Document:

<PAGE>

                                                                    Exhibit 10.1

                                                                    CONFIDENTIAL

                        AMENDMENT NO. 1 TO LOAN AGREEMENT

     AMENDMENT NO. 1 (THIS "AMENDMENT"), DATED AS OF DECEMBER 18, 2003, TO LOAN
AGREEMENT, dated as of March 31, 2003, among US Airways, Inc. (the "Borrower"),
US Airways Group, Inc. ("Group"), the Subsidiary Guarantors party thereto (the
"Subsidiary Guarantors"), the several lenders from time to time party thereto
(the "Lenders"), Bank of America, N.A., as Agent (the "Agent"), Bank of America,
N.A., as KHFC Administrative Agent (the "KHFC Administrative Agent"), Bank of
America, N.A., as Collateral Agent (the "Collateral Agent," and collectively
with the Agent and the KHFC Administrative Agent, the "Agents") and Air
Transportation Stabilization Board (the "ATSB") created pursuant to the Air
Transportation Safety and System Stabilization Act (the "Act"), P.L. 107-42
(2001), as the same may be amended from time to time.

                             PRELIMINARY STATEMENTS:

          (1) The Borrower, Group, the Subsidiary Guarantors, the Lenders,
Phoenix American Financial Services, Inc., as Loan Administrator, the Agents and
the ATSB have entered into a Loan Agreement, dated as of March 31, 2003 (as
amended, supplemented or otherwise modified through the date hereof, the "Loan
Agreement"). Capitalized terms not otherwise defined in this Amendment have the
same meanings as specified therefor in the Loan Agreement.

          (2) The Borrower, Group and the Subsidiary Guarantors have requested
that the Board, the Agents, and the Lenders agree to amend the Loan Agreement as
hereinafter provided.

          (3) The Board, the Agents, and the Lenders are willing to amend the
Loan Agreement on the terms and conditions set forth herein.

          SECTION 1. Amendment to Loan Agreement. Subject to the terms and
conditions set forth below, the definition of "Investment" contained in Section
1.1 of the Loan Agreement is hereby amended by inserting the following text
immediately after the word "Obligor" the second time it appears in the proviso
contained in such definition: ", Guarantees (including any support for a letter
of credit issued on behalf of another Obligor) incurred by one Obligor for the
benefit any other Obligor,".

          SECTION 2. Conditions of Effectiveness. This Amendment shall become
effective as of the date hereof, upon the satisfaction of the condition
precedent that the Board, the Agents, and the Lenders shall have received
executed counterparts of this Amendment duly delivered by the parties hereto.

<PAGE>

          SECTION 3. Reference to and Effect on the Loan Documents.

          (a) On and after the effectiveness of this Amendment, each reference
in the Loan Agreement to "this Agreement", "hereunder", "hereof" or words of
like import referring to the Loan Agreement, and each reference in the other
Loan Documents to "the Loan Agreement", "thereunder", "thereof" or words of like
import referring to the Loan Agreement, shall mean and be a reference to the
Loan Agreement as amended by this Amendment.

          (b) The Loan Agreement, as specifically amended by this Amendment, is
and shall continue to be in full force and effect and is hereby in all respects
ratified and confirmed.

          SECTION 4. Costs; Expenses. The Borrower agrees to pay on demand all
reasonable costs and expenses of the Board, the Agents, and the Lenders in
connection with the preparation, execution, delivery and administration,
modification and amendment of this Amendment and the other instruments and
documents to be delivered hereunder (including, without limitation, the
reasonable fees and expenses of counsel for the Board, the Agents, and the
Lenders) in accordance with the terms of Section 11.3 of the Loan Agreement.

          SECTION 5. Execution in Counterparts. This Amendment may be executed
in any number of counterparts and by different parties hereto in separate
counterparts, each of which when so executed shall be deemed to be an original
and all of which taken together shall constitute one and the same agreement.
Delivery of an executed counterpart of a signature page to this Amendment by
telecopier shall be effective as delivery of a manually executed counterpart of
this Amendment.

          SECTION 6. Governing Law. This Amendment shall be governed by, and
construed in accordance with, the laws of the State of New York.

                            [Signature Page Follows]

                                        2

<PAGE>

          IN WITNESS WHEREOF, the parties hereto have caused this Amendment to
be executed by their respective officers thereunto duly authorized, as of the
date first above written.

                                     US AIRWAYS, INC.

                                     By: /s/  Elizabeth K. Lanier
                                         ---------------------------------------
                                     Name:    Elizabeth K. Lanier
                                     Title:   Executive Vice President-Corporate
                                     Affairs and General Counsel

                                     US AIRWAYS GROUP, INC.

                                     By: /s/  Elizabeth K. Lanier
                                         ---------------------------------------
                                     Name:    Elizabeth K. Lanier
                                     Title:   Executive Vice President-Corporate
                                     Affairs and General Counsel

<PAGE>

MIDATLANTIC AIRWAYS, INC.

By: /s/  Jennifer C. McGarey
    --------------------------
Name:    Jennifer C. McGarey
Title:   Secretary

ALLEGHENY AIRLINES, INC.

By: /s/  Keith D. Houk
    --------------------------
Name:    Keith D. Houk
Title:   President and Chief Executive Officer

US AIRWAYS LEASING AND SALES, INC.

By: /s/  Daniel M. McDonald
    --------------------------
Name:    Daniel M. McDonald
Title:   President

MATERIAL SERVICES COMPANY, INC.

By: /s/  Jeffery A. McDougle
    --------------------------
Name:    Jeffery A. McDougle
Title:   President and Chief Executive Officer

PSA AIRLINES, INC.

By: /s/  Richard E. Pfennig
    --------------------------
Name:    Richard E. Pfennig
Title:   President and Chief Executive Officer

PIEDMONT AIRLINES, INC.

By: /s/  John F. Leonard
    --------------------------
Name:    John F. Leonard
Title:   President and Chief Executive Officer

<PAGE>

KITTY HAWK FUNDING
CORPORATION,
as Primary Tranche A Lender

By:_________________________
Name:
Title:

BANK OF AMERICA, N.A.,
as Alternate Tranche A Lender

By:_________________________
Name:
Title:

BANK OF AMERICA, N.A.,
as a Tranche B Lender

By:_________________________
Name:
Title:

BANK OF AMERICA, N.A.,
as Agent and Collateral Agent

By:____________________________
Name:
Title:

BANK OF AMERICA, N.A.,
as KHFC Administrative Agent

By:____________________________
Name:
Title:

RETIREMENT SYSTEMS OF
ALABAMA HOLDINGS LLC,
as a Tranche B Lender

By:_________________________
Name:
Title:

<PAGE>

PHOENIX AMERICAN FINANCIAL SERVICES, INC.,
as Loan Administrator

By:____________________________
Name:
Title:

AIR TRANSPORTATION
STABILIZATION BOARD

By: /s/  Michael Kestenbaum
    --------------------------
Name:    Michael Kestenbaum
Title:   Executive Director<PAGE>

                                                                    Exhibit 10.2

                                                                  EXECUTION COPY

                        AMENDMENT NO. 2 TO LOAN AGREEMENT

     AMENDMENT NO. 2 TO LOAN AGREEMENT (THIS "AMENDMENT"), dated as of March 12,
2004, among US Airways, Inc., a Delaware corporation (the "Borrower"), US
Airways Group, Inc., a Delaware corporation ("Group"), the Subsidiary Guarantors
party hereto (the "Subsidiary Guarantors"), the several lenders party hereto
(the "Lenders"), Bank of America, N.A., as Agent for the Lenders (in such
capacity, together with its successors and permitted assigns, the "Agent"), Bank
of America, N.A., as KHFC Administrative Agent (in such capacity, together with
its successors and permitted assigns, the "KHFC Administrative Agent"), Bank of
America, N.A., as Collateral Agent (in such capacity, together with its
successors and permitted assigns, the "Collateral Agent," and collectively with
the Agent and the KHFC Administrative Agent, the "Agents") and Air
Transportation Stabilization Board (the "Board") created pursuant to the Air
Transportation Safety and System Stabilization Act, P.L. 107-42 (2001), as the
same may be amended from time to time.

                              W I T N E S S E T H:

          WHEREAS, the parties hereto, together with Phoenix American Financial
Services, Inc., as Loan Administrator, have entered into a Loan Agreement dated
as of March 31, 2003 (as amended, restated, supplemented, or otherwise modified
from time to time prior to the date hereof, the "Loan Agreement"). Capitalized
terms not otherwise defined in this Amendment have the same meanings as
specified therefor in the Loan Agreement;

          WHEREAS, the Borrower and Group have requested that the Board, the
Agents, and the Lenders agree to amend the Loan Agreement as hereinafter
provided; and

          WHEREAS, the Board, the Agents, and the Lenders are willing to amend
the Loan Agreement on the terms and conditions set forth herein.

          NOW, THEREFORE, in consideration of the premises and the covenants and
agreements contained herein, the parties hereto hereby agree as follows:

          Section 1. Initial Optional Prepayment. On the Second Amendment
Effective Date (as defined below), the Borrower shall make an optional
prepayment of the Loan in an amount equal to $250,000,000.00 (the "Initial
Optional Prepayment"), together with accrued and unpaid interest to the Second
Amendment Effective Date on the amount so repaid. Each of the Agents, the Board
and the Lenders (a) hereby waives the fifteen (15) days' prior revocable notice
requirement for optional prepayments set forth in Section 2.5(a) of the Loan
Agreement and agrees that such prepayment may be made on the Second Amendment
Effective Date regardless of whether such notice has been given, and (b) hereby
waives any requirement pursuant to Section 2.9 of the Loan Agreement that the
Borrower make the Initial Optional Prepayment not later than 12:00 noon (New
York City time) on the Second Amendment Effective Date and agrees that,
notwithstanding the provisions of such Section 2.9, the Initial Optional
Prepayment shall

<PAGE>

be deemed to be received on the Second Amendment Effective Date regardless of
what time such payment is received on such date. Notwithstanding the provisions
of Section 2.5(c) of the Loan Agreement, the Initial Optional Prepayment shall
be applied to the then remaining installments of the outstanding principal
amount of the Loan ratably as to Tranche A and Tranche B and pro rata against
the originally scheduled principal payments on the Loan (and not in the inverse
order of maturity as otherwise provided in Section 2.5(c) of the Loan
Agreement).

          Section 2. Amendments to Loan Agreement. As of the Second Amendment
Effective Date (as defined below), the Loan Agreement is hereby amended as
follows:

                (a)  Amended Definitions.

                         (i)    The definition of "Cash Equivalents" contained
     in Section 1.1 of the Loan Agreement is hereby amended by deleting the
     words ", to the extent owned by any Obligor free and clear of all Liens
     (other than Liens created under the Collateral Documents)" therefrom.

                         (ii)   The definition of "Excluded Property" contained
     in Section 1.1 of the Loan Agreement is hereby amended by deleting the
     words ", but which consent the Obligors are unable to obtain after
     compliance with the first sentence of Section 5.8(g) hereof" from clause
     (i)(B) thereof.

                (b)  New Definitions. Section 1.1 of the Loan Agreement is
hereby amended by adding the following new definitions in proper alphabetical
order:

                         (i)    "85% Test" has the meaning specified in Section
     6.13.

                         (ii)   "Adjusted Applicable Loan Rating" has the
     meaning specified in clause (I) of Section 6.13(ii).

                         (iii)  "Applicable Loan Rating" has the meaning
     specified in clause (I) of Section 6.13(ii).

                         (iv)   "Covenant Relief Period" means each of the
     fiscal quarters of Group ending on or before December 31, 2005.

                         (v)    "Determination Date" has the meaning specified
     in clause (I) of Section 6.13(ii).

                         (vi)   "Eligible Assets" means those assets of Group
     and its Subsidiaries other than the Mainline Assets. Eligible Assets shall
     include, without limitation, the following assets: (i) all regional jets
     (the "Eligible Regional Jets") owned or operated by or for the benefit of
     the Borrower or by or for the benefit of, Piedmont Airlines, Inc., PSA
     Airlines, Inc., Allegheny Airlines, Inc., or the MidAtlantic Airways
     division of the Borrower (collectively, the "Express Carriers"),

                                        2

<PAGE>

     together with all purchase and financing agreements relating to Eligible
     Regional Jets or aircraft to become Eligible Regional Jets upon purchase;
     (ii) the Capital Stock of the Express Carriers (including the MidAtlantic
     Airways division of the Borrower if spun off into a wholly-owned
     Subsidiary); (iii) any and all assets of the Express Carriers; (iv) any and
     all transferable Slots and Gate Leases at New York's LaGuardia Airport,
     Boston's Logan Airport and Washington D.C.'s Reagan National Airport
     (collectively, the "Point-to-Point Focus Airports"); (v) all Gate Leases
     and Aircraft Related Facilities owned or used by any Obligor that are
     designed for or typically used for regional jet operations at airports
     other than Point-to-Point Focus Airports (collectively, the "Hub-and-Spoke
     Airports"); and (vi) all other Aircraft Related Equipment, regardless of
     whether such equipment is located at Point-to-Point Focus Airports or
     Hub-and-Spoke Airports, except to the extent that, as of the relevant
     Determination Date, the retention thereof is necessary for the Borrower to
     continue to operate its Mainline Jet Aircraft in its Mainline Business.

                         (vii)  "Initial Loan Rating" has the meaning specified
     in clause (I) of Section 6.13(ii).

                         (viii) "Initial Optional Prepayment" has the meaning
     specified in Section 1 of the Second Amendment.

                         (ix)   "Instrument Documentation" has the meaning
     specified in clause (J) of Section 6.13(ii).

                         (x)    "Mainline Assets" means those assets of the
     Borrower that, as of the relevant Determination Date, are necessary for the
     Borrower to continue to operate its core business as a hub-and-spoke
     network carrier operating Airbus and Boeing jet aircraft (the "Mainline
     Business") and shall be limited to (i) a minimum of 279 such jet aircraft
     owned or operated by the Borrower (the "Mainline Jet Aircraft"); and (ii)
     all airport facilities, ground equipment, maintenance equipment, aircraft
     parts and engines (including spare engines) and other Aircraft Related
     Facilities and other Aircraft Related Equipment, in each case to the extent
     necessary as of the relevant Determination Date to support the continued
     operation of the Mainline Jet Aircraft in the Mainline Business.

                         (xi)   "Mainline Jet Aircraft" has the meaning
     specified in the definition of "Mainline Assets."

                         (xii)  "Non-Cash Instrument" means any senior secured
     note or the equivalent in the form of a conditional or installment sales
     agreement, title retention agreement or lease which meets each of the
     applicable requirements of Section 6.13.

                         (xiii) "Related Transactions" has the meaning specified
     in clause (I) of Section 6.13(ii).

                                        3

<PAGE>

                         (xiv)  "Second Amendment" means that certain Amendment
     No. 2 to Loan Agreement, dated as of March 12, 2004, among the Borrower,
     Group, the Subsidiary Guarantors party thereto, the Lenders, the Agent, the
     KHFC Agent, the Collateral Agent, and the Board.

                         (xv)   "Second Amendment Effective Date" has the
     meaning specified in Section 4 of the Second Amendment.

                         (xvi)  "Specified Asset Sale" has the meaning specified
     in Section 6.13.

                         (xvii) "Unrestricted Cash" means, as of any time of
     determination, the reserve of unrestricted cash and Cash Equivalents of the
     Obligors taken as a whole which is free from all Liens other than the Liens
     created under the Collateral Documents and Permitted Encumbrances of the
     type described in clause (vii) of the definition of Permitted Encumbrances.

                (c)  Amendment to Section 2.6 of the Loan Agreement. Section
2.6(b) of the Loan Agreement is hereby amended by adding the following sentence
after the first sentence of such section:

     "Notwithstanding the foregoing provisions of this Section 2.6(b), the
     Borrower shall only be required to prepay the Loan in an aggregate amount
     equal to seventy-five percent (75%) of Net Cash Proceeds from any Asset
     Sale the definitive documentation setting forth the terms of which is
     executed and delivered during the period commencing on the Second Amendment
     Effective Date and ending on February 28, 2005, provided, however, that:
     (X) the aggregate amount of Net Cash Proceeds retained by the Borrower
     pursuant to the application of this sentence shall not exceed $125,000,000;
     and (Y) to the extent, if any, that as of the end of any month in which the
     Obligors receive any such Net Cash Proceeds in respect of Asset Sales,
     Unrestricted Cash exceeds $1,350,000,000, then (1) the Borrower shall
     prepay the Loan on the third Business Day of the following month in an
     aggregate amount equal to the lesser of (A) the remaining twenty-five
     percent (25%) of Net Cash Proceeds received during such month in respect of
     such Asset Sales and not otherwise used to prepay the Loan and (B) the
     amount of Unrestricted Cash in excess of $1,350,000,000 as of the end of
     such month, and (2) the amount of Net Cash Proceeds paid pursuant to this
     subclause (Y) shall not count toward the $125,000,000 limit on the
     retention of Net Cash Proceeds by the Borrower pursuant to subclause (X) of
     this proviso."

                (d)  Amendment to Section 5.1 of the Loan Agreement. Clause
(C)(2) of Section 5.1(b)(iii) of the Loan Agreement is hereby amended and
restated in its entirety as follows:

     "(2) (x) for each Fiscal Year commencing with the Fiscal Year ending
     December 31, 2004, shall not contain a going concern qualification, and

                                        4

<PAGE>

     (y) for each Fiscal Year commencing with the Fiscal Year ending December
     31, 2003, shall state (or shall be accompanied by a separate letter
     stating) that in making its examination no knowledge of any Default or
     Event of Default was obtained (to the extent such statement is not
     prohibited by, or inconsistent with, applicable accounting literature),
     and"

                (e)  Amendment to Section 5.8 of the Loan Agreement. Section
5.8(g) of the Loan Agreement is hereby amended and restated in its entirety as
follows: "intentionally omitted."

                (f)  Amendment to Section 6.1 of the Loan Agreement. Section
6.1(a)(iv) of the Loan Agreement is hereby amended and restated in its entirety
as follows:

     "(iv) Liens on assets in favor of the purchasers of such assets pursuant to
     installment or conditional sale agreements entered into in accordance with
     Section 6.13 and, to the extent, if any, that any of the following
     constitutes a Lien, the interest of any purchaser or its assignees in any
     purchase agreement, escrowed funds, hold-backs or similar arrangements in
     connection with any Asset Sale permitted by Section 6.13;".

                (g)  Amendments to Section 6.2 of the Loan Agreement. Section
6.2 of the Loan Agreement is hereby amended by deleting the word "and"
immediately before clause (x) thereof and adding the following text immediately
following such clause (x):

     "; (xi) Investments by the Borrower consisting of US Airways Pass Through
     Trust, Series 2000-1C, Trust Certificates in an aggregate outstanding
     amount not exceeding $34,500,000 at any time, provided that such
     certificates are pledged to the Collateral Agent in accordance with the
     Collateral Documents; (xii) Investments by any Obligor consisting of
     Non-Cash Instruments or other consideration received in connection with
     Asset Sales permitted by Section 6.13; and (xiii) to the extent
     constituting Investments, interests in escrow and hold-back arrangements
     entered into in connection with Asset Sales permitted by Section 6.13."

                (h)  Amendments to Section 6.4 of the Loan Agreement.

                         (i)    Section 6.4(a) of the Loan Agreement is hereby
     amended and restated in its entirety as follows:

     "(a) (i) subject to clause (iii) of this Section 6.4(a) to the extent its
     application would require a greater amount of Unrestricted Cash, at no time
     during the Covenant Relief Period shall Group permit Unrestricted Cash to
     be less than the lesser of (x) $500,000,000 plus the outstanding pool
     balance of US Airways Pass Through Trust, Series 2000-1C, Trust
     Certificates held by the Borrower from time to time pursuant to Section
     6.2(xi) and (y) the outstanding balance of the Loan (excluding accrued and
     unpaid interest thereon); (ii) subject to clause (iii) of this Section

                                       5

<PAGE>

     6.4(a) to the extent its application would require a greater amount of
     Unrestricted Cash, at no time after the Covenant Relief Period shall Group
     permit Unrestricted Cash to be less than $375,787,687; and (iii) until such
     time as the Borrower delivers to the Agent, the Lenders, the Loan
     Administrator and the Board an accountant's report accompanying annual
     financial statements of Group and the Borrower for the Fiscal Year ended
     December 31, 2003 or any subsequent fiscal year that does not contain a
     going concern qualification, Group shall not permit Unrestricted Cash to be
     less than (x) on the last day of each calendar month, the lesser of (A) the
     aggregate principal amount of the Loan outstanding on such day and (B)
     $700,000,000, and (y) as of the end of each day, the lesser of (A) the
     aggregate principal amount of the Loan outstanding on such day and (B)
     $575,000,000. Group and the Borrower may at any time request relief from
     the requirements of the foregoing clause (iii) on grounds that the facts
     and circumstances on which the qualification was based are no longer
     applicable, and the Board may consider granting such relief in its sole
     discretion."

          (ii) Section 6.4(b) of the Loan Agreement is hereby amended by
     amending and restating the table contained in such section as follows:

     ---------------------------------------------------------------------------
                                                         Applicable Consolidated
     Consolidated EBITDAR Period:                           Indebtedness Ratio
     ---------------------------------------------------------------------------
     Two consecutive fiscal quarters ending
     June 30, 2004                                             10.90:1.00
     ---------------------------------------------------------------------------
     Three consecutive fiscal quarters ending
     September 30, 2004                                         9.19:1.00
     ---------------------------------------------------------------------------
     Four consecutive fiscal quarters ending
     December 31, 2004                                          8.76:1.00
     ---------------------------------------------------------------------------
     Four consecutive fiscal quarters ending
     March 31, 2005                                             7.50:1.00
     ---------------------------------------------------------------------------
     Four consecutive fiscal quarters ending
     June 30, 2005                                              6.50:1.00
     ---------------------------------------------------------------------------
     Four consecutive fiscal quarters ending
     September 30, 2005                                         6.25:1.00
     ---------------------------------------------------------------------------
     Four consecutive fiscal quarters ending
     December 31, 2005                                          6.10:1.00
     ---------------------------------------------------------------------------
     Each period of four consecutive fiscal
     quarters ending on or after March 31, 2006                 5.50:1.00
     ---------------------------------------------------------------------------

          (iii) Section 6.4(c) of the Loan Agreement is hereby amended by
     amending and restating the table contained in such section as follows:

                                       6

<PAGE>

     ---------------------------------------------------------------------------
                                                                  Applicable
                                                            Consolidated EBITDAR
      Consolidated EBITDAR and                             to Consolidated Fixed
      Consolidated Fixed Charges Period:                       Charges Ratio
     ---------------------------------------------------------------------------
     Two consecutive fiscal quarters ending
     June 30, 2004                                               0.75:1.00
     ---------------------------------------------------------------------------
     Three consecutive fiscal quarters ending
     September 30, 2004                                          0.92:1.00
     ---------------------------------------------------------------------------
     Four consecutive fiscal quarters ending
     December 31, 2004                                           0.99:1.00
     ---------------------------------------------------------------------------
     Four consecutive fiscal quarters ending
     March 31, 2005                                              1.10:1.00
     ---------------------------------------------------------------------------
     Each period of four consecutive fiscal
     quarters ending on or after June 30, 2005                   1.20:1.00
     ---------------------------------------------------------------------------

          (iv) Section 6.4 of the Loan Agreement is hereby further amended by
     inserting the following new subsection immediately following Section
     6.4(c):

     "(d) Group shall not permit its ratio of consolidated Indebtedness as of
     the last day of the periods specified below to Consolidated EBITDAR for the
     periods consisting of the applicable number of consecutive fiscal
     quarter(s) specified below that end on such day, to be greater than the
     applicable ratio set forth below:

     ---------------------------------------------------------------------------
                                                         Applicable Consolidated
     Consolidated EBITDAR Period:                           Indebtedness Ratio
     ---------------------------------------------------------------------------
     Two consecutive fiscal quarters ending
     June 30, 2004                                               9.30:1.00
     ---------------------------------------------------------------------------
     Three consecutive fiscal quarters ending
     September 30, 2004                                          8.20:1.00
     ---------------------------------------------------------------------------
     Four consecutive fiscal quarters ending
     December 31, 2004                                           8.10:1.00
     ---------------------------------------------------------------------------
     Four consecutive fiscal quarters ending
     March 31, 2005                                              7.10:1.00
     ---------------------------------------------------------------------------
     Four consecutive fiscal quarters ending
     June 30, 2005                                               6.30:1.00
     ---------------------------------------------------------------------------
     Four consecutive fiscal quarters ending
     September 30, 2005                                          6.20:1.00
     ---------------------------------------------------------------------------
     Four consecutive fiscal quarters ending
     December 31, 2005                                           6.00:1.00
     ---------------------------------------------------------------------------

provided, that for purposes of this Section 6.4(d), Consolidated EBITDAR of
Group shall be calculated using an assumed cost of jet fuel consumed in both
mainline and express operations for the relevant period rather than the actual
cost of such jet fuel for the relevant period. For avoidance of doubt any actual
gains or losses from fuel cost hedging activities (including any related to
accounting ineffectiveness adjustments) will not be included in the calculation
of Consolidated EBTIDAR of Group when using assumed cost of jet fuel. Such
assumed cost referred to for any period shall be the product of the amount set
forth opposite such period in the table below multiplied by the actual gallons

                                       7

<PAGE>

consumed in both mainline and express operations in such period, and all such
amounts shall be deemed to include taxes payable in connection with the
purchase, sale or consumption of fuel:

            ------------------------------------------------
                                    Assumed Fuel Cost
             Period:                (per gallon)
            ------------------------------------------------
            January 2004             $0.924
            ------------------------------------------------
            February 2004            $0.924
            ------------------------------------------------
            March 2004               $0.856
            ------------------------------------------------
            April 2004               $0.856
            ------------------------------------------------
            May 2004                 $0.856
            ------------------------------------------------
            June 2004                $0.856
            ------------------------------------------------
            July 2004                $0.857
            ------------------------------------------------
            August 2004              $0.857
            ------------------------------------------------
            September 2004           $0.857
            ------------------------------------------------
            October 2004             $0.857
            ------------------------------------------------
            November 2004 through
            December 2005            $0.858
            ------------------------------------------------

          (v) Section 6.4 of the Loan Agreement is hereby further amended by
     inserting the following new subsection immediately following the newly
     added Section 6.4(d):

     "(e) The parties hereto acknowledge that the Borrower's business plan as of
     the Second Amendment Effective Date provides for the delivery of 25
     Bombardier CRJ 701 aircraft (the "701 Aircraft") in Fiscal Year 2004 and
     Fiscal Year 2005 (of which 20 are expected to be delivered in Fiscal Year
     2004). Under such current business plan, the 701 Aircraft are to be
     operated by one or more third party carriers under capacity purchase
     agreements. If and to the extent any one or more of the 701 Aircraft shall
     be operated by Group or its wholly-owned Subsidiaries (as opposed to a
     third party carrier), the Borrower, the Board and the Lenders agree to
     negotiate in good faith to adjust the ratios set forth in this Section 6.4
     to the extent necessary to maintain the intended economics of the
     covenants."

          (i) Amendment to Section 6.5 of the Loan Agreement. Section 6.5(a) of
the Loan Agreement is hereby amended by inserting the following text immediately
prior to the period at the end of such section:

     "; and provided further that nothing contained in this Section 6.5(a) shall
     prohibit any Obligor from receiving consideration otherwise permitted to be
     received under the terms of this Agreement in respect of Asset Sales"

          (j) Amendment to Section 6.13 of the Loan Agreement. Section 6.13 of
the Loan Agreement is hereby amended and restated in its entirety as follows:

                                       8

<PAGE>

         "Section 6.13 Asset Sales. Neither Group nor the Borrower will, and
         they will not permit any other Obligor to, directly or indirectly,
         consummate any Asset Sale unless (a) the consideration received in
         respect of such Asset Sale is at least equal to the Fair Market Value
         of the assets subject to such Asset Sale, and (b) either (i) at least
         85% of the value of the consideration received by Group or such other
         Obligor in respect of such Asset Sale is in the form of any combination
         of the following: (A) cash or Cash Equivalents, (B) Aircraft Related
         Equipment or other assets to be owned by and used in the business of
         Group or any other Obligor, and (C) the assumption by the Person
         acquiring the assets in such Asset Sale of Indebtedness or Trade
         Payables of Group or any other Obligor with the effect that the
         Obligors will no longer have any obligation with respect to such
         Indebtedness or Trade Payables or (ii) each of the following conditions
         is satisfied:

                           (A) At least 85% of the value of the consideration
                  received by Group or such other Obligor in respect of such
                  Asset Sale consists of any combination of cash, Cash
                  Equivalents, and Non-Cash Instruments (the "85% Test", and any
                  Asset Sale the consideration for which includes a Non-Cash
                  Instrument, a "Specified Asset Sale").

                           (B) The assets sold are limited to Eligible Assets.

                           (C) On or before June 30, 2005, the applicable
                  Obligor has either (x) entered into definitive agreements for
                  the Specified Asset Sale (with the only material conditions to
                  closing being regulatory and airport authority approval and
                  other third party consents and authorizations typically
                  obtained during the period between signing and closing in sale
                  transactions involving property of the type to be sold in the
                  Specified Asset Sale) or (y) has entered into a non-binding
                  letter of intent with the proposed purchaser obligating the
                  parties to proceed diligently and in good faith toward
                  concluding binding agreements with respect to such proposed
                  Specified Asset Sale and the parties enter into definitive
                  agreements with respect to such proposed Specified Asset Sale
                  (with the only material conditions to closing being regulatory
                  and airport authority approval and other third party consents
                  and authorizations typically obtained during the period
                  between signing and closing in sale transactions involving
                  property of the type to be sold in the Specified Asset Sale)
                  on or before September 30, 2005.

                           (D) The Boards of Directors of the Borrower and Group
                  shall have received from a nationally recognized investment
                  bank or firm of valuation experts selected by them and
                  reasonably acceptable to the Board an opinion, in form and
                  substance reasonably acceptable to the Board, to the effect
                  that Group (or its applicable Subsidiary) is receiving fair
                  consideration for the assets being sold, such opinion to be

                                       9

<PAGE>

                  subject to customary limitations and qualification for
                  opinions of this type.

                           (E) Any Non-Cash Instrument received by Group or its
                  Subsidiaries in connection with a Specified Asset Sale and
                  necessary to satisfy the 85% Test shall have an amortization,
                  installment, rent or similar schedule requiring the issuer
                  thereof to make payments to Group or its Subsidiaries at a
                  rate no slower on a percentage basis than the original
                  amortization schedule for the Loan.

                           (F) Any provisions of Section 2.6(b) to the contrary
                  notwithstanding, the Borrower shall prepay the Loan in an
                  aggregate amount equal to one hundred percent (100%) of the
                  cash payments (including interest payments) received by Group
                  or its Subsidiaries in respect of such Non-Cash Instruments.
                  Any such prepayment shall be applied ratably against the
                  Tranche A and Tranche B portions of the Loan. Within each
                  tranche, such payments shall be applied pro rata against the
                  remaining scheduled principal payments on the Loan (as such
                  scheduled payments have been adjusted as a result of previous
                  payments and prepayments), including, if such payment is
                  received on a date that the Borrower is obligated to make a
                  principal payment on the Loan in accordance with Section 2.3,
                  against the payment due on such date.

                           (G) Any Non-Cash Instrument (including the proceeds
                  therefrom), any other non-cash consideration (and proceeds),
                  and any cash consideration to the extent not used to prepay
                  the Loan which is received by Group or its Subsidiaries in
                  connection with any such Specified Asset Sale shall be pledged
                  on a first priority basis to the Collateral Agent to secure
                  the Obligations in accordance with the terms of the Loan
                  Agreement and such pledge shall be perfected.

                           (H) Any Non-Cash Instruments applied toward the 85%
                  Test shall be secured by a perfected first priority security
                  interest in all of the Eligible Assets sold.

                           (I) Immediately prior to (or, at the Borrower's
                  option, shortly after and in any event within 30 days after)
                  the time of execution and delivery of definitive documentation
                  (the "Determination Date") relating to a Specified Asset Sale,
                  the Borrower shall cause Fitch to provide (i) a pro forma
                  rating on the Loan (the "Applicable Loan Rating"), such pro
                  forma rating to be made after giving effect to the
                  consummation of such Specified Asset Sale and voluntary
                  prepayments of the Loan made prior to, in connection with or
                  relating to such Specified Asset Sale and any other
                  modifications of the Loan Agreement made prior to, in
                  connection with or relating to, such Specified Asset Sale
                  (collectively with such Specified Asset Sale, the

                                       10

<PAGE>

                  "Related Transactions") and (ii) the Adjusted Applicable Loan
                  Rating (as defined below). Any Specified Asset Sale shall be
                  permitted if the Applicable Loan Rating as of the
                  Determination Date with respect to such Specified Asset sale
                  is at least equal to or better than each of (i) the Initial
                  Loan Rating and (ii) the Adjusted Applicable Loan Rating. As
                  used herein, (x) "Initial Loan Rating" means the pro forma
                  rating of the Loan provided by Fitch and measured as
                  the date immediately prior to the Second Amendment Effective
                  Date, such rating to be determined assuming that the Initial
                  Optional Prepayment had not been and is not required to be
                  made and therefore that the Loan amortization schedule would
                  be identical to the Loan amortization schedule as of January
                  31, 2004, but that the Second Amendment had otherwise become
                  effective, or, if lower, the Fitch rating of the ATSB Loan as
                  of December 19, 2003, and (y) "Adjusted Applicable Loan
                  Rating" means the pro forma rating of the Loan provided by
                  Fitch as of the Determination Date, such rating to be
                  determined (1) without giving effect to the consummation of
                  the Related Transactions and (2) assuming that neither the
                  Initial Optional Prepayment nor any other prepayment after
                  January 31, 2004 and on or prior to the applicable
                  Determination Date had been made and therefore that the Loan
                  amortization schedule would be identical to the Loan
                  amortization schedule as of January 31, 2004.

                           (J) All documentation, including customary legal
                  opinions for transactions of the type, related to the
                  applicable Non-Cash Instrument, the security therefor and the
                  pledge thereof to the Collateral Agent (the "Instrument
                  Documentation") shall be reasonably satisfactory to the
                  Collateral Agent and the Board and in any event shall contain
                  the Mandatory Document Provisions set forth on Schedule 6.13.

                           (K) There exists no Default or Event of Default and
                  none would result from the consummation of the Specified Asset
                  Sale.

                           (L) The Board shall have the right, without the
                  consent of the Borrower or the issuer of any Non-Cash
                  Instrument, to effectuate a sale of such Non-Cash Instrument,
                  together with all related Instrument Documentation, and apply
                  the Net Cash Proceeds received from such sale to prepay the
                  Loan; provided that (a) the consideration received in such
                  sale shall consist solely of cash and shall be in an amount at
                  least equal to (i) the par value (or, with respect to a
                  zero-coupon or similar instrument, the accreted value) of such
                  Non-Cash Instrument plus (ii) accrued and unpaid interest
                  thereon, (b) every aspect of such sale, including the method,
                  manner, time, place, and other terms, shall be commercially
                  reasonable, (c) such sale shall be consummated pursuant to a
                  written purchase-and-sale agreement providing for at least
                  ninety (90) days

                                       11

<PAGE>

         between the execution of such agreement and the closing of the
         transaction, (d) the Board shall deliver a copy of any such purchase-
         and-sale agreement to the Borrower promptly, but in any event within
         two (2) Business Days, following execution thereof, (e) any such
         purchase-and-sale agreement shall be expressly subject to the
         Borrower's right to procure, within ninety (90) days after execution of
         such purchase-and-sale agreement, an equal or higher cash offer for the
         Non-Cash Instrument and to sell the Non-Cash Instrument to the Person
         that made such equal or higher cash offer, and (f) in no event shall a
         Non-Cash Instrument be sold to an airline, a commercial aircraft
         operator, an air freight forwarder, an entity engaged in the business
         of parcel transport by air, or other similar Person, or any Affiliate
         of any of the foregoing. No breakage costs or other charges which would
         otherwise be payable as a result of the application of Section 2.10(e)
         shall be payable in connection with any prepayment made pursuant to
         this clause (L)."

              (k) Schedule 6.13 to Loan Agreement. Schedule 6.13 to this
Amendment is hereby attached in its entirety as Schedule 6.13 to the Loan
Agreement.

         Section 3. Initial Loan Rating. As soon as practicable, but in any
event within sixty (60) days after the Second Amendment Effective Date, the
Borrower shall cause Fitch to provide the Initial Loan Rating.

         Section 4. Release of Aircraft Engine. The Collateral Agent is hereby
authorized and instructed to, and hereby does, release all of its right, title
and interest in and to the following described collateral (the "Released
Collateral") from the Lien of the Borrower Aircraft Mortgage: Engine
Manufacturer: CFM International; Engine Model: CFM56-3B; Serial Number: 722111.
The Collateral Agent is hereby authorized and instructed to, and shall from time
to time, at the Borrower's expense, provide such instruments and documents as
the Borrower reasonably requests in order to effectuate or evidence the release
of the Released Collateral from the Lien of the Borrower Aircraft Mortgage. The
Collateral Agent, the Board and the Lenders acknowledge that, notwithstanding
any provision of any Loan Document to the contrary, the Borrower may transfer or
assign all of its right, title and interest in the Released Collateral to an
aircraft lessor to the Borrower in connection with the performance by the
Borrower of certain of its obligations under a Contractual Obligation with such
aircraft lessor.

         Section 5. Conditions to Effectiveness. This Amendment shall become
effective on March 12, 2004 (the "Second Amendment Effective Date") upon the
satisfaction of the condition precedent that each of the parties hereto shall
have received counterparts of this Amendment duly executed and delivered by each
of the other parties hereto.

         Section 6. Consent to Execution. By their respective signatures hereto,
each of the parties hereto hereby consents to the execution of this Amendment.

         Section 7. Representations and Warranties. Each of Group and the
Borrower represents and warrants to each other party hereto (excluding any other

                                       12

<PAGE>

Obligors) that: (a) it has all requisite corporate power and authority to enter
into this Amendment and to carry out the transactions contemplated hereby, (b)
it has duly authorized by all necessary corporate action the execution, delivery
and performance of this Amendment, (c) this Amendment and the Loan Agreement as
amended hereby are the valid and binding obligations of each of Group and the
Borrower, enforceable against it in accordance with its respective terms, except
as may be limited by bankruptcy, insolvency, reorganization, moratorium,
fraudulent transfer or other similar laws relating to or affecting the
enforcement of creditors' rights generally, including materiality,
reasonableness, good faith and fair dealing, and by general principles of equity
(regardless of whether considered in a proceeding in equity or at law), and (d)
after giving effect to this Second Amendment, no Default or Event of Default has
occurred and is continuing. Each of the Obligors hereby acknowledges the
continuing effectiveness of Section 11.19 of the Loan Agreement and its
potential application in the context of any Specified Asset Sale.

         Section 8. Reference to and Effect on the Loan Documents.

         (a)  On and after the effectiveness of this Amendment, each reference
in the Loan Agreement to "this Agreement", "hereunder", "hereof" or words of
like import referring to the Loan Agreement, and each reference in the other
like Documents to "the Loan Agreement", "thereunder", "thereof" or words of like
import referring to the Loan Agreement, shall mean and be a reference to the
Loan Agreement as amended by this Amendment.

         (b)  Notwithstanding anything contained in this Amendment, the terms of
this Amendment are not intended to and do not serve to effect a novation as to
the Loan Agreement. The parties to this Amendment expressly do not intend to
extinguish the Loan Agreement. Instead, it is the express intention of the
parties to this Amendment to reaffirm the obligations created under the Loan
Agreement. Each of the Loan Agreement, as amended hereby, the Slot Security
Agreement, as amended hereby, the other Loan Documents, and the Board Guaranty
remains in full force and effect and the terms and provisions of the Loan
Agreement, as amended hereby, the Slot Security Agreement, as amended hereby,
the other Loan Documents, and the Board Guaranty are hereby ratified and
confirmed.

         Section 9. Consent of Guarantor; Confirmation of Guaranty. Each of
Group and the Subsidiary Guarantors hereby consents to this Amendment and hereby
confirms and agrees that (a) notwithstanding the effectiveness of this
Amendment, the Guaranty is, and shall continue to be, in full force and effect
and is hereby ratified and confirmed in all respects, except that, on and after
the effectiveness of this Amendment, each reference in the Guaranty to the
"Agreement", "thereunder", "thereof" or words of like import referring to the
Loan Agreement shall mean and be a reference to the Loan Agreement as amended by
this Amendment, and (b) the Collateral Documents to which it is a party and all
of the Collateral described therein do, and shall continue to, secure the
payment of all of the Secured Obligations (in each case, as defined therein).

         Section 10. Costs; Expenses. The Borrower agrees to pay on demand all
reasonable costs and expenses of the Board, the Agents, and the Lenders in
connection with the preparation, execution, delivery and administration,
modification and amendment of this Amendment and the other instruments and
documents to be delivered hereunder (including, without limitation, the
reasonable fees and expenses of counsel for

                                       13

<PAGE>

the Board, the Agents, and the Lenders) in accordance with the terms of Section
11.3 of the Loan Agreement.

         Section 11. Execution in Counterparts. This Amendment may be executed
in any number of counterparts and by different parties hereto in separate
counterparts, each of which when so executed shall be deemed to be an original
and all of which taken together shall constitute one and the same agreement.
Delivery of an executed counterpart of a signature page to this Amendment by
telecopier shall be effective as delivery of a manually executed counterpart of
this Amendment.

         Section 12. Governing Law. THIS AGREEMENT AND THE RIGHTS AND
OBLIGATIONS OF THE PARTIES HERETO SHALL BE GOVERNED BY, AND CONSTRUED IN
ACCORDANCE WITH, THE LAW OF THE STATE OF NEW YORK; PROVIDED, THAT IN THE EVENT
THE BOARD BECOMES A LENDER PURSUANT TO THE BOARD GUARANTY, THE RIGHTS AND
OBLIGATIONS OF THE BOARD HEREUNDER SHALL BE GOVERNED BY, AND CONSTRUED IN
ACCORDANCE WITH, THE FEDERAL LAW OF THE UNITED STATES OF AMERICA, IF AND TO THE
EXTENT SUCH FEDERAL LAW IS APPLICABLE, AND OTHERWISE IN ACCORDANCE WITH THE LAW
OF THE STATE OF NEW YORK.

         Section 13. Release. The Obligors further acknowledge and agree that
they have no claims, counterclaims, offsets, or defenses to the Loan Documents
or any transaction related thereto or the performance of the Obligors'
obligations thereunder. To the extent the Obligors have any such claims,
counterclaims, offsets, or defenses to the Loan Documents or any transaction
related thereto or the performance of the Obligors' obligations thereunder, the
same are hereby waived, relinquished and released in consideration of the
Board's, the Lenders' and the Agents' execution and delivery of this Amendment.

                            [Signature Pages Follow]

                                       14

<PAGE>

     IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be
executed by their respective officers thereunto duly authorized, as of the date
first above written.

                                         US AIRWAYS, INC.

                                         By: /s/ Neal S. Cohen
                                             -----------------------------------
                                         Name:   Neal S. Cohen
                                         Title:  Executive Vice President -
                                                 Finance and Chief Financial
                                                 Officer

                                         US AIRWAYS GROUP, INC.

                                         By: /s/ Neal S. Cohen
                                             -----------------------------------
                                         Name:   Neal S. Cohen
                                         Title:  Executive Vice President -
                                                 Finance and Chief Financial
                                                 Officer

<PAGE>

MIDATLANTIC AIRWAYS, INC.

By: /s/ Eilif Serck-Hanssen
    -------------------------------------
Name:   Eilif Serck-Hanssen
Title:  Treasurer

ALLEGHENY AIRLINES, INC.

By: /s/ Keith D. Houk
    -------------------------------------
Name:   Keith D. Houk
Title:  President

US AIRWAYS LEASING AND SALES, INC.

By: /s/ Eilif Serck-Hanssen
    -------------------------------------
Name:   Eilif Serck-Hanssen
Title:  Treasurer

MATERIAL SERVICES COMPANY, INC.

By: /s/ Scott Strohm
    -------------------------------------
Name:   Scott Strohm
Title:  VP Finance

PSA AIRLINES, INC.

By: /s/ Richard E Pfennig
    -------------------------------------
Name:   Richard E. Pfennig
Title:  President/CEO

PIEDMONT AIRLINES, INC.

By: /s/  John F. Leonard
    -------------------------------------
Name:   John F. Leonard
Title:  President

<PAGE>

YC SUSI TRUST,
as Primary Tranche A Lender

By: Bank of America, National Association,
as Administrative Trustee

By: /s/ Jeffrey Fricano
    -------------------------------------
Name:   Jeffrey Fricano
Title:  Vice President

BANK OF AMERICA, N.A.,
as Alternate Tranche A Lender

By: /s/ Jeffrey Fricano
    -------------------------------------
Name:   Jeffrey Fricano
Title:  Vice President

BANK OF AMERICA, N.A.,
as a Tranche B Lender

By: /s/ Charles L. Ruifrok, Jr.
    -------------------------------------
Name:   Charles L. Ruifrok, Jr., CFA
Title:  Vice President

BANK OF AMERICA, N.A.,
as Agent and Collateral Agent

By: /s/ Liliana Claar
    -------------------------------------
Name:   Liliana Claar
Title:  Vice President

BANK OF AMERICA, N.A.,
as KHFC Administrative Agent

By:______________________________________
Name:
Title:

RETIREMENT SYSTEMS OF
ALABAMA HOLDINGS LLC,
as a Tranche B Lender

By: /s/ David G. Bronner
    -------------------------------------
Name:   David G. Bronner
Title:  Manager

<PAGE>

AIR TRANSPORTATION
STABILIZATION BOARD

By: /s/ Michael Kestenbaum
    -------------------------------------
Name:   Michael Kestenbaum
Title:  Executive Director

<PAGE>

                                                                   Schedule 6.13

                            Mandatory Document Terms

..    Secured Transaction Documentation. The Instrument Documentation shall serve
     to collectively give the transferring Obligors a perfected first-priority
     security interest in all of the Eligible Assets subject to the Asset Sale.

..    Lease Documentation. Each applicable Obligor shall retain title to the
     Eligible Assets subject to lease throughout the term of the applicable
     lease agreement. The Collateral Documents and the Collateral Agent's Lien
     on the Eligible Assets subject to lease shall remain in full force and
     effect.

..    Assignment of Rights under Instrument Documentation. The Instrument
     Documentation and any and all security interests in favor of Obligors
     created thereby shall be assigned to the Collateral Agent pursuant to the
     Collateral Documents as security for all outstanding Obligations.

..    Collateral Agent Appointed Attorney-In-Fact. Each Obligor involved in the
     Asset Sale will appoint the Collateral Agent as its attorney-in-fact with
     full authority to ask for, require, demand and receive all monies due or to
     become due under the Non-Cash Instrument or to take any action or institute
     any proceedings to enforce such Non-Cash instrument as the Collateral Agent
     deems necessary, subject always to the following:

          .    Unless an "Event of Default" (as defined in the Instrument
               Documentation) has occurred and is continuing, the Collateral
               Agent shall not interfere with the issuer's rights of quiet
               enjoyment under the Instrument Documentation;

          .    so long as no Event of Default has occurred and is continuing (i)
               the Collateral Agent shall have the exclusive right, after
               consultation with the Borrower, to exercise any and all remedies
               under the Instrument Documentation at any time an "Event of
               Default" (as defined in the Instrument Documentation) has
               occurred and is continuing thereunder as a result of the
               bankruptcy or insolvency of the issuer or as the result of the
               issuer's failure to make any payment of principal or interest
               thereunder; and (ii) the Borrower shall have the exclusive right,
               after consultation with the Collateral Agent, to exercise any and
               all remedies under the Instrument Documentation at any time an
               "Event of Default" (as defined in the Instrument Documentation)
               other than those described in the preceding clause (i) has
               occurred and is continuing thereunder; and

          .    at any time an Event of Default has occurred and is continuing,
               the Collateral Agent shall have the right, to the exclusion of
               the Obligors but subject to the issuer's right of quiet
               enjoyment, if any, to exercise any and all remedies under the
               Instrument Documentation.

..    No Waivers or Amendments. None of the Obligors shall, without the prior
     written consent of the Board or, if the Board Guarantee is no longer in
     effect, the Requisite Lenders, agree to any waiver or amendment of certain
     material provisions of the Instrument Documentation to be agreed upon in
     accordance with Section 6.13(ii)(J).

..    Payments to the Agent. The obligor under any Non-Cash Instrument shall be
     irrevocably directed to make payments of all amounts required to be paid
     thereunder directly to the Agent in the manner provided in Section 2.9.

<PAGE>

..    Slot Covenants. Instrument Documentation in respect of any transfer of
     Slots shall contain covenants not less stringent than the covenants
     contained in Sections 5.1(xxi) and 5.16 of the Loan Agreement and Section
     6(a) of the Slot Security Agreement in respect of any transferred Slots.

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