution, delivery and performance by the Guarantor of this Guarantee will not render the Guarantor insolvent, nor is it being made in
contemplation of the Guarantor’s insolvency; the Guarantor does not, in its reasonable judgment, have an unreasonably small capital for conducting its business as presently contemplated by it. The Guarantor is fully solvent (on a cash flow and
balance sheet basis) and will be fully solvent immediately following the execution of this Agreement and the other Operative Documents. 
  

	(h)	 No Default under Airbus Purchase Agreements or Engine Agreements 

No event is continuing in respect of the Guarantor which would constitute an incipient or actual default by either Guarantor under any Airbus
Purchase Agreement, the A321neo Engine Purchase Agreement or the CFM Engine Agreement A320neo. 
  

	9.	 COVENANTS 

 

	(a)	 The Guarantor shall observe certain policies and procedures relating to the Borrower’s existence as
separate companies as follows and shall do all things necessary to maintain its corporate existence separate and distinct from the Borrower. The Guarantor shall: 

  
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	 	(i)	 observe all formalities necessary to remain a legal entity separate and distinct from the Borrower;

  

	 	(ii)	 maintain its assets and liabilities separate and distinct from those of the Borrower in such a manner that it
is not difficult to segregate, identify or ascertain such assets; 

  

	 	(iii)	 maintain records, books and accounts separate from those of the Borrower (other than as otherwise set forth
under the Operative Documents); 

  

	 	(iv)	 pay its obligations in the ordinary course of business as a legal entity separate from the Borrower;

  

	 	(v)	 keep its funds separate and distinct from any funds of the Borrower, and receive, deposit, withdraw and
disburse such funds separately from any funds of the Borrower; 

  

	 	(vi)	 not agree to pay, assume, guarantee or become liable for any debt of, or otherwise pledge its assets for the
benefit of the Borrower except as otherwise permitted under the Operative Documents; 

  

	 	(vii)	 not hold out that the Borrower is a division of the Guarantor or any other Person or that the Guarantor is a
division of the Borrower or any other Person; 

  

	 	(viii)	 not induce any third party to rely on the creditworthiness of the Guarantor in order that such third party will
contract with the Borrower (other than any guarantee of the Guarantor in favor of Airbus made in connection with the Airbus Purchase Agreements); 

  

	 	(ix)	 allocate and charge fairly and reasonably any common overhead shared with the Borrower; 

 

	 	(x)	 hold itself out as a separate entity from the Borrower, and correct any known misunderstanding regarding its
separate identity; 

  

	 	(xi)	 not conduct business in the name of the Borrower and ensure that all communications of the Borrower are made
solely in the Borrower’s name as the context may require; 

  

	 	(xii)	 not acquire the securities of the Borrower or allow the Borrower to acquire securities of the Guarantor;

  

	 	(xiii)	 prepare separate financial statements and separate tax returns from the Borrower (provided
that the Guarantor may publish financial statements that consolidate those of the Guarantor and its subsidiaries, if to do so is required by any applicable law or accounting principles from time to time in effect and subsidiaries
of the Guarantor may file consolidated Tax returns with the Guarantor and its subsidiaries for Tax purposes); and 

  

	 	(xiv)	 not enter into any transaction with the Borrower that is more favorable to the Guarantor than transactions that
the Guarantor and its subsidiaries would have been able to enter into at such time on an arm’s-length basis with a non-affiliated third party or vice versa.

  
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	(b)	 The Guarantor shall not take any action or omit to take any action that would cause an incipient or actual
default under any Airbus Purchase Agreement or any Engine Agreement. 

  

	(c)	 The Guarantor shall ensure that the Servicing Agreement, the Option Agreement, the Subordinated Loan Agreement,
and this Guarantee remain in place and in full force and effect and that neither it nor any other Obligor shall breach any of the terms of any of such documents. The Guarantor shall ensure that no amendment, variation, waiver or other change is made
to its memorandum and articles of association or other constituent documents, the Servicing Agreement, the Option Agreement, the Subordinated Loan Agreement, or this Guarantee. 

 

	(d)	 The Guarantor shall: 

 

	 	(i)	 promptly upon acquiring actual knowledge of the same, notify the Facility Agent of any default (whether by the
Guarantor, any Affiliate of the Guarantor, Airbus or the Engine Manufacturer) under or cancellation, termination or rescission or purported cancellation, termination or rescission of any Airbus Purchase Agreement or any Engine Agreement specifying
in reasonable detail the nature of such default, cancellation, rescission or termination; 

  

	 	(ii)	 not, without the Security Trustee’s prior written consent, in any way modify, cancel, terminate or amend
or consent to the modification, cancellation, termination or amendment of any Airbus Purchase Agreement or any Engine Agreement except to the extent permitted by the Credit Agreement; 

 

	 	(iii)	 not accept, and shall procure that the Borrower or any other Person does not accept, delivery of any Aircraft
from Airbus before or concurrently with repaying to the Lenders all amounts owing in respect of the Loans relating to that Aircraft; 

  

	 	(iv)	 not enter into or consent to any change order or other amendment, modification or supplement to any Airbus
Purchase Agreement or any Engine Agreement, in relation to the Aircraft, without the prior written consent and countersignature of the Security Trustee (acting at the unanimous direction of the Lenders) if such change order, amendment, modification
or supplement would require the consent of the Security Trustee under the Step-In Agreement or under the Credit Agreement; 

 

	 	(v)	 provide to the Security Trustee promptly after the execution of the same copies, certified by the Guarantor, of
all material change orders (other than non charge change orders), amendments, modifications or supplements to the Assigned Purchase Agreements that would require the consent of the Security Trustee under the
Step-In Agreement or under the Credit Agreement; 

  

	 	(vi)	 provide to the Security Trustee promptly upon request, such information regarding the package of product
support and training services as was agreed to be provided by Airbus to the Guarantor under the Assigned Purchase 

  
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Agreements and agrees not to take any action or omit to take any action which would reduce the product support and training services which would otherwise be available to Intrepid by Airbus with
respect to the Aircraft under the Assigned Purchase Agreements; and 

  

	 	(vii)	 not agree to any financial indebtedness cross default (in respect of it or any of its Affiliates) with Airbus
that would give rise to a right for Airbus to terminate the Assigned Purchase Agreements. 

  

	(e)	 The Guarantor shall not accept any repayment of any part of the Subordinated Loan Agreement while the Secured
Obligations remain outstanding. 

  

	10.	 SUCCESSORS AND ASSIGNS 

 

	(a)	 This Guarantee shall be binding upon the Guarantor and upon the Guarantor’s successors and assigns and all
references herein to the Guarantor or the Security Trustee shall be deemed to include any successor or successors whether immediate or remote, to such Person. The Guarantor shall not assign any of its rights or obligations hereunder without the
prior written consent of the Security Trustee, the Facility Agent and each Lender. 

  

	(b)	 This Guarantee shall inure to the benefit of the Security Trustee, the Facility Agent each Lender and their
respective successors and assigns, and all references herein to the Security Trustee, the Facility Agent or any Lender shall be deemed to include any successors and assigns of such Person (whether or not reference in a particular provision is made
to such successors and assigns). 

  

	11.	 NOTICES 

All notices, demands or requests given pursuant to this Guarantee shall be in writing personally delivered, or sent by facsimile (with
subsequent telephone confirmation of receipt thereof) or sent by internationally recognized overnight courier service, to the following addresses: 
  

	(a)	 if to the Guarantor: 

Frontier Airlines, Inc. 
 7001
Tower Road 
 Denver, CO 80249 

Attention: SVP – General Counsel 

Phone: (###) ###-#### 
 Email: ###

  

	(b)	 if to the Security Trustee: 

50 South 200 East, Suite 110 

Salt Lake City, Utah 84111 

Telephone: ### ###-#### 

Facsimile: ### ###-#### 
 Email:
### 

  
 - 11- 

 Whenever any notice in writing is required to be given by the Guarantor or the Security
Trustee, such notice shall be deemed given and such requirement satisfied when such notice is received, with such notice received if such notice is mailed by certified mail, postage prepaid, or is sent by facsimile, addressed as provided above. 

Either party hereto may change the address to which notices to such party will be sent by giving notice of such change to the other party. 

 

	12.	 GOVERNING LAW; COUNTERPARTS 

THIS GUARANTEE SHALL IN ALL RESPECTS BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAW OF THE STATE OF NEW YORK, INCLUDING ALL MATTERS
OF CONSTRUCTION, VALIDITY AND PERFORMANCE. This Guarantee may be executed by the parties hereto in separate counterparts, each of which when so executed and delivered shall be an original, but all such counterparts shall together constitute but one
and the same instrument. 
  

	13.	 WAIVER OF JURY TRIAL 

EACH PARTY WAIVES, TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, ANY RIGHT IT MAY HAVE TO A TRIAL BY JURY IN ANY LEGAL PROCEEDING DIRECTLY
OR INDIRECTLY ARISING OUT OF OR RELATING TO THIS GUARANTEE OR THE TRANSACTIONS CONTEMPLATED HEREBY (WHETHER BASED ON CONTRACT, TORT OR ANY OTHER THEORY). EACH PARTY HERETO (A) CERTIFIES THAT NO REPRESENTATIVE, AGENT OR ATTORNEY OF ANY OTHER
PARTY HAS REPRESENTED, EXPRESSLY OR OTHERWISE, THAT SUCH OTHER PARTY WOULD NOT, IN THE EVENT OF LITIGATION, SEEK TO ENFORCE THE FOREGOING WAIVER AND (B) ACKNOWLEDGES THAT IT AND THE OTHER PARTIES HERETO HAVE BEEN INDUCED TO ENTER INTO THIS
GUARANTEE BY, AMONG OTHER THINGS, THE MUTUAL WAIVERS AND CERTIFICATIONS IN THIS CLAUSE. 
  

	14.	 JURISDICTION 

 

	(a)	 The Guarantor hereby irrevocably and unconditionally submits, for itself and its property, to the non-exclusive jurisdiction of the Supreme Court of the State of New York sitting in New York County and of the United States District Court of the Southern District of New York, and any appellate court from any
thereof, in any action or proceeding arising out of or relating to this Guarantee, or for recognition or enforcement of any judgment, and the Guarantor irrevocably and unconditionally agrees that all claims in respect of any such action or
proceeding may be heard and determined in such New York State or, to the extent permitted by law, in such Federal court. The Guarantor agrees that a final judgment in any such action or proceeding shall be conclusive and may be enforced in other
jurisdictions by suit on the judgment or in any other manner provided by law. Nothing in this Guarantee shall affect any right that the Security Trustee or any Lender may otherwise have to bring any action or proceeding relating to this Guarantee
against another party or its properties in the courts of any jurisdiction. 

  

	(b)	 The Guarantor irrevocably and unconditionally waives, to the fullest extent it may legally and effectively do
so, any objection which it may now or hereafter have to the 

  
 - 12- 

	 	
laying of venue of any suit, action or proceeding arising out of or relating to this Guarantee in any court referred to in paragraph (a) of this Clause. The Guarantor hereby irrevocably
waives, to the fullest extent permitted by law, the defense of an inconvenient forum to the maintenance of such action or proceeding in any such court. 

  

	15.	 SERVICE OF PROCESS 

Each party to this Guarantee irrevocably consents to service of process in the manner provided for the delivery of notices in Clause 11.
Nothing in this Guarantee will affect the right of any party to this Guarantee to serve process in any other manner permitted by law. The Guarantor hereby irrevocably appoints and designates Corporation Services Company (the “Agent for
Service of Process”), having an address at Corporation Service Company, 80 State Street, Albany, New York 12207-2543, as its true and lawful attorney-in-fact
and duly authorized agent for the limited purpose of accepting service of legal process and the Guarantor agrees that service of process upon such party shall constitute personal service of such process on such person. The Guarantor shall maintain
the designation and appointment of the Agent for Service of Process at such address until all amounts payable under this Guarantee shall have been paid in full. If the Agent for Service of Process shall cease to so act, the Guarantor shall
immediately designate and shall promptly deliver to the Security Trustee evidence in writing of acceptance by another agent for service of process of such appointment, which such other agent for service of process shall have an address for receipt
of service of process in the State of New York and the provisions above shall equally apply to such other agent for service of process. 

[Signature page follows] 

  
 - 13- 

 IN WITNESS WHEREOF, this Guarantee has been executed and delivered by the Guarantor’s duly
authorized officer as of the date first written above. 
  

			
	FRONTIER AIRLINES, INC.
		
	By:	 	 /s/ Howard Diamond

		 	Name: Howard Diamond
		 	Title: Senior Vice President, General Counsel and Secretary

 ACCEPTED and AGREED: 

BANK OF UTAH 
 not in its individual capacity but solely

 as Security Trustee 
  

			
	By:	 	 /s/ Joseph H. Pugsley

		 	Name: Joseph H. Pugsley
		 	Title: Vice President
		
	By:	 	 /s/ Michael Arsenault

		 	Name: Michael Arsenault
		 	Title: Vice President

  
 [Signature Page - Sixth
Amended and Restated Guarantee]EX-10.26

 [***] Certain information in this document has been excluded pursuant to Regulation S-K, Item 601(b)(10). 
 Such excluded information is not material and would likely cause competitive harm to the
registrant if publicly disclosed. 
 Exhibit 10.26 
  

			
	

	  	CLIFFORD CHANCE US LLP

 EXECUTION VERSION 

DATED AS OF DECEMBER 22, 2020 

FRONTIER AIRLINES HOLDINGS, INC. 

AS GUARANTOR 
 AND 

BANK OF UTAH 
 NOT IN ITS
INDIVIDUAL CAPACITY BUT SOLELY 
 AS SECURITY TRUSTEE 
  

 
  

	
	SIXTH AMENDED AND RESTATED GUARANTEE IN RESPECT OF THE PDP FINANCING OF TWENTY-TWO (22) AIRBUS A320NEO AIRCRAFT AND TWENTY-FOUR (24) AIRBUS A321NEO AIRCRAFT

  
  

			
	 CONTENTS

 

	Clause	  	Page

  

							
	 1.
	  	Definitions	  	 	1	 
			
	 2.
	  	Guarantee	  	 	1	 
			
	 3.
	  	Guarantee Absolute	  	 	2	 
			
	 4.
	  	Waiver	  	 	5	 
			
	 5.
	  	Certain Actions	  	 	6	 
			
	 6.
	  	Subrogation	  	 	6	 
			
	 7.
	  	Rights of Third Parties; Set-Off	  	 	6	 
			
	 8.
	  	Representations and Warranties	  	 	7	 
			
	 9.
	  	Covenants	  	 	9	 
			
	 10.
	  	Successors and Assigns	  	 	12	 
			
	 11.
	  	Notices	  	 	12	 
			
	 12.
	  	Governing Law; Counterparts	  	 	13	 
			
	 13.
	  	Waiver of Jury Trial	  	 	13	 
			
	 14.
	  	Jurisdiction	  	 	13	 
			
	 15.
	  	Service of Process	  	 	14	 

 THIS SIXTH AMENDED AND RESTATED GUARANTEE (as amended, modified or supplemented in accordance with
the terms hereof, this “Guarantee”), dated as of December 22, 2020, is made 
 BY: 

 

	(1)	 FRONTIER AIRLINES HOLDINGS, INC., a Delaware corporation (together with its successors and its permitted
assigns, the “Guarantor”); 

 in favor of 

 

	(2)	 BANK OF UTAH, not in its individual capacity but solely, as security trustee (in such capacity,
the “Security Trustee”) for and on behalf of itself, the Facility Agent (as defined in the Credit Agreement referred to below) and each lender (each a “Lender” and collectively, the “Lenders”) which
is a party to the Sixth Amended and Restated Credit Agreement, dated as of the date hereof (as amended, modified or supplemented from time to time, the “Credit Agreement”), among Vertical Horizons, Ltd., as borrower (the
“Borrower”), the Facility Agent, the Lenders and the Security Trustee. 

 WITNESSETH: 

WHEREAS: 
  

	(A)	 This Guarantee amends and restates in its entirety the Fifth Amended and Restated Guarantee dated as of
March 19, 2020, by the Guarantor in favor of the Security Trustee; 

  

	(B)	 The Borrower entered into the Credit Agreement for the purpose of financing certain pre-delivery payment obligations in respect of twenty-two (22) Airbus A320neo and twenty-four (24) Airbus A321neo Aircraft; and 

 

	(C)	 It is a condition precedent to the entering into of the transactions contemplated by the Credit Agreement that
the Guarantor shall have executed and delivered this Guarantee. 

 NOW, THEREFORE, in consideration of the premises and other
consideration, the receipt and sufficiency of which are hereby acknowledged by the Guarantor, the Guarantor hereby agrees as follows: 
  

	1.	 DEFINITIONS 

  

	(a)	 Capitalized terms used and not otherwise defined herein shall have the meaning assigned to such terms in the
Credit Agreement. 

  

	(b)	 Unless the context otherwise requires, any reference herein to any of the Operative Documents refers to such
document as it may be modified, amended or supplemented from time to time in accordance with its terms and the terms of each other agreement restricting the modification, amendment or supplement thereof. 

 

	2.	 GUARANTEE 

  

	(a)	 The Guarantor hereby irrevocably, absolutely and unconditionally guarantees, as primary obligor and as a
guarantor of payment and not merely as surety or guarantor of collection, to the Security Trustee, the Facility Agent and each Lender, (i) the full and 

  
 - 1- 

	 	
prompt payment by the Borrower when due of the Secured Obligations incurred by the Borrower and pursuant to the Operative Documents, strictly in accordance with the terms of the Operative
Documents, and (ii) the full and timely performance of, and compliance with, each and every duty, agreement, undertaking, indemnity and obligation of the Borrower under the Operative Documents strictly in accordance with the terms thereof, in
each case, however created, arising or evidenced, whether direct or indirect, primary or secondary, absolute or contingent, joint or several and whether now or hereafter existing or due or to become due (such payment and other obligations described
in paragraphs (i) and (ii) being referred to herein as the “Liabilities”). 

  

	(b)	 The Guarantor further agrees to pay any and all reasonable costs and expenses (including, without limitation,
all reasonable fees and disbursements of counsel) that may be paid or incurred by the Security Trustee, the Facility Agent and/or one or more of the Lenders in enforcing any rights with respect to, or collecting, any or all of the Liabilities or
enforcing any rights with respect to, or collecting against, the Guarantor hereunder together with interest at the Past Due Rate specified in the Credit Agreement from the date when such expenses are so incurred to the date of actual payment
thereof. Without limiting the generality of the foregoing, the liability of the Guarantor hereunder shall extend to all amounts which constitute part of the Liabilities and would be owed by the Borrower but for the fact that such amounts are
unenforceable or not allowable due to any circumstance whatsoever or due to the existence of a bankruptcy, suspension of payments, reorganization or similar proceeding involving the Borrower. 

 

	3.	 GUARANTEE ABSOLUTE 

 

	(a)	 This Guarantee shall constitute a guarantee of payment and of performance and not of collection, and the
Guarantor specifically agrees that it shall not be necessary, and that the Guarantor shall not be entitled to require, before or as a condition of enforcing the obligations of the Guarantor under this Guarantee or requiring payment or performance of
the Liabilities by the Guarantor hereunder, or at any time thereafter, that any Person: (i) file suit or proceed to obtain or assert a claim for personal judgment against the Borrower or any other Person that may be liable for any Liabilities;
(ii) make any other effort to obtain payment or performance of any Liabilities from the Borrower or any other Person that may be liable for such Liabilities; (iii) foreclose against or seek to realize upon the Collateral or any other
security now or hereafter existing for such Liabilities; (iv) exercise or assert any other right or remedy to which such Person is or may be entitled in connection with any Liabilities or any security or other guarantee therefor; or
(v) assert or file any claim against the assets of any other Person liable for any Liabilities. Notwithstanding anything herein to the contrary, no provision of this Guarantee shall require the Guarantor to pay, perform or discharge any
Liabilities prior to the time such Liabilities are due and payable. When making any demand hereunder against the Guarantor, none of the Security Trustee, the Facility Agent or any Lender need make a similar demand on the Borrower; provided
that any failure by the Security Trustee, the Facility Agent or any Lender to make any such demand or to collect any payments from the Borrower shall not relieve the Guarantor of its obligations or liabilities hereunder and shall not impair or
affect the rights and remedies, express or implied, or as a matter of law, of the Security Trustee, the Facility Agent and/or such Lender against the Guarantor. The Security Trustee, the Facility Agent and/or the Lenders may in all events pursue its
rights under this Guarantee prior to or simultaneously with pursuing its various rights referred to in the Credit Agreement and the other Operative Documents, as the Security Trustee, the Facility Agent and/or such Lender may determine.

  
 - 2- 

	(b)	 The Guarantor agrees that this Guarantee shall be continuing until the indefeasible payment in full of all
Secured Obligations and the Guarantor guarantees that the Liabilities will be paid and performed strictly in accordance with the terms of the Operative Documents, regardless of any law, regulation or order now or hereafter in effect in any
jurisdiction affecting any of such terms or the rights of the Security Trustee, the Facility Agent and/or the Lenders with respect thereto. If for any reason the Borrower shall fail to fully and timely pay or perform and discharge any Liabilities to
be paid or performed by the Borrower (whether affirmative or negative in character), the Guarantor shall promptly on demand by the Security Trustee, the Facility Agent and/or any Lender pay or perform or cause to be paid or performed, as the case
may be, such Liabilities. Each of the obligations of the Guarantor under this Guarantee is separate and independent of each other obligation of the Guarantor under this Guarantee and separate and independent of the Liabilities, and the Guarantor
agrees that a separate action or actions may be brought and prosecuted against the Guarantor to enforce this Guarantee, irrespective of whether any action is brought against the Borrower is joined in any such action or actions. The obligations of
the Guarantor shall be continuing and irrevocable, absolute and unconditional, primary and original and immediate and not contingent and shall remain in full force and effect without regard to and not be released, discharged or in any way affected
by any circumstance or condition (other than by payment in full of the Liabilities) including, without limitation, the occurrence of any one or more of the following: 

 

	 	(i)	 any lack of validity or enforceability of any of the Liabilities under the Operative Documents or any document
entered into in connection with the transactions contemplated thereby, any provision thereof, or any other agreement or instrument relating thereto or the absence of any action to enforce the same; 

 

	 	(ii)	 any failure, omission, delay or lack on the part of the Security Trustee, the Facility Agent and/or the Lenders
to enforce, assert or exercise any right, power, privilege or remedy conferred on the Security Trustee, the Facility Agent and/or the Lenders in the Credit Agreement, the Security Agreement, or any other Operative Document, or the inability of the
Security Trustee, the Facility Agent and/or the Lenders to enforce any provision of any Operative Document for any reason, or any other act or omission on the part of the Security Trustee, the Facility Agent or any Lender; 

 

	 	(iii)	 any change in the time, manner or place of performance or of payment, or in any other term of, all or any of
the Liabilities, or any other modification, supplement, amendment or waiver of or any consent to departure from the terms and conditions of any of the Operative Document or any document entered into in connection with the transactions contemplated
thereby; 

  

	 	(iv)	 any taking, exchange, release or non-perfection of the Collateral or
any other collateral or security, or any taking, release or amendment or waiver of or consent to departure from any other guarantee, for all or any of the Liabilities or the acceptance of any security therefor; 

  
 - 3- 

	 	(v)	 the waiver by the Security Trustee, the Facility Agent and/or any Lender of the performance or observance by
the Borrower of any of the Liabilities, the waiver of any default in the performance or observance thereof, any extension by the Security Trustee, the Facility Agent and/or any Lender of the time for payment or performance and discharge by the
Borrower of any Liabilities or any extension, indulgence or renewal of any Liabilities; 

  

	 	(vi)	 any bankruptcy, suspension of payments, insolvency, sale of assets,
winding-up, dissolution, liquidation, receivership or reorganization of, or similar proceedings involving, the Borrower or its assets or any resulting release or discharge of any of the Liabilities;

  

	 	(vii)	 the recovery of any judgment against any Person or any action to enforce the same; 

 

	 	(viii)	 any failure or delay in the enforcement of the Liabilities of any Person under the Operative Documents or any
document entered into in connection with the transactions contemplated by the Operative Documents or any provision thereof; 

  

	 	(ix)	 any set-off, counterclaim, deduction, defense, abatement, suspension,
deferment, diminution, recoupment, limitation or termination available with respect to any Liabilities and, to the extent permitted by applicable law, irrespective of any other circumstances that might otherwise limit recourse by or against the
Guarantor or any other Person; 

  

	 	(x)	 the obtaining, the amendment or the release of or consent to any departure from the primary or secondary
obligation of any other Person, in addition to the Guarantor, with respect to any Liabilities; 

  

	 	(xi)	 any compromise, alteration, amendment, modification, extension, renewal, release or other change, or waiver,
consent or other action, or delay or omission or failure to act, in respect of any of the terms, covenants or conditions of any Operative Document or any document entered into in connection with the transactions contemplated by any Operative
Document, or any other agreement or any related document referred to therein, or any assignment or transfer of any thereof; 

  

	 	(xii)	 any manner of application of Collateral or Proceeds thereof, to all or any of the Liabilities, or any manner of
sale or other disposition of any Collateral, or any furnishing or acceptance of additional collateral; 

  

	 	(xiii)	 any change in control in the ownership of the Borrower, any change, merger, demerger, consolidation,
restructuring or termination of the corporate structure or existence of the Borrower; 

  

	 	(xiv)	 to the fullest extent permitted by applicable law, any other circumstance which might otherwise constitute a
defense available to, or a discharge of, a guarantor or surety with respect to any Liabilities; 

  

	 	(xv)	 any default, failure or delay, whether as a result of actual or alleged force majeure, commercial
impracticability or otherwise, in the performance of the 

  
 - 4- 

	 	
Liabilities, or by any other act or circumstances which may or might in any manner or to any extent vary the risk of the Guarantor, or which would otherwise operate as a discharge of the
Guarantor; 

  

	 	(xvi)	 the existence of any other obligation of the Guarantor, or any limitation thereof, in any Operative Document;

  

	 	(xvii)	 any regulatory change or other governmental action (whether or not adverse); or 

 

	 	(xviii)	 the partial payment or performance of the Liabilities (whether as a result of the exercise of any right,
remedy, power or privilege or otherwise) or the invalidity of any payment for any reason whatsoever. 

 Should any money
due or owing under this Guarantee not be recoverable from the Guarantor due to any of the matters specified in paragraphs (i) through (xviii) above or for any other reason, then, in any such case, such money shall nevertheless be recoverable
from the Guarantor as though the Guarantor were principal debtor in respect thereof and not merely a guarantor and shall be paid by the Guarantor forthwith. 
  

	(c)	 This Guarantee shall continue to be effective or be automatically reinstated, as the case may be, if at any
time any payment, or any part thereof, of any of the Liabilities is rescinded or must otherwise be restored or returned by the Security Trustee, the Facility Agent and/or any Lender for any reason whatsoever, whether upon the insolvency, bankruptcy,
dissolution, liquidation or reorganization of the Borrower or otherwise, all as though such payment had not been made, and the Guarantor agrees that it will indemnify the Security Trustee, the Facility Agent and each Lender on demand for all
reasonable costs and expenses (including, without limitation, fees and disbursement of counsel) incurred by any such Person in connection with such rescission or restoration. If an event permitting the exercise of remedies under the Operative
Documents shall at any time have occurred and be continuing and such exercise, or any consequences thereof provided in any Operative Document, shall at such time be prevented by reason of the pendency against the Borrower of a case or proceeding
under a bankruptcy or insolvency law, the Guarantor agrees that, for purposes of this Guarantee and its obligations hereunder, amounts payable under the Operative Documents shall be deemed to have been declared in default, with all attendant
consequences as provided in the Operative Documents as if such declaration of default and the consequences thereof had been accomplished in accordance with the terms of the Credit Agreement and the other Operative Documents, and the Guarantor shall
forthwith pay any amounts guaranteed hereunder, without further notice or demand. 

  

	4.	 WAIVER 

To the fullest extent permitted by applicable law, the Guarantor hereby expressly and irrevocably waives diligence, promptness, demand for
payment or performance, filing of claims with any court, any proceeding to enforce any provision of the Operative Documents, notice of acceptance of and reliance on this Guarantee by the Security Trustee, the Facility Agent and each Lender, notice
of the creation of any liabilities of the Borrower, any requirement that the Security Trustee, the Facility Agent or any Lender protect, secure, perfect or insure any security interest or Lien on the Collateral or any property subject thereto, any
right to require a proceeding first against the 

  
 - 5- 

 
Borrower, whether to marshal any assets or to exhaust any right or take any action against the Borrower or any other Person or entity or any collateral or otherwise, any diligence in collection
or protection of or realization upon any Liabilities, any obligation hereunder or any collateral security for any of the foregoing, any right of protest, presentment, notice or demand whatsoever, all claims of waiver, release, surrender, alteration
or compromise, and all defenses, set-offs, counterclaims, recoupments, reductions, limitations, impairments or terminations, whether arising hereunder or otherwise. 

 

	5.	 CERTAIN ACTIONS 

The Security Trustee, the Facility Agent and each Lender may, from time to time at its sole discretion and without notice to the Guarantor,
take any or all of the following actions without affecting the obligations of the Guarantor hereunder: (i) retain or obtain a lien upon a security interest in any substitutions or replacements to the Collateral; (ii) retain or obtain the
primary or secondary obligation of any obligor or obligors, in addition to the Guarantor, with respect to any of the Liabilities or any obligation hereunder; (iii) with consent of the Borrower, extend or renew for one or more periods
(regardless of whether longer than the original period), alter or exchange any of the Liabilities, or release or compromise any obligation of the Guarantor hereunder or any obligation of any nature of any other obligor (including the Security
Trustee) with respect to any of the Liabilities; (iv) release or fail to perfect any Lien upon or security interest in, or impair, surrender, release or permit any substitution or exchange for, all or any part of any property securing any of
the Liabilities or any obligation hereunder, or extend or renew for one or more periods (regardless of whether longer than the original period) or release, compromise, alter or exchange any obligations of any nature of any obligor with respect to
any such property; and (v) resort to the Guarantor for payment of any of the Liabilities, regardless of whether the Security Trustee, the Facility Agent or the Lender, as the case may be, shall have resorted to any property securing any of the
Liabilities or any obligation hereunder or shall have proceeded against any other obligor primarily or secondarily obligated with respect to any of the Liabilities. 
  

	6.	 SUBROGATION 

Any amounts received by the Security Trustee, the Facility Agent or any Lender from whatsoever source on account of the Liabilities may be
applied by it toward the payment of such of the Liabilities, and in such order of application, as the Security Trustee, the Facility Agent or such Lender may from time to time elect. No payment made by or for the account of the Guarantor pursuant to
this Guarantee shall entitle the Guarantor by subrogation, indemnity or otherwise to any payment by the Security Trustee, the Facility Agent or the Lender, as the case may be, from or out of any property of such Person, and the Guarantor shall not
exercise any right or remedy against the Security Trustee, the Facility Agent or the Lender, as the case may be, or any property of such Person by reason of any performance by the Guarantor of this Guarantee. 

 

	7.	 RIGHTS OF THIRD PARTIES; SET-OFF 

 

	(a)	 This Guarantee is made only for the benefit of, and shall be enforceable only by, the Security Trustee, the
Facility Agent and each Lender, and this Guarantee shall not be 

  
 - 6- 

	 	
construed to create any right in any Person other than the Security Trustee, the Facility Agent and each Lender to be a contract in whole or in part for the benefit of any Person other than the
Security Trustee, the Facility Agent and each Lender. 

  

	(b)	 Upon the occurrence of any Event of Default, the Guarantor hereby irrevocably authorizes the Security Trustee,
the Facility Agent, each Lender and each of their respective Affiliates, at any time and from time to time without notice to the Guarantor, any such notice being expressly waived by the Guarantor, to set-off
and appropriate and apply any and all assets, at any time held or owing by the Guarantor or any of its Affiliates to, or for the credit of the account of the Guarantor, or any part thereof in such amounts as the Security Trustee, the Facility Agent
or such Lender, as the case may be, may elect, against and on account of the obligations and liabilities of the Guarantor to the Security Trustee, the Facility Agent and each Lender hereunder of every nature and description of the Security Trustee,
the Facility Agent and each Lender. The Security Trustee, the Facility Agent or applicable Lender shall notify the Guarantor promptly of any such set-off and the application made by them, provided that
the failure to give such notice shall not affect the validity of such set-off and application. The rights of the Security Trustee, the Facility Agent and each Lender under this Clause are in addition to other
rights and remedies (including, without limitation, other rights of set-off) which the Security Trustee, the Facility Agent and the Lenders may have. 

 

	8.	 REPRESENTATIONS AND WARRANTIES 

The Guarantor represents and warrants to the Security Trustee, the Facility Agent and each Lender as follows: 

 

	(a)	 Access to Information 

The Guarantor has and will continue to have independent means of obtaining information concerning the Borrower’s affairs, financial
condition and business. None of the Security Trustee, the Facility Agent or any Lender shall have any duty or responsibility to provide the Guarantor with any credit or other information concerning the Borrower’s affairs, financial condition or
business which may come into the possession of the Security Trustee, the Facility Agent or any Lender. 
  

	(b)	 Organization 

It is a company duly organized and validly existing under the laws of the state of Delaware, with organizational power and authority to own its
properties and to conduct its business as such properties are presently owned and such business is presently conducted. 
  

	(c)	 Due Qualification 

It is duly licensed, qualified and authorized to do business and is in good standing in each jurisdiction where the ownership, leasing or
operation of its property or the conduct of its business requires such license, qualification or authorization except for failures to be so qualified which, individually or in the aggregate, could not reasonably be expected to have a material
adverse effect on the business, operations, property, assets, liabilities, financial condition or prospects of the Guarantor. 

  
 - 7- 

	(d)	 Power and Authority; Due Authorization 

It has (i) all necessary power, authority and legal right to execute, deliver and perform its obligations under this Guarantee and
(ii) duly authorized by all necessary organizational action such execution, delivery and performance of this Guarantee. 
  

	(e)	 Binding Obligations 

This Guarantee constitutes the legal, valid and binding obligation of the Guarantor, enforceable in accordance with its terms, except as
enforceability may be limited by bankruptcy, insolvency, reorganization or other similar laws affecting the enforcement of creditors’ rights generally and by general principles of equity, regardless of whether such enforceability is considered
in a proceeding in equity or at law. 
  

	(f)	 No Violation 

The execution, delivery and performance of this Guarantee will not (i) conflict with, or result in any breach of any of the terms and
provisions of, or constitute (with or without notice or lapse of time or both) a default under (A) the constituent documents of the Guarantor or (B) any indenture, lease, loan agreement, receivables purchase agreement, mortgage, deed of
trust, or other agreement or instrument to which the Guarantor is a party or by which it or its property is bound, (ii) result in or require the creation or imposition of any Lien upon any of its properties pursuant to the terms of any such
indenture, lease, loan agreement, receivables purchase agreement, mortgage, deed of trust, or other agreement or instrument or (iii) violate any law or any judgment, writ, injunction, decree, order, rule, regulation applicable to the Guarantor
of any court or of any federal, state or foreign regulatory body, administrative agency or other governmental instrumentality having jurisdiction over the Guarantor or any of its properties. 

 

	(g)	 Not Insolvent 

The execution, delivery and performance by the Guarantor of this Guarantee will not render the Guarantor insolvent, nor is it being made in
contemplation of the Guarantor’s insolvency; the Guarantor does not, in its reasonable judgment, have an unreasonably small capital for conducting its business as presently contemplated by it. The Guarantor is fully solvent (on a cash flow and
balance sheet basis) and will be fully solvent immediately following the execution of this Agreement and the other Operative Documents. 
  

	(h)	 No Default under Airbus Purchase Agreements or Engine Agreements 

No event is continuing in respect of the Guarantor which would constitute an incipient or actual default by either Guarantor under any Airbus
Purchase Agreement, the A321neo Engine Purchase Agreement or the CFM Engine Agreement A320neo. 

  
 - 8- 

	9.	 COVENANTS 

  

	(a)	 The Guarantor shall observe certain policies and procedures relating to the Borrower’s existence as
separate companies as follows and shall do all things necessary to maintain its corporate existence separate and distinct from the Borrower. The Guarantor shall: 

 

	 	(i)	 observe all formalities necessary to remain a legal entity separate and distinct from the Borrower;

  

	 	(ii)	 maintain its assets and liabilities separate and distinct from those of the Borrower in such a manner that it
is not difficult to segregate, identify or ascertain such assets; 

  

	 	(iii)	 maintain records, books and accounts separate from those of the Borrower (other than as otherwise set forth
under the Operative Documents); 

  

	 	(iv)	 pay its obligations in the ordinary course of business as a legal entity separate from the Borrower;

  

	 	(v)	 keep its funds separate and distinct from any funds of the Borrower, and receive, deposit, withdraw and
disburse such funds separately from any funds of the Borrower; 

  

	 	(vi)	 not agree to pay, assume, guarantee or become liable for any debt of, or otherwise pledge its assets for the
benefit of the Borrower except as otherwise permitted under the Operative Documents; 

  

	 	(vii)	 not hold out that the Borrower is a division of the Guarantor or any other Person or that the Guarantor is a
division of the Borrower or any other Person; 

  

	 	(viii)	 not induce any third party to rely on the creditworthiness of the Guarantor in order that such third party will
contract with the Borrower (other than any guarantee of the Guarantor in favor of Airbus made in connection with the Airbus Purchase Agreements); 

  

	 	(ix)	 allocate and charge fairly and reasonably any common overhead shared with the Borrower; 

 

	 	(x)	 hold itself out as a separate entity from the Borrower, and correct any known misunderstanding regarding its
separate identity; 

  

	 	(xi)	 not conduct business in the name of the Borrower and ensure that all communications of the Borrower are made
solely in the Borrower’s name as the context may require; 

  

	 	(xii)	 not acquire the securities of the Borrower or allow the Borrower to acquire securities of the Guarantor;

  

	 	(xiii)	 prepare separate financial statements and separate tax returns from the Borrower (provided that the
Guarantor may publish financial statements that consolidate those of the Guarantor and its subsidiaries, if to do so is required by any applicable law or accounting principles from time to time in effect and subsidiaries of the Guarantor may file
consolidated Tax returns with the Guarantor and its subsidiaries for Tax purposes); and 

  
 - 9- 

	 	(xiv)	 not enter into any transaction with the Borrower that is more favorable to the Guarantor than transactions that
the Guarantor and its subsidiaries would have been able to enter into at such time on an arm’s-length basis with a non-affiliated third party or vice versa.

  

	(b)	 The Guarantor shall not take any action or omit to take any action that would cause an incipient or actual
default under any Airbus Purchase Agreement or any Engine Agreement. 

  

	(c)	 The Guarantor shall ensure that the Servicing Agreement, the Option Agreement, the Subordinated Loan Agreement,
and this Guarantee remain in place and in full force and effect and that neither it nor any other Obligor shall breach any of the terms of any of such documents. The Guarantor shall ensure that no amendment, variation, waiver or other change is made
to its memorandum and articles of association or other constituent documents, the Servicing Agreement, the Option Agreement, the Subordinated Loan Agreement, or this Guarantee. 

 

	(d)	 The Guarantor shall: 

 

	 	(i)	 promptly upon acquiring actual knowledge of the same, notify the Facility Agent of any default (whether by the
Guarantor, any Affiliate of the Guarantor, Airbus or the Engine Manufacturer) under or cancellation, termination or rescission or purported cancellation, termination or rescission of any Airbus Purchase Agreement or any Engine Agreement specifying
in reasonable detail the nature of such default, cancellation, rescission or termination; 

  

	 	(ii)	 not, without the Security Trustee’s prior written consent, in any way modify, cancel, terminate or amend
or consent to the modification, cancellation, termination or amendment of any Airbus Purchase Agreement or any Engine Agreement except to the extent permitted by the Credit Agreement; 

 

	 	(iii)	 not accept, and shall procure that the Borrower or any other Person does not accept, delivery of any Aircraft
from Airbus before or concurrently with repaying to the Lenders all amounts owing in respect of the Loans relating to that Aircraft; 

  

	 	(iv)	 not enter into or consent to any change order or other amendment, modification or supplement to any Airbus
Purchase Agreement or any Engine Agreement, in relation to the Aircraft, without the prior written consent and countersignature of the Security Trustee (acting at the unanimous direction of the Lenders) if such change order, amendment, modification
or supplement would require the consent of the Security Trustee under the Step-In Agreement or under the Credit Agreement; 

 

	 	(v)	 provide to the Security Trustee promptly after the execution of the same copies, certified by the Guarantor, of
all material change orders (other than non charge change orders), amendments, modifications or supplements to the Assigned Purchase Agreements that would require the consent of the Security Trustee under the
Step-In Agreement or under the Credit Agreement; 

  
 - 10- 

	 	(vi)	 provide to the Security Trustee promptly upon request, such information regarding the package of product
support and training services as was agreed to be provided by Airbus to the Guarantor under the Assigned Purchase Agreements and agrees not to take any action or omit to take any action which would reduce the product support and training services
which would otherwise be available to Intrepid by Airbus with respect to the Aircraft under the Assigned Purchase Agreements; and 

  

	 	(vii)	 not agree to any financial indebtedness cross default (in respect of it or any of its Affiliates) with Airbus
that would give rise to a right for Airbus to terminate the Assigned Purchase Agreements. 

  

	(e)	 The Guarantor shall not accept any repayment of any part of the Subordinated Loan Agreement while the Secured
Obligations remain outstanding. 

  

	(f)	 Financial Covenants 

 

	 	The	 Guarantor shall: 

  

	 	(i)	 at all times ensure that it has: (A) liquidity in the form of Unrestricted Cash and Cash Equivalents in an
aggregate amount of not less than (i) so long as the Initial Lender’s aggregate outstanding principal amount of Loans and Line of Credit Borrowings together with its aggregate Commitment is an amount greater than [***], [***] or
(ii) if the Initial Lender’s aggregate outstanding principal amount of Loans and Line of Credit Borrowings together with its aggregate Commitment is an amount less than or equal to [***], [***] and (B) Shareholders’ Equity in an
aggregate amount of not less than [***]; and 

  

	 	(ii)	 not make nor declare any Distribution unless its Shareholders’ Equity is an aggregate amount of not less
than [***]. 

 The Guarantor shall, on each date on which its financial statements are required to be delivered by the
Borrower pursuant to Clause 10.15(a) and (b) of the Credit Agreement and on each date on which a Funding Notice is issued under the Credit Agreement, deliver to the Facility Agent a certificate in writing (which may be provided by e-mail) confirming compliance with this Clause 9(f), such certificate to be accompanied by supporting financial information for the Guarantor and the Group (which, in respect of the confirmation to be provided on
the date of a Funding Notice, shall be the group management accounts most recently prepared and the knowledge of any officer of the Guarantor) and shall otherwise promptly notify the Security Trustee of any breach by the Guarantor of any of its
obligations hereunder. For purposes of this Clause 9(f), the following definitions shall apply: 
 “Distribution”
means any dividend or other distribution to any class of its shareholders. 
 “Shareholders’ Equity” means the
Guarantor’s shareholders’ equity as stated in its financial statements calculated in accordance with GAAP. 

  
 - 11- 

 “Unrestricted Cash and Cash Equivalents” means at any date in respect of
the Guarantor, the sum of (a) the undrawn portion available under any revolving, delayed draw or similar credit facilities, in each case that have a maturity of one (1) year or more from such date, (b) available liquidity and
(c) the cash and cash equivalents (in each case, as such terms are defined by GAAP) of the Guarantor on a consolidated based, that may be in each case (i) classified as “unrestricted” in accordance with GAAP on the consolidated
balance sheets of the Guarantor or (ii) classified in accordance with GAAP as “restricted” on the consolidated balance sheets of the Guarantor solely in favor of the Security Trustee and the Lenders, provided that if the Guarantor
agrees to any more onerous definition pursuant to any financial covenant in any agreement to which it is a party, this definition shall be deemed to be deleted and replaced with such other definition. 

 

	10.	 SUCCESSORS AND ASSIGNS 

 

	(a)	 This Guarantee shall be binding upon the Guarantor and upon the Guarantor’s successors and assigns and all
references herein to the Guarantor or the Security Trustee shall be deemed to include any successor or successors whether immediate or remote, to such Person. The Guarantor shall not assign any of its rights or obligations hereunder without the
prior written consent of the Security Trustee, the Facility Agent and each Lender. 

  

	(b)	 This Guarantee shall inure to the benefit of the Security Trustee, the Facility Agent each Lender and their
respective successors and assigns, and all references herein to the Security Trustee, the Facility Agent or any Lender shall be deemed to include any successors and assigns of such Person (whether or not reference in a particular provision is made
to such successors and assigns). 

  

	11.	 NOTICES 

All notices, demands or requests given pursuant to this Guarantee shall be in writing personally delivered, or sent by facsimile (with
subsequent telephone confirmation of receipt thereof) or sent by internationally recognized overnight courier service, to the following addresses: 
  

	(a)	 if to the Guarantor: 

Frontier Airlines Holdings, Inc. 

7001 Tower Road 
 Denver, CO 80249

 Attention: SVP – General Counsel 

Phone: (###) ###-#### 
 Email: ###

  

	(b)	 if to the Security Trustee: 

Bank of Utah 
 50 South 200 East,
Suite 110 
 Salt Lake City, Utah 84111 

Telephone: ### ###-#### 

Facsimile: ### ###-#### 
 Email:
### 

  
 - 12- 

 Whenever any notice in writing is required to be given by the Guarantor or the Security
Trustee, such notice shall be deemed given and such requirement satisfied when such notice is received, with such notice received if such notice is mailed by certified mail, postage prepaid, or is sent by facsimile, addressed as provided above. 

Either party hereto may change the address to which notices to such party will be sent by giving notice of such change to the other party. 

 

	12.	 GOVERNING LAW; COUNTERPARTS 

THIS GUARANTEE SHALL IN ALL RESPECTS BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAW OF THE STATE OF NEW YORK, INCLUDING ALL MATTERS
OF CONSTRUCTION, VALIDITY AND PERFORMANCE. This Guarantee may be executed by the parties hereto in separate counterparts, each of which when so executed and delivered shall be an original, but all such counterparts shall together constitute but one
and the same instrument. 
  

	13.	 WAIVER OF JURY TRIAL 

EACH PARTY WAIVES, TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, ANY RIGHT IT MAY HAVE TO A TRIAL BY JURY IN ANY LEGAL PROCEEDING DIRECTLY
OR INDIRECTLY ARISING OUT OF OR RELATING TO THIS GUARANTEE OR THE TRANSACTIONS CONTEMPLATED HEREBY (WHETHER BASED ON CONTRACT, TORT OR ANY OTHER THEORY). EACH PARTY HERETO (A) CERTIFIES THAT NO REPRESENTATIVE, AGENT OR ATTORNEY OF ANY OTHER
PARTY HAS REPRESENTED, EXPRESSLY OR OTHERWISE, THAT SUCH OTHER PARTY WOULD NOT, IN THE EVENT OF LITIGATION, SEEK TO ENFORCE THE FOREGOING WAIVER AND (B) ACKNOWLEDGES THAT IT AND THE OTHER PARTIES HERETO HAVE BEEN INDUCED TO ENTER INTO THIS
GUARANTEE BY, AMONG OTHER THINGS, THE MUTUAL WAIVERS AND CERTIFICATIONS IN THIS CLAUSE. 
  

	14.	 JURISDICTION 

  

	(a)	 The Guarantor hereby irrevocably and unconditionally submits, for itself and its property, to the non-exclusive jurisdiction of the Supreme Court of the State of New York sitting in New York County and of the United States District Court of the Southern District of New York, and any appellate court from any
thereof, in any action or proceeding arising out of or relating to this Guarantee, or for recognition or enforcement of any judgment, and the Guarantor irrevocably and unconditionally agrees that all claims in respect of any such action or
proceeding may be heard and determined in such New York State or, to the extent permitted by law, in such Federal court. The Guarantor agrees that a final judgment in any such action or proceeding shall be conclusive and may be enforced in other
jurisdictions by suit on the judgment or in any other manner provided by law. Nothing in this Guarantee shall affect any right that the Security Trustee or any Lender may otherwise have to bring any action or proceeding relating to this Guarantee
against another party or its properties in the courts of any jurisdiction. 

  
 - 13- 

	(b)	 The Guarantor irrevocably and unconditionally waives, to the fullest extent it may legally and effectively do
so, any objection which it may now or hereafter have to the laying of venue of any suit, action or proceeding arising out of or relating to this Guarantee in any court referred to in paragraph (a) of this Clause. The Guarantor hereby
irrevocably waives, to the fullest extent permitted by law, the defense of an inconvenient forum to the maintenance of such action or proceeding in any such court. 

 

	15.	 SERVICE OF PROCESS 

Each party to this Guarantee irrevocably consents to service of process in the manner provided for the delivery of notices in Clause 11.
Nothing in this Guarantee will affect the right of any party to this Guarantee to serve process in any other manner permitted by law. The Guarantor hereby irrevocably appoints and designates Corporation Services Company (the “Agent for
Service of Process”), having an address at Corporation Service Company, 80 State Street, Albany, New York 12207-2543, as its true and lawful attorney-in-fact
and duly authorized agent for the limited purpose of accepting service of legal process and the Guarantor agrees that service of process upon such party shall constitute personal service of such process on such person. The Guarantor shall maintain
the designation and appointment of the Agent for Service of Process at such address until all amounts payable under this Guarantee shall have been paid in full. If the Agent for Service of Process shall cease to so act, the Guarantor shall
immediately designate and shall promptly deliver to the Security Trustee evidence in writing of acceptance by another agent for service of process of such appointment, which such other agent for service of process shall have an address for receipt
of service of process in the State of New York and the provisions above shall equally apply to such other agent for service of process. 

[Signature page follows] 

  
 - 14- 

 IN WITNESS WHEREOF, this Guarantee has been executed and delivered by the Guarantor’s duly
authorized officer as of the date first written above. 
  

			
	FRONTIER AIRLINES HOLDINGS, INC.
		
	By:	 	 /s/ Howard Diamond

		 	Name: Howard Diamond
		 	Title: Senior Vice President, General Counsel and Secretary

 ACCEPTED and AGREED: 
  

					
	 BANK OF UTAH
 not in its
individual capacity but solely
 as Security Trustee

		
	By:	 	 /s/ Joseph H. Pugsley

		 	Name: Joseph H. Pugsley
		 	Title: Vice President

  

					
	By:	 	 /s/ Michael Arsenault

		 	Name: Michael Arsenault
		 	Title: Vice President

  
 [Signature Page - Sixth
Amended and Restated Guarantee]

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