Document:

EXHIBIT 10.5

 Exhibit 10.5 
  
 AMENDMENT NUMBER 1 TO LETTER AGREEMENT DCT-022/03 
  
 This Amendment Number 1 to the Letter Agreement DCT-022/03, dated as of December 22nd, 2003 (this “Amendment”) relates to the Letter Agreement Number DCT-022/03 between EMBRAER-Empresa Brasileira de Aeronáutica S.A.
(“Embraer”) and US Airways Group, Inc. (“Buyer”) dated May 9th, 2003 (as amended, the
“Letter Agreement”), Buyer and Embraer are collectively referred to herein as the “Parties”. Except as otherwise defined herein, all capitalized terms used herein shall have the meanings set forth or referred to in the Letter
Agreement or in the Purchase Agreement DCT-021/03 dated as of May 9th, 2003 (as amended, the “Purchase
Agreement”). 
  
 This Amendment sets forth the further
agreement between Embraer and Buyer relative to, among other things, ***. 
  
 NOW, THEREFORE, in consideration of the foregoing, Embraer and Buyer do hereby agree as follows: 
  

	1.	*** 

  
 ***. Therefore, Section 13.3 of the Letter Agreement is hereby deleted and replaced with the following: 
  
 “***” 
  

	2.	*** 

  
 ***. 
  
 ***. 
  

	3.	REFERENCES REVISION 

  
 3.1 ***. 
  
 3.2 ***. 
  
 3.3 ***. 
  
 3.4 ***. 
  

	4.	EFFECT UPON LETTER AGREEMENT 

  
 All terms and conditions of the Letter Agreement that have not been specifically and expressly altered or modified hereunder shall remain in full force
and effect. In the event any conflict exists between the terms of the 
  

	
	 Page 1 of 3
 Amendment No. 1 to Letter
 Agreement DCT-022/03

 Letter Agreement and the terms of this Amendment, the terms of this Amendment shall control. 

 

	5.	COUNTERPARTS 

  
 This Amendment may be executed by the Parties in any number of counterparts with the same effect as if the signatures thereto and hereto were upon the
same instrument and all of which when taken together shall constitute one and the same instrument. 
  

	
	 Page 2 of 3
 Amendment No. 1 to Letter
 Agreement DCT-022/03

 IN WITNESS WHEREOF, the Parties have caused this Amendment to be duly executed and delivered by their proper and duly
authorized officers and to be effective as of the day and year first above written. 
  

									
	 US AIRWAYS GROUP, INC.
  
	 	 	 	 EMBRAER – EMPRESA BRASILEIRA DE AERONÁUTICA S.A.
  

					
	By:	 	/s/    Eilif Serck-Hanssen        	 	 	 	 By:
	 	/s/    Carlos Rocha Villela        
	 	 	
	 	 	 	 	 	

	 Name:
	 	Eilif Serck-Hanssen	 	 	 	 Name:
	 	Carlos Rocha Villela
	 	 	
	 	 	 	 	 	

	 Title:
	 	VP – Finance & Treasurer	 	 	 	 Title:
	 	Vice-President and General Counsel
	 	 	
	 	 	 	 	 	

					
	 	 	 	 	 	 	 By:
	 	/s/    Flavio Rimoli        
	 	 	 	 	 	 	 	 	

	 	 	 	 	 	 	 Name:
	 	Flavio Rimoli
	 	 	 	 	 	 	 	 	

	 	 	 	 	 	 	 Title:
	 	Sr. Vice President—Airline Market
	 	 	 	 	 	 	 	 	

					
	Witness:	 	/s/    Ross L. Cotjanle        	 	 	 	 Witness:
	 	/s/    Hilario M. Oliveira      
	 	 	
	 	 	 	 	 	

	 Name:
	 	Ross L. Cotjanle	 	 	 	 Name:
	 	Hilario M. Oliveira
	 	 	
	 	 	 	 	 	

					
	 Date:
	 	 December 22, 2003
	 	 	 	 Date:
	 	 January 6, 2004

	 Place:
	 	 Arlington, VA
	 	 	 	 Place:
	 	 Sao Jose Dos Campos, SP Brazil

  

	
	 Page 3 of 3
 Amendment No. 1 to Letter
 Agreement DCT-022/03<PAGE>

                                                                    Exhibit 10.6

                              CONTRACT CHANGE ORDER

PURCHASER:                         US Airways Group, Inc.

AGREEMENT:                         Master Purchase Agreement number MPA-515
                                   dated May 9, 2003 between US Airways Group,
                                   Inc. and Bombardier Inc., represented by
                                   Bombardier Aerospace - Regional Aircraft (the
                                   "Purchase Agreement").

C.C.O. NO.:                        001

DATE OF ISSUE:                     January 26, 2004

NO. OF PAGES:                      5

REASONS FOR CHANGE:                Addition of Letter Agreement No. 21 to the
                                   Purchase Agreement.

DESCRIPTION OF AGREED CHANGES

1.0  Letter Agreement No. 21 is hereby added to the Purchase Agreement and is
     attached hereto as Attachment 1.

        ALL OTHER TERMS AND CONDITIONS OF THE AGREEMENT REMAIN UNCHANGED

FOR AND ON BEHALF OF                           FOR AND ON BEHALF OF

BOMBARDIER INC.                                US AIRWAYS GROUP, INC.
Bombardier Aerospace - Regional Aircraft

Signed: /s/ Nicolas Mastroianni                Signed: /s/ Eilif Serck-Hanssen
        --------------------------------               -------------------------

Name:   Nicolas Mastroianni                    Name:   Eilif Serck-Hanssen
        --------------------------------               -------------------------

Title:  Account Executive, Contracts           Title:  VP-Finance and Treasurer
        --------------------------------               -------------------------

Date:   January 27, 2004                       Date:   January 27, 2004
        --------------------------------               -------------------------

<PAGE>

January 26, 2004

US Airways Group, Inc.
2345 Crystal Drive
Arlington, Virginia
22227  USA

Ladies and Gentlemen,

Letter Agreement No. 21 (the "Letter Agreement") to Purchase Agreement No.
MPA-515 dated May 9, 2003 (the "Agreement") between Bombardier Inc. represented
by Bombardier Aerospace, Regional Aircraft ("Bombardier") and US Airways Group,
Inc. ("Buyer") relating to the purchase of eighty-five (85) Bombardier CRJ
Aircraft.

Subject:

This Letter Agreement, when accepted by and agreed to by Buyer contemporaneously
with the execution of the Agreement, will evidence our further agreement with
respect to the matters set forth below.

All terms used herein and in the Agreement and not defined herein shall have the
same meaning as in the Agreement.

1.0  ***:

     (i)   ***

           ***

           ***

           ***

                                            ------------------------------------
                                            Initials

                                            US Airways_______ Bombardier________
                                            ------------------------------------

                                      -1-

<PAGE>

     (ii)  ***

2.0  ***

3.0  The provisions of this Letter Agreement are personal to Buyer and, except
     as otherwise provided in the Agreement, shall not be assigned or otherwise
     disposed of by Buyer without the prior written consent of Bombardier.

4.0  In the event of the termination of the Agreement, this Letter Agreement
     shall automatically become null and void.

5.0  This Letter Agreement constitutes an integral part of the Agreement and is
     subject to the terms and conditions contained therein.

Should there be any inconsistency between this Letter Agreement and the
Agreement and/or the applicable Supplement with respect to the subject matter
covered by the terms hereof, then this Letter Agreement shall prevail.

Yours very truly,
Bombardier Aerospace

/s/ Nicolas Mastroianni
-------------------------------
Name:  Nicolas Mastroianni
Title: Account Executive, Contracts
       Regional Aircraft

Agreed and accepted this 27th day of January, 2004

US Airways Group, Inc.

/s/ Eilif Serck-Hanssen
-------------------------------
Name:  Eilif Serck-Hanssen
Title: Vice President - Finance & Treasurer

                                            ------------------------------------
                                            Initials

                                            US Airways_______ Bombardier________
                                            ------------------------------------

                                      -2-<PAGE>

                                                                    Exhibit 10.7

                              CONTRACT CHANGE ORDER

PURCHASER:                     US Airways Group, Inc.

AGREEMENT:                     Master Purchase Agreement number MPA-515 dated
                               May 9, 2003 between US Airways Group, Inc. and
                               Bombardier Inc., represented by Bombardier
                               Aerospace - Regional Aircraft (the "Agreement").

C.C.O. NO.:                    002

DATE OF ISSUE:                 January 30, 2004

NO. OF PAGES:                  3

REASON FOR CHANGE:             ***.

DESCRIPTION OF AGREED CHANGE(S)

For the purposes of this Contract Change Order No. 002 ("CCO No. 2"), "US
Airways" means US Airways Group, Inc. and "Bombardier" means Bombardier Inc.,
represented by Bombardier Aerospace - Regional Aircraft.

1.0  Letter Agreement Number 11 to the Agreement is hereby amended to
     incorporate Schedule C attached hereto as Attachment 1 to this CCO No. 2
     relating to: ***.

2.0  ***.

             The remainder of this page is intentionally left blank.

                                      -1-

<PAGE>

3.0  Unless specified otherwise, Bombardier shall make:

          Bank Name:    ***
          Address:      ***

          ABA #:        ***
          Account #:    ***
          Account Name: ***

4.0  US Airways shall make:

          Bank Name:    ***
          Bank Address: ***

          ABA #:        ***
          Account #:    ***
          Account Name: ***

        ALL OTHER TERMS AND CONDITIONS OF THE AGREEMENT REMAIN UNCHANGED

FOR AND ON BEHALF OF                          FOR AND ON BEHALF OF

BOMBARDIER INC.                               US AIRWAYS GROUP, INC.
Bombardier Aerospace - Regional Aircraft

Signed: /s/ Nicolas Mastroianni               Signed:   /s/ Eilif Serck-Hanssen
        -----------------------------                ---------------------------

Name:   Nicolas Mastroianni                   Name:  Eilif Serck-Hanssen
        ------------------------------               ---------------------------

Title:  Account Executive, Contracts          Title: VP - Finance and Treasurer
        ------------------------------               ---------------------------

Date:   February 9, 2004                      Date:  February 5, 2004
        ------------------------------               ---------------------------

                                       -2-

<PAGE>

                                   Schedule C

                MSN            ***
                FAA            ***

-----------------------------------------------------------------------------
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                                      -3-

<PAGE>

                              CONTRACT CHANGE ORDER

PURCHASER:                         US Airways Group, Inc.

AGREEMENT:                         Master Purchase Agreement number MPA-515
                                   dated May 9, 2003 between US Airways Group,
                                   Inc. and Bombardier Inc., represented by
                                   Bombardier Aerospace - Regional Aircraft (the
                                   "Agreement").

C.C.O. NO.:                        002 - Supplement 1

DATE OF ISSUE:                     January 30, 2004

NO. OF PAGES:                      3

REASON FOR CHANGE:                 ***

DESCRIPTION OF AGREED CHANGE(S)

For the purposes of this Contract Change Order No. 002 - Supplement 1 ("CCO No.
2S1"), "US Airways" means US Airways Group, Inc. and "Bombardier" means
Bombardier Inc., represented by Bombardier Aerospace - Regional Aircraft. This
CCO No. 2S1 supplements CCO No. 2 previously entered into between US Airways and
Bombardier. For the avoidance of doubt, CCO No. 2 remains in full force and
effect and is not cancelled or superseded by this CCO No. 2S1.

1.0  Letter Agreement Number 11 to the Agreement is hereby amended to
     incorporate Schedule C-1 attached hereto as Attachment 1 to this CCO No.
     2S1 relating to: ***.

2.0  ***.

             The remainder of this page is intentionally left blank.

                                      -1-

<PAGE>

3.0  Unless specified otherwise, Bombardier shall make ***:

          Bank Name:       ***
          Address:         ***
          ABA #:           ***                       Account #:  ***
          Account Name:    ***

4.0  US Airways shall make ***:

          Bank Name:       ***
          Bank Address:    ***

          ABA #:           ***
          Account #:       ***
          Account Name:    ***.

        ALL OTHER TERMS AND CONDITIONS OF THE AGREEMENT REMAIN UNCHANGED

FOR AND ON BEHALF OF                          FOR AND ON BEHALF OF

BOMBARDIER INC.                               US AIRWAYS GROUP, INC.
Bombardier Aerospace - Regional Aircraft

Signed: /s/ Nicolas Mastroianni               Signed: /s/ Eilif Serck-Hanssen
        --------------------------------              --------------------------

Name:    Nicolas Mastroianni                  Name:   Eilif Serck-Hanssen
        --------------------------------              --------------------------

Title:   Account Executive, Contracts         Title:  VP- Finance and Treasurer
        --------------------------------              --------------------------

Date:    February 9, 2004                     Date:   February 5, 2004
        --------------------------------              --------------------------

                                       -2-

<PAGE>

                                  Schedule C-1

                MSN            ***
                FAA            ***
------------------------------------------------------------------------------
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                                       -3-

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