Document:

EX-10.17(c)

	*****	 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 10.17(c) 

LETTER AGREEMENT NO. 6A 
 As of
October 31, 2014 
 Frontier Airlines, Inc. 

7001 Tower Road 
 Denver, Colorado
80249-7312 
  

	Re:	 A321 AIRCRAFT PERFORMANCE GUARANTEE – CEO (CFM ENGINES) 

Dear Ladies and Gentlemen, 

FRONTIER AIRLINES (the “Buyer”) and AIRBUS S.A.S. (the “Seller”) have entered into an Airbus A321
Purchase Agreement of even date herewith (the “Agreement”) which covers, among other matters, the sale by the Seller and the purchase by the Buyer of certain Aircraft, under the terms and conditions set forth in said Agreement. The
Buyer and the Seller have agreed to set forth in this Letter Agreement No. 6A (the “Letter Agreement”) certain additional terms and conditions regarding the sale of the A321 Aircraft. Capitalized terms used herein and not otherwise
defined in this Letter Agreement have the meanings assigned thereto in the Agreement. The terms “herein,” “hereof” and “hereunder” and words of similar import refer to this Letter Agreement. 

Both parties agree that this Letter Agreement constitutes an integral, nonseverable part of said Agreement, that the provisions of said
Agreement are hereby incorporated herein by reference, and that this Letter Agreement is governed by the provisions of said Agreement, except that if the Agreement and this Letter Agreement have specific provisions which are inconsistent, the
specific provisions contained in this Letter Agreement will govern. 

	1.	 AIRCRAFT CONFIGURATION 

The guarantees defined in Paragraphs 2 and 3 below (the “Guarantees”) are applicable to the A321 Aircraft as
described in the A321 Standard Specification ***** as amended by the following SCNs: 
  

	 	ii)	 ***** 

  

	 	iii)	 ***** 

  

	 	iii)	 ***** 

hereinafter referred to as the “Specification” without taking into account any further changes thereto as
provided in the Agreement except as provided in paragraph 6 below (for purposes of this Letter Agreement the “A321 Aircraft”). 
  

	2.	 ***** GUARANTEES 

 

	2.1	 ***** 

  

	2.1.1	 ***** 

***** 
  

	a)	 ***** 

  

	b)	 ***** 

  

	c)	 ***** 

  

	d)	 ***** 

  

	e)	 ***** 

  

	f)	 ***** 

  

	g)	 ***** 

  

	h)	 ***** 

  

	 	1)	 ***** 

  

	 	2)	 ***** 

  

	 	3)	 ***** 

  

	 	4)	 ***** 

  

	 	5)	 ***** 

  

	2.1.2	 ***** 

***** 

  
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	2.2	 ***** 

  

	2.2.1	 ***** 

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	b)	 ***** 

  

	c)	 ***** 

  

	d)	 ***** 

  

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	f)	 ***** 

  

	g)	 ***** 

  

	h)	 ***** 

  

	 	1)	 ***** 

  

	 	2)	 ***** 

  

	 	3)	 ***** 

  

	 	4)	 ***** 

  

	 	5)	 ***** 

  

	2.2.2	 ***** 

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	2.3	 ***** 

  

	2.3.1	 ***** 

***** 
  

	a)	 ***** 

  

	b)	 ***** 

  

	c)	 ***** 

  

	d)	 ***** 

  

	e)	 ***** 

  

	f)	 ***** 

  
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	g)	 ***** 

  

	h)	 ***** 

  

	 	1)	 ***** 

  

	 	2)	 ***** 

  

	 	3)	 ***** 

  

	 	4)	 ***** 

  

	 	5)	 ***** 

  

	2.3.2	 ***** 

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	2.4	 ***** 

  

	2.4.1	 ***** 

***** 
  

	a)	 ***** 

  

	b)	 ***** 

  

	c)	 ***** 

  

	d)	 ***** 

  

	e)	 ***** 

  

	f)	 ***** 

  

	g)	 ***** 

  

	h)	 ***** 

  

	 	1)	 ***** 

  

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	2.5	 ***** 

  

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 Confidential 

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	g)	 ***** 

  

	h)	 ***** 

  

	 	1)	 ***** 

  

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	2.6	 ***** 

  

	3.	 ***** GUARANTEE 

***** 
  

	4.	 GUARANTEE CONDITIONS 

 

	4.1	 ***** 

  

	4.2	 ***** 

  

	4.3	 ***** 

  

	4.4	 ***** 

  

	4.5	 ***** 

  

	5.	 GUARANTEE COMPLIANCE 

 

	5.1	 ***** 

  
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	5.2	 ***** 

  

	5.3	 ***** 

  

	5.4	 ***** 

  

	5.5	 ***** 

  

	5.6	 ***** 

  

	5.7	 ***** 

  

	6.	 ADJUSTMENT OF GUARANTEES 

 

	6.1	 ***** 

  

	6.2	 ***** 

  

	7.	 EXCLUSIVE GUARANTEES 

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	8.	 ***** 

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	8.1	 ***** 

  

	8.1.1	 ***** 

  

	8.1.2	 ***** 

  

	8.2	 ***** 

  

	8.3	 ***** 

  
 Confidential 

 If the foregoing correctly sets forth your understanding, please execute the original and one
(1) copy hereof in the space provided below and return a copy to the Seller. 
  

			
	Very truly yours,
	
	AIRBUS S.A.S.
		
	By:	 	 /s/ Christophe Mourey

		
	Its:	 	 Senior Vice President Contracts

  

			
	Accepted and Agreed
	
	FRONTIER AIRLINES, INC.
		
	By:	 	 /s/ James G. Dempsey

		
	Its:	 	 Chief Financial Officer

  
 ConfidentialEX-10.17(d)

	*****	 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 10.17(d) 

LETTER AGREEMENT NO. 6B 
 As of
October 31, 2014 
 Frontier Airlines, Inc. 
 7001 Tower
Road 
 Denver, Colorado 80249-7312 
  

	Re:	 A321 AIRCRAFT PERFORMANCE GUARANTEE – CEO (IAE ENGINES) 

Dear Ladies and Gentlemen, 

FRONTIER AIRLINES (the “Buyer”) and AIRBUS S.A.S. (the “Seller”) have entered into an Airbus A321 Purchase
Agreement of even date herewith (the “Agreement”) which covers, among other matters, the sale by the Seller and the purchase by the Buyer of certain Aircraft, under the terms and conditions set forth in said Agreement. The Buyer and
the Seller have agreed to set forth in this Letter Agreement No. 6B (the “Letter Agreement”) certain additional terms and conditions regarding the sale of the A321 Aircraft. Capitalized terms used herein and not otherwise
defined in this Letter Agreement have the meanings assigned thereto in the Agreement. The terms “herein,” “hereof” and “hereunder” and words of similar import refer to this Letter Agreement. 

Both parties agree that this Letter Agreement constitutes an integral, nonseverable part of said Agreement, that the provisions of said
Agreement are hereby incorporated herein by reference, and that this Letter Agreement is governed by the provisions of said Agreement, except that if the Agreement and this Letter Agreement have specific provisions which are inconsistent, the
specific provisions contained in this Letter Agreement will govern. 

	1.	 AIRCRAFT CONFIGURATION 

The guarantees defined in Paragraphs 2 and 3 below (the “Guarantees”) are applicable to the A321 Aircraft as
described in the A321 Standard Specification ***** as amended by the following SCNs: 
  

	 	i)	 ***** 

  

	 	ii)	 ***** 

  

	 	iii)	 ***** 

hereinafter referred to as the “Specification” without taking into account any further changes thereto as
provided in the Agreement except as provided in paragraph 6 below (for purposes of this Letter Agreement the “A321 Aircraft”). 
  

	2.	 ***** GUARANTEES 

 

	2.1	 ***** 

  

	2.1.1	 ***** 

***** 
  

	a)	 ***** 

  

	b)	 ***** 

  

	c)	 ***** 

  

	d)	 ***** 

  

	e)	 ***** 

  

	f)	 ***** 

  

	g)	 ***** 

  

	h)	 ***** 

  

	2.1.2	 ***** 

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	2.2	 ***** 

  
 Confidential 

	2.2.1	 ***** 

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	a)	 ***** 

  

	b)	 ***** 

  

	c)	 ***** 

  

	d)	 ***** 

  

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	f)	 ***** 

  

	g)	 ***** 

  

	h)	 ***** 

  

	 	1)	 ***** 

  

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	 	5)	 ***** 

  

	2.2.2	 ***** 

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	2.3	 ***** 

  

	2.3.1	 ***** 

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	b)	 ***** 

  

	c)	 ***** 

  

	d)	 ***** 

  

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	f)	 ***** 

  

	g)	 ***** 

  
 Confidential 

	h)	 ***** 

  

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	 	3)	 ***** 

  

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	2.3.2	 ***** 

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	2.4	 ***** 

  

	2.4.1	 ***** 

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	2.4.2	 ***** 

  

	2.4.3	 ***** 

  

	2.4.4	 ***** 

  

	2.4.5	 ***** 

  

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	2.5	 ***** 

  

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 Confidential 

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	2.6	 ***** 

  

	3.	 ***** GUARANTEE 

***** 
  

	4.	 GUARANTEE CONDITIONS 

 

	4.1	 ***** 

  

	4.2	 ***** 

  

	4.3	 ***** 

  

	4.4	 ***** 

  

	4.5	 ***** 

  

	5.	 GUARANTEE COMPLIANCE 

 

	5.1	 ***** 

  

	5.2	 ***** 

  

	5.3	 ***** 

  
 Confidential 

	5.4	 ***** 

  

	5.5	 ***** 

  

	5.6	 ***** 

  

	5.7	 ***** 

  

	6.	 ADJUSTMENT OF GUARANTEES 

 

	6.1	 ***** 

  

	6.2	 ***** 

  

	7.	 EXCLUSIVE GUARANTEES 

 

	    	 ***** 

  

	8.	 ***** 

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	8.1	 ***** 

  

	8.1.1	 ***** 

  

	8.1.2	 ***** 

  

	8.2	 ***** 

  

	8.3	 ***** 

  
 Confidential 

 If the foregoing correctly sets forth your understanding, please execute the original and one
(1) copy hereof in the space provided below and return a copy to the Seller. 
  

			
	Very truly yours,
	
	AIRBUS S.A.S.
		
	By:	 	 /s/ Christophe Mourey

		
	Its:	 	 Senior Vice President Contracts

  

			
	Accepted and Agreed
	
	FRONTIER AIRLINES, INC.
		
	By:	 	 /s/ James G. Dempsey

		
	Its:	 	 Chief Financial Officer

  
 ConfidentialEX-10.17(e)

	 *****
	 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 10.17(e) 

LETTER AGREEMENT NO. 8 
 As of
October 31, 2014 
 Frontier Airlines Inc. 

7001 Tower Road, 
 Denver,
Colorado 80249-7312 
 REFERENCE: ***** 

FRONTIER AIRLINES Inc. (the “Buyer”) and AIRBUS (the “Seller”) have entered into an A321 Aircraft Purchase Agreement (the
“Agreement”), dated as of even date herewith that covers, among other things, the sale by the Seller and the purchase by the Buyer of certain Aircraft. 

The Buyer and the Seller have agreed to set forth in this Letter Agreement No. 8 (the “Letter Agreement”) certain additional
terms and conditions regarding the sale of the Aircraft. 
 Both parties agree that this Letter Agreement shall constitute an integral,
nonseverable part of said Agreement, that the provisions of said Agreement are hereby incorporated herein by reference, and that this Letter Agreement shall be governed by the provisions of said Agreement, except that if the Agreement and this
Letter Agreement have specific provisions that are inconsistent, the specific provisions contained in this Letter Agreement shall govern. 

  
 Confidential 

 If the foregoing correctly sets forth our understanding, please execute the original and one
(1) copy hereof in the space provided below and return a copy to the Seller. 
  

									
	 Agreed and Accepted
	 	       Agreed and Accepted
	 	
			
	 For and on behalf of
	 	       For and on behalf of
	 	
			
	 FRONTIER AIRLINES, INC.
	 	       AIRBUS S.A.S.
	 	
					
	 Name            :
	 	 /s/ James G. Dempsey
	 	       Name        :
	 	 /s/ Christophe Mourey
	 	
					
	 Title              :
	 	 Chief Financial Officer
	 	       Title          :
	 	 Senior Vice President Contracts
	 	
					
	 Date              :
	 	 [Undated]
	 		 		 	

  
 Confidential

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