Document:

EXHIBIT 10.26

          FIRST AMENDMENT TO SENIOR SECURED REVOLVING CREDIT AGREEMENT

     THIS FIRST AMENDMENT TO SENIOR SECURED REVOLVING CREDIT AGREEMENT, dated as
of January 9, 2002 (the "Amendment"), is by and between MIDWEST EXPRESS
HOLDINGS, INC. (the "Borrower"), the lenders party hereto and U.S. BANK NATIONAL
ASSOCIATION, d/b/a FIRSTAR BANK, N.A. as Agent (the "Agent").

                                    RECITALS

     WHEREAS, the Borrower is party to that certain Senior Secured Revolving
Credit Agreement, dated as of August 31, 2001 (the "Credit Agreement"), by and
among the Borrower, the lenders party thereto (each, a "Lender" and
collectively, the "Lenders") and the Agent; and

     WHEREAS, the Borrower, the Agent and the Lenders party hereto desire to
amend the Credit Agreement as set forth herein.

     IN CONSIDERATION of the mutual covenants, conditions and agreements set
forth herein, and for other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, it is hereby agreed that:

                                   ARTICLE I

                                   DEFINITIONS

     Capitalized terms used in this Amendment but not defined herein shall have
the definitions assigned in the Credit Agreement.

                                   ARTICLE II

                                   AMENDMENTS

     The Credit Agreement is amended as follows:

     2.1 Section 1 - Definitions. Section 1 is amended by creating a new
definition entitled "Availability" to be inserted in the appropriate
alphabetical order and to read as follows:

          "Availability" means the result of: (i) the lesser of (a)
     the Borrowing Base and (b) the aggregate of the Revolving
     Committed Amounts, minus (ii) the sum of (x) the aggregate amount
     of all outstanding Revolving Loans, plus (y) the aggregate amount
     of all outstanding LOC Obligations, plus (z) the aggregate amount
     of all outstanding Swing Line Loans.

     2.2 Section 1 - Definitions - Borrowing Base. The definition of "Borrowing
Base" contained in Section 1 is amended in its entirety to read as follows:

<PAGE>

          "Borrowing Base" means the sum of (i) the Personal Property
     Borrowing Base and (ii) the Real Property Borrowing Base.

     2.3 Section 1 - Definitions - Consolidated Net Income. The definition of
"Consolidated Net Income" Section 1 is amended in its entirety to read as
follows:

          "Consolidated Net Income" means for any period, the net
     income of the Borrower and its Subsidiaries on a consolidated
     basis determined in accordance with GAAP applied on a consistent
     basis, but excluding those asset impairment charges, if any,
     which the Agent and the Required Banks may agree in writing to
     exclude. The applicable period shall be for the four consecutive
     quarters ending on the date of computation, unless otherwise
     expressly stated herein.

     2.4 Section 1 - Definitions - Credit Documents. The definition of "Credit
Documents" contained in Section 1 is amended in its entirety to read as follows:

          "Credit Documents" means the Credit Agreement, the Notes,
     the Guaranty, the Parent Security Agreement, the Subsidiary
     Security Agreement, the Aircraft Security Agreement, the Parent
     Pledge Agreement, the Subsidiary Pledge Agreement, the Mortgage
     (upon execution and delivery thereof), any LOC Document, and all
     other related agreements and documents issued or delivered
     hereunder or thereunder or pursuant hereto or thereto.

     2.5 Section 1 - Definitions. Section 1 is amended by creating a new
definition entitled "Eligible Account" to be inserted in the appropriate
alphabetical order and to read as follows:

          "Eligible Account" shall mean an account receivable owing to
     the Borrower or a Guarantor which:

          (i) arose from the performance of services by the Borrower
     or applicable Guarantor or from a bona fide sale of goods which
     have been delivered or shipped to the account debtor and for
     which the Borrower or such Guarantor has genuine invoices,
     shipping documents or receipts;

          (ii) is payable thirty (30) days or less after the earliest
     of performance of services, delivery of goods or date of
     invoices, and is not more than ninety (90) days past due;

          (iii) is genuine and enforceable against the account debtor
     for the full amount thereof and is not subject to any setoff,
     credit, allowance or adjustment;

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<PAGE>

          (iv) is owed by an account debtor which is located in the
     United States or Canada;

          (v) is owed by an account debtor which has neither returned
     the goods nor disputed its liability with respect to such account
     receivable;

          (vi) is owed by an account debtor as to whom neither the
     Borrower nor any Guarantor has no actual notice or actual
     knowledge of anything which might impair its credit standing;

          (vii) is an account with respect to which the account debtor
     is not the subject of bankruptcy or a similar insolvency
     proceeding or has not made an assignment for the benefit of
     creditors or whose assets have not been conveyed to a receiver or
     trustee;

          (viii) does not arise out of a transaction in which a bond
     has been issued guaranteeing the performance of the Borrower or
     applicable Guarantor;

          (ix) is owned by the Borrower or applicable Guarantor free
     and clear of any Liens (other than those of the Agent for the
     benefit of the Lenders and those permitted by subsections (iii),
     (iv) and (xiii) of the definition of "Permitted Liens");

          (x) is not owed by an account debtor who is obligated on
     accounts receivable owed to the Borrower or applicable Guarantor
     more than 10% of the aggregate unpaid balance of which have been
     past due for longer than the relevant period specified in
     subsection (ii) above;

          (xi) is an account receivable on which the Agent shall have
     a first priority perfected Lien thereon for the benefit of the
     Lenders;

          (xii) is owed by an account debtor which is not the United
     States of America, any state, municipality or any branch,
     department or agency thereof;

          (xiii) is not an account with respect to which the account
     debtor's obligation to pay the amount is conditional upon the
     account debtor's approval or is otherwise subject to any
     repurchase obligation or return rights; and

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<PAGE>

          (xiv) is not an account with respect to which the account
     debtor is an Affiliate of the Borrower or any Guarantor.

     2.6 Section 1 - Definitions. Section 1 is amended by creating a new
definition entitled "Eligible Inventory" to be inserted in the appropriate
alphabetical order and to read as follows:

          "Eligible Inventory" shall mean inventory that meets these
     specifications:

          (i) it is owned by one or more of the Borrower and the
     Guarantors free of all Liens (other than the Lien of the Agent
     for the benefit of the Lenders and any Lien permitted by
     subsections (iii), (iv) and (xiii) of the definition of
     "Permitted Liens");

          (ii) no UCC filing is on file covering its products or
     proceeds (other than those of the Agent for the benefit of the
     Lenders and those permitted by subsections (iii), (iv) and (xiii)
     of the definition of "Permitted Liens");

          (iii) it is in good condition and not obsolete; and

          (iv) the Agent shall have a first priority perfected Lien
     thereon for the benefit of the Lenders.

     2.7 Section 1 - Definitions. Section 1 is amended by creating a new
definition entitled "Eligible Other Equipment" to be inserted in the appropriate
alphabetical order and to read as follows:

          "Eligible Other Equipment" means all equipment other than
     the aircraft and engines listed on Schedule 1.1 and office
     equipment and furniture that meet these specifications:

          (i) it is owned by one or more of the Borrower and the
     Guarantors free of all Liens (other than the Lien of the Agent
     for the benefit of the Lenders and any Lien permitted by
     subsections (iii), (iv) and (xiii) of the definition of
     "Permitted Liens");

          (ii) no UCC or FAA filing is on file covering its products
     or proceeds (other than those of the Agent for the benefit of the
     Lenders and those permitted by subsections (iii), (iv) and (xiii)
     of the definition of "Permitted Liens");

          (iii) it is in good condition; and

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<PAGE>

          (iv) the Agent shall have a first priority perfected Lien
     thereon for the benefit of the Lenders.

     2.8 Section 1 - Definitions. Section 1 is amended by creating a new
definition entitled "Gross Exposure" to be inserted in the appropriate
alphabetical order and to read as follows:

          "Gross Exposure" means Gross Exposure as defined in the Card
     Processing Agreement or any comparable term in any Replacement
     Card Processing Agreement.

     2.9 Section 1 - Definitions. Section 1 is amended by creating a new
definition entitled "Mortgage" to be inserted in the appropriate alphabetical
order and to read as follows:

          "Mortgage" means the Mortgage, Security Agreement and
     Fixture Filing granting the Agent a Lien on the headquarters of
     the Borrower located at 6744 South Howell Avenue, Oak Creek,
     Wisconsin.

     2.10 Section 1 - Definitions. Section 1 is amended by creating a new
definition entitled "Personal Property Borrowing Base" to be inserted in the
appropriate alphabetical order and to read as follows:

          "Personal Property Borrowing Base" means the lesser of (1)
     $45,000,000 and (ii) the sum of (a) 51% of Appraisal Value of
     Eligible DC-9 Aircraft, (b) 75% of Appraisal Value of Eligible
     Other Aircraft, (c) 80% of the face amount of Eligible Accounts,
     (d) 50% of the net book value of Eligible Inventory, and (e) 50%
     of the net book value of Eligible Other Equipment.

     2.11 Section 1 - Definitions. Section 1 is amended by creating a new
definition entitled "Real Property Borrowing Base" to be inserted in the
appropriate alphabetical order and to read as follows:

          "Real Property Borrowing Base" means (i) $0.00 prior to the
     date that the Borrower shall have complied fully with Section 4.3
     of this Agreement, and (ii) after the date that the Borrower
     shall have complied fully with Section 4.3 of this Agreement, the
     lesser of (a) $10,000,000 and (b) 75% of the result of (1) the
     appraised value of the real property covered by the Mortgage
     minus (2) the AAL Loan.

     2.12 Section 1 - Definitions - Replacement Card Processing Agreement. The
definition of "Replacement Card Processing Agreement" contained in Section 1 is
amended in its entirety to read as follows:

          "Replacement Card Processing Agreement" means (i) the Card
     Processing Agreement, after giving effect to any amendment,

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<PAGE>

     modification or restatement thereof after the Closing Date, or
     (ii) any new agreement between a Replacement Card Processor and
     Midwest Express Airlines to provide card processing services for
     Midwest Express Airlines substantially comparable to the services
     provided by the Card Processor under the Card Processing
     Agreement (as the same may be amended, restated or modified),
     containing terms and conditions substantially comparable or less
     burdensome to Midwest Express Airlines to those set forth in the
     Card Processing Agreement.

     2.13 Section 4.3 - Conditions to Implementation of Real Property Borrowing
Base. A new Section 4.3 is added to the Credit Agreement to read as follows:

          4.3 Conditions to Implementation of Real Property Borrowing
     Base. The implementation of the Real Property Borrowing Base
     shall occur upon the receipt by the Agent of the following
     documents, all in form and substance reasonably satisfactory to
     the Agent and the Required Lenders:

          (a) the Mortgage duly executed by Midwest Express Airlines;

          (b) a lender's title insurance policy in an amount not less
     than the appraised value (as determined by the appraisal required
     under Section 4.3(c) below) from a title insurance company
     acceptable to the Agent and the Lenders insuring that Midwest
     Express Airlines is the owner of the real property of Midwest
     Express Airlines described in the Mortgage and disclosing no
     Liens other than Permitted Liens and with such endorsements and
     affirmative coverages as the Agent or the Lenders may reasonably
     require;

          (c) an appraisal by an appraiser satisfactory to the Agent
     and the Lenders covering the real property of Midwest Express
     Airlines described in the Mortgage and which complies with the
     Uniform Standards of Professional Appraisal Practice and with all
     regulatory requirements for appraisals applicable to the Lenders
     and which appraisal may be relied upon by Aid Association for
     Lutherans;

          (d) a current survey of the real property of Midwest Express
     Airlines described in the Mortgage certified to the Agent and the
     title insurance company by a surveyor acceptable to the Agent and
     the Lenders and prepared in accordance with the "minimum Standard
     Detail Requirements" for ALTA/ACSM Land Title Surveys, certifying
     that the improvements on the real estate

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<PAGE>

     are not in a flood plain and covering such other matters as the
     Agent may reasonably request;

          (e) a phase I environmental audit covering the real property
     of Midwest Express Airlines described in the Mortgage revealing
     no environmental condition other than those reasonably acceptable
     to the Agent and the Lenders;

          (f) a consent from Aid Association for Lutherans consenting
     to the execution and delivery of the Mortgage by Midwest Express
     Airlines; and

          (g) such additional documents and materials as the Agent or
     Required Lenders may reasonably request.

     2.14 Section 6.4(h) - Reporting Requirements. A new Section 6.4(h) of the
Credit Agreement is created to read as follows:

          (h) On Tuesday of each week (and on the next Business Day of
     any week in which Tuesday is not a Business Day) an executed
     certificate in the form of Exhibit 6.4(h) containing information
     as of the preceding Friday.

     2.15 Section 7.13 - Minimum Cash Balances. A new Section 7.13 of the Credit
Agreement is created to read as follows:

          7.13 Minimum Cash Balances. The Borrower shall not permit
     the sum of its and the Guarantors' aggregate balances of cash and
     cash equivalents (including the Deposit (as defined in the Card
     Processing Agreement) and any substantially similar deposit,
     reserve or holdback under any Replacement Card Processing
     Agreement but excluding any other holdback, escrow or similar
     reserve of funds by any other credit card processor) plus the
     Availability to be less than $25,000,000 at any time.

     2.16 Section 8(d) - Events of Default. Section 8(d) of the Credit Agreement
is amended in its entirety to read as follows:

          (d)(i) Borrower shall default in the due performance or
     observance of Section 6.4, 6.11, 6.12, 6.13, 7.3, 7.12 or 7.13,
     or (ii) Borrower or any Guarantor shall default in the observance
     or performance of any other term, covenant or agreement contained
     herein or in any of the other Credit Documents (other than as
     described in subsections 8(a), 8(b), 8(c) or 8(d)(i) above), and
     such default shall continue unremedied for a period of 30 days or
     more after written notice thereof from the Agent or the Required
     Lenders; or

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<PAGE>

     2.17 Section 8(1) - Events of Default. Section 8(1) of the Credit Agreement
is amended in its entirety to read as follows:

          (1) The Card Processing Agreement or any Replacement Card
     Processing Agreement is terminated and not replaced
     simultaneously with a Replacement Card Processing Agreement, an
     "event of default" or "termination event" (after giving effect to
     any applicable grace period or notice period) occurs under the
     Card Processing Agreement or any Replacement Card Processing
     Agreement or there is an immediately effective requirement under
     the Card Processing Agreement or a Replacement Card Processing
     Agreement that the Deposit or Reserved Funds (as both terms are
     defined in the Card Processing Agreement) or any other holdback,
     escrow or similar reserve of funds exceed 75% of the Gross
     Exposure and the Card Processor-or Replacement Card Processor has
     in fact enforced such requirement;

     2.18 Schedule 1.1 - Eligible Aircraft DC-9 Aircraft And Eligible Other
Aircraft. Schedule 1.1 to the Credit Agreement is replaced by Schedule 1.1
attached to this Amendment.

     2.19 Exhibit 4.1(1) - Borrowing Base Certificate. Exhibit 4.1(1) of the
Credit Agreement is replaced by Exhibit 4.1(1) attached to this Amendment.

     2.20 Exhibit 6.4(h) - Cash Balances Certificate. A new Exhibit 6.4(h) is
added to the Credit Agreement in the form of Exhibit 6.4(h) attached to this
Amendment.

                                  ARTICLE III

                         REPRESENTATIONS AND WARRANTIES

     The Borrower hereby represents and warrants to the Agent and the Lenders
that:

     3.1 Credit Agreement. All of the representations and warranties made by the
Borrower in the Credit Agreement are true and correct on the date of this
Amendment. No Default or Event of Default under the Credit Agreement has
occurred and is continuing as of the date of this Amendment.

     3.2 Authorization; Enforceability. The making, execution and delivery of
this Amendment, and performance of and compliance with the terms of the Credit
Agreement, as amended, have been duly authorized by all necessary corporate
action by the Borrower. This Amendment is the valid and binding obligation of
the Borrower, enforceable against the Borrower in accordance with its terms.

     3.3 Absence of Conflicting Obligations. The making, execution and delivery
of this Amendment, and performance of and compliance with the terms of the
Credit Agreement, as amended, do not violate any presently existing provision of
law or the articles of incorporation or

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<PAGE>

bylaws of the Borrower or any agreement to which the Borrower is a party or by
which it is bound.

                                   ARTICLE IV

                                  MISCELLANEOUS

     4.1 Continuance of Credit Agreement. Except as specifically amended by this
Amendment, the Credit Agreement shall remain in full force and effect.

     4.2 Survival. All agreements, representations and warranties made in this
Amendment or in any documents delivered pursuant to this Amendment shall survive
the execution of this Amendment and the delivery of any such document.

     4.3 Governing Law. This Amendment shall be governed by the laws of the
State of Wisconsin.

     4.4 Counterparts; Headings. This Amendment may be executed in several
counterparts, each of which shall be deemed an original, but such counterparts
shall together constitute but one and the same agreement. Article and Section
headings in this Amendment are inserted for convenience of reference only and
shall not constitute a part hereof.

     4.5 Severability. Any provision of this Amendment which is prohibited or
unenforceable in any jurisdiction shall, as to such jurisdiction, be ineffective
to the extent of such prohibition or unenforceability without invalidating the
remaining provisions of this Amendment or affecting the validity or
enforceability of such provision in any other jurisdiction.

     4.6 Effectiveness. This Amendment shall be effective upon the satisfaction
of all of the following conditions:

     (a) receipt by the Agent of this Amendment executed by the Borrower;

     (b) execution and delivery to the Agent of a Reaffirmation of Guarantor by
the Guarantors;

     (c) receipt by the Agent of a Borrowing Base Certificate executed by the
Borrower, dated as of November 30, 2001, giving effect to this Amendment; and

     (d) such additional supporting documents and materials as the Agent or
Lenders may reasonably request.

                                   ARTICLE V

                              RELEASE OF COLLATERAL

     Each of the undersigned Lenders consents to the release of the McDonnell
Douglas DC-9-14 aircraft having the registration number N400ME and the serial
number 45727.

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<PAGE>

     IN WITNESS WHEREOF, the parties hereto have executed this First Amendment
to Senior Secured Revolving Credit Agreement as of the day and year first
written above.

                             MIDWEST EXPRESS HOLDINGS, INC.

                             By: /s/ Robert S. Bahlman
                                 -----------------------------------------------
                             Title: CFO
                                    --------------------------------------------

                             U.S. BANK NATIONAL ASSOCIATION, d/b/a FIRSTAR
                             BANK, N.A. in its capacity as Agent and as a Lender

                             By: /s/ Authorized Representative
                                 -----------------------------------------------
                             Title: Vice President
                                    --------------------------------------------

                             M&I MARSHALL & ILSLEY BANK

                             By: /s/ Authorized Representative
                                 -----------------------------------------------
                             Title: Vice President
                                    --------------------------------------------

                             Attest: /s/ Authorized Representative
                                     -------------------------------------------
                             Title: Vice President
                                    --------------------------------------------

                             BANK ONE, NA (Main Office Chicago)

                             By:
                                 -----------------------------------------------
                             Title:
                                    --------------------------------------------

                                       10
<PAGE>

                            REAFFIRMATION OF GUARANTY

     Each of the undersigned (each a "Guarantor") executed a Subsidiary Guaranty
(each a "Guaranty") dated as of August 31, 2001 in favor of the Lenders (as
defined in each Guaranty) pursuant to which each Guarantor guaranteed certain
obligations owed by Midwest Express Holdings, Inc. (the "Borrower") to the
Lenders, including, without limitation, all debts, liabilities, obligations,
covenants and agreements of the Borrower in that certain Senior Secured
Revolving Credit Agreement, dated as of August 31, 2001 (the "Credit
Agreement"), by and between the Borrower, the Lenders and U.S. Bank National
Association, d/b/a Firstar Bank, N.A. as Agent for the Lenders, and related
agreements, as amended. Each Guarantor acknowledges the First Amendment to
Senior Secured Revolving Credit Agreement and hereby agrees that it shall remain
liable under its Guaranty for all amounts owed pursuant to the Credit Agreement,
as amended by the Amendment, and the related agreements.

     January 9, 2002.

                                    MIDWEST EXPRESS AIRLINES, INC.

                                    By: /s/ Robert S. Bahlman
                                        ----------------------------------------
                                    Title: CFO
                                           -------------------------------------

                                    ASTRAL AVIATION INC.

                                    By: /s/ Robert S. Bahlman
                                        ----------------------------------------
                                    Title: CFO
                                           -------------------------------------

                                    MIDWEST EXPRESS SERVICES INC. -OMAHA, INC.

                                    By: /s/ Robert S. Bahlman
                                        ----------------------------------------
                                    Title: President
                                           -------------------------------------

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<PAGE>

                                    MIDWEST EXPRESS SERVICES - KANSAS CITY, INC.

                                    By: /s/ Robert S. Bahlman
                                        ----------------------------------------
                                    Title: President
                                           -------------------------------------

                                    YX PROPERTIES, LLC

                                    By: /s/ Robert S. Bahlman
                                        ----------------------------------------
                                    Title: President
                                           -------------------------------------

                                       12
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                                  SCHEDULE 1.1

               ELIGIBLE DC-9 AIRCRAFT and ELIGIBLE OTHER AIRCRAFT

                                    Airplanes
                                    ---------

Manufacturer                  Type/Model              Reg #           Serial #
------------                  ----------              -----           --------
McDonnell Douglas               DC-9-14               N80ME             45795
McDonnell Douglas               DC-9-15               N300ME            45718
McDonnell Douglas               DC-9-14               N500ME            45711
McDonnell Douglas               DC-9-14               N600ME            45725
McDonnell Douglas               DC-9-14               N700ME            45696
McDonnell Douglas               DC-9-14               N800ME            45842
McDonnell Douglas               DC-9-15               N900ME            45841
McDonnell Douglas               DC-9-32               N301ME            47190
McDonnell Douglas               DC-9-32               N302ME            47102
McDonnell Douglas               DC-9-32               N401ME            47133
McDonnell Douglas               DC-9-32               N501ME            47132
McDonnell Douglas               DC-9-32               N502ME            48132
McDonnell Douglas               DC-9-32               N602ME            48133
McDonnell Douglas               MD-8 1                N804ME            48030
McDonnell Douglas               MD-8 1                N806ME            48032
McDonnell Douglas               MD-8 1                N807ME            48033
McDonnell Douglas                MD-82                N809ME            48071
McDonnell Douglas                MD-82                N810ME            48072
McDonnell Douglas                MD-8l                N812ME            48006
McDonnell Douglas                MD-81                N813ME            48007
McDonnell Douglas                MD-81                N814ME            48010

                                     Engines
                                     -------

                                                                       Engine
Manufacturer                     Model                                Serial #
------------                     -----                                --------
Pratt & Whitney                 JT8D-7B                                649315
Pratt & Whitney                 JT8D-7B                                654665
Pratt & Whitney                 JT8D-7B                                649644
Pratt & Whitney                 JT8D-7B                                655098
Pratt & Whitney                 JT8D-7B                                649674
Pratt & Whitney                 JT8D-7B                                654050
Pratt & Whitney                 JT8D-7B                                657573
Pratt & Whitney                 JT8D-7B                                656030
Pratt & Whitney                 JT8D-7B                                656920
Pratt & Whitney                 JT8D-7B                                657106
Pratt & Whitney                 JT8D-7B                                649351
Pratt & Whitney                 JT8D-7B                                654159
Pratt & Whitney                 JT8D-7B                                654071

                                       13
<PAGE>

Pratt & Whitney                 JT8D-7B                                649302
Pratt & Whitney                 JT8D-7B                                657758
Pratt & Whitney                 JT8D-9A                                657218
Pratt & Whitney                 JT8D-9A                                667198
Pratt & Whitney                 JT8D-9A                                665298
Pratt & Whitney                 JT8D-7B                                648927
Pratt & Whitney                 JT8D-7B                                654619
Pratt & Whitney                 JT8D-7B                                654563
Pratt & Whitney                 JT8D-7B                                666283
Pratt & Whitney                 JT8D-9A                                667199
Pratt & Whitney                 JT8D-9A                                707308
Pratt & Whitney                 JT8D-9A                                667173
Pratt & Whitney                 JT8D-9A                                657744
Pratt & Whitney                JT8D-200                                718492
Pratt & Whitney                JT8D-200                                718441
Pratt & Whitney                JT8D-200                                725406
Pratt & Whitney                JT8D-200                                725624
Pratt & Whitney                JT8D-200                                725472
Pratt & Whitney                JT8D-200                                725625
Pratt & Whitney                JT8D-200                                725987
Pratt & Whitney                JT8D-200                                717871
Pratt & Whitney                JT8D-200                                696360
Pratt & Whitney                JT8D-200                                725623
Pratt & Whitney                JT8D-200                                725756
Pratt & Whitney                JT8D-200                                726864
Pratt & Whitney                JT8D-200                                716739
Pratt & Whitney                JT8D-200                                696405
Pratt & Whitney                JT8D-200                                718443
Pratt & Whitney                JT8D-200                                725351
Pratt & Whitney                 JT8D-7B                                653347
Pratt & Whitney                 JT8D-7B                                657395
Pratt & Whitney                 JT8D-7B                                649629
Pratt & Whitney                 JT8D-7B                                665799

                                       14
<PAGE>

                                 EXHIBIT 4.1(1)

                           BORROWING BASE CERTIFICATE

                     Computation Date: ______________, 200_

U.S. Bank National Association,
d/b/a Firstar Bank, N.A.
777 East Wisconsin Avenue
Milwaukee WI  53202

M&I Marshall & Ilsley Bank
770 North Water Street
Milwaukee WI  53202

Bank One, NA
111 East Wisconsin Avenue
Milwaukee WI  53202

Gentlemen:

     This certificate is delivered to you pursuant to the Senior Secured
Revolving Credit Agreement, dated as of August 31, 2001, by and among MIDWEST
EXPRESS HOLDINGS, INC. (the "Borrower"), the several lenders identified on the
signature pages thereto and such other lenders as may from time to time become a
party thereto (each a "Lender" and collectively, the "Lenders"), and U.S. BANK
NATIONAL ASSOCIATION, d/b/a FIRSTAR BANK, N.A., as agent for the Lenders (in
such capacity, the "Agent"). The defined terms in the Credit Agreement are used
herein with the same meanings as specified in the Credit Agreement and all
references to "Sections" are to Sections of the Credit Agreement.

     Borrower hereby represents and warrants to the Lenders that the following
is a true and correct computation of the Borrowing Base as of the Computation
Date:

A.   DC-9 Aircraft

     (1)  Appraisal Value of DC-9 aircraft and
          engines listed on Schedule 1.1 of the
          Credit Agreement                               $_________

     (2)  Less Appraisal Value of aircraft and
          engines not meeting the specifications
          of Eligible DC-9 Aircraft                      $_________

     (3)  Appraisal Value of Eligible DC-9 Aircraft      $_________

     (4)  51% of A(3)                                               $_________

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<PAGE>

B.   Other Aircraft

     (1)  Appraisal Value of aircraft and engines
          listed on Schedule 1.1 of the Credit
          Agreement (other than DC-9 aircraft and
          engines)                                       $_________

     (2)  Less Appraisal Value of aircraft and
          engines not meeting the specifications of
          Eligible Other Aircraft                        $_________

     (3)  Appraisal Value of Eligible Other Aircraft     $_________

     (4)  75% of B(3)                                               $_________

C.   Accounts Receivable

     (1)  Total Accounts Receivable                      $_________

     (2)  Less face amount of accounts not meeting
          specifications of Eligible Accounts
          Receivable                                     $_________

     (3)  Eligible Accounts Receivable                   $_________

     (4)  80% of C(3)                                               $_________

D.   Inventory

     (1)  Total net book value of Inventory              $_________

     (2)  Less net book value of inventory not
          meeting specifications of Eligible
          Inventory                                      $_________

     (3)  Eligible Inventory                             $_________

     (4)  50% of D(3)                                               $_________

E.   Other Equipment

     (1)  Net book value of other equipment              $_________

     (2)  Less net book value of other equipment
          not meeting the specifications of
          Eligible Other Equipment                       $_________

                                       16
<PAGE>

     (3)  Net book value of Eligible Other Equipment     $_________

     (4)  50% of E(3)                                               $_________

F.   Sum of A(4), B(4), C(4), D(4) and E(4)                         $_________

G.   Personal Property Borrowing Base [lesser of
     $45,000,000 and F]                                             $_________

H.   Headquarters Equity

     (1)  Appraised value of headquarters                $_________

     (2)  Less AAL Loan                                  $_________

     (3)  Total headquarters equity                      $_________

     (4)  75% of H(3)                                    $_________

I.   Real Property Borrowing Base (insert $0.00
     until the date when the Borrower shall have
     complied fully with Section 4.3; thereafter
     insert the lessor of $10,000,000 and amount
     set forth in H(4))                                  $_________

J.   Borrowing Base [Sum of G and I]                     $_________

K.   Revolving Loans

     (1)  The outstanding amount of all Revolving
          Loans is                                       $_________

     (2)  The amount, if any, of additional
          Revolving Loans now applied for is             $_________

     (3)  After such additional Revolving Loans are
          made, the  total of all outstanding
          Revolving Loans will be                                   $_________

L.   LOC Obligations

     (1)  The outstanding amount of all LOC
          Obligations is                                 $_________

                                       17
<PAGE>

     (2)  The amount, if any, of additional Letters
          of Credit now applied for is                   $_________

     (3)  After such additional Letters of Credit
          are issued, the total of all outstanding
          LOC Obligations will be                        $_________

M.   Swing Line Loans

     (1)  The outstanding amount of all Swing Line
          Loans is                                       $_________

     (2)  The amount, if any, of additional Swing
          Line Loans now applied for is                  $_________

     (3)  After such additional Swing Line Loans
          are made, the total of all outstanding
          Swing Line Loans will be                                  $_________

N.   Total of K(3) plus L(3) plus M(3)                              $_________

N does not exceed the lesser of J and the Commitment:    _____ Yes     _____ No

The Borrower hereby represents and warrants that, except as previously disclosed
to the Agent in writing pursuant to Section 6.10 of the Credit Agreement:

     (i) no Default or Event of Default has occurred and is continuing;

     (ii) no event of any type described in such Section 6.10 of the Credit
Agreement has occurred since the date of the Credit Agreement; and

     (iii) the representations and warranties of the Borrower contained in the
Credit Agreement are true and correct in all respects on the date hereof as if
made on this date.

                                    MIDWEST EXPRESS HOLDINGS, INC.

                                    By:
                                        ----------------------------------------
                                    Name Printed:
                                                  ------------------------------
                                    Title:
                                           -------------------------------------

                                       18
<PAGE>

                                 EXHIBIT 6.4(h)

                            CASH BALANCES CERTIFICATE

                  Computation Date: ____________________, 200_

U.S. Bank National Association,
d/b/a Firstar Bank, N.A.
777 East Wisconsin Avenue
Milwaukee WI  53202

M&I Marshall & Ilsley Bank
770 North Water Street
Milwaukee WI  53202

Bank One, NA
111 East Wisconsin Avenue
Milwaukee WI  53202

Gentlemen:

     This certificate is delivered to you pursuant to the Senior Secured
Revolving Credit Agreement, dated as of August 31, 2001, by and among MIDWEST
EXPRESS HOLDINGS, INC. (the "Borrower"), the several lenders identified on the
signature pages thereto and such other lenders as may from time to time become a
party thereto (each a "Lender" and collectively, the "Lenders"), and U.S. BANK
NATIONAL ASSOCIATION, d/b/a FIRSTAR BANK, N.A., as agent for the Lenders (in
such capacity, the "Agent"). Capitalized terms used in this certificate shall
have the meanings given to them in the Credit Agreement.

     Borrower hereby represents and warrants to the Lenders that the following
is true and correct as of the Computation Date:

     (1)  Unrestricted cash balances                     $__________

     (2)  Deposits under the Card Processing
          Agreement or a Replacement Card
          Processing Agreement                           $__________

                                       19
<PAGE>

     (3)  Availability                                   $__________

     (4)  Total (Sum of(l), (2) and (3))

                                    MID WEST EXPRESS HOLDINGS, INC.

                                    By:
                                        ----------------------------------------
                                    Name Printed:
                                                  ------------------------------
                                    Title:
                                           -------------------------------------

                                       20EXHIBIT 10.27

                                AMENDMENT NO. 18

                                       TO

                            AIRLINE LEASE NO. AC-865

     THIS AMENDMENT TO CONTRACT OF LEASE is made and entered into as of the 27th
day of July, 2001, by and between MILWAUKEE COUNTY, a municipal corporation,
organized and existing as one of the counties in Wisconsin (hereinafter referred
to as "Lessor" or "County"), and MIDWEST EXPRESS AIRLINES, INC., a corporation
organized and existing under the laws of the State of Wisconsin (hereinafter
referred to as "Lessee" or "Airline").

                              W I T N E S S E T H :

     THAT, WHEREAS, the parties hereto have heretofore entered into an Airline
Lease dated April 5, 1985, as amended, relating to space, occupancy and the use
of the premises and facilities of General Mitchell International Airport (GMIA)
for the transportation of persons and cargo by air; and

     WHEREAS, Airline requests that Lessor assign portions of unassigned
terminal building areas to Airline for Airline to construct additional Gate Hold
Room, Ticket Counter Office, and Concourse Lower Level Office Finished space;
and,

     WHEREAS, on June 22, 2000, (File No. 00-375) County's Board of Supervisors
approved amending Airline's Lease to add additional Gate Hold Room, Ticket
Counter Office, and Concourse Lower Level Office Finished space;

     NOW, THEREFORE, for and in consideration of the premises and of the mutual
covenants and agreements herein contained and other valuable considerations, it
is mutually agreed between the parties hereto that the aforesaid agreement dated
April 5, 1985, as amended, be and is hereby further amended in the following
particulars, to wit:

     1. Effective on April 1, 2000, paragraph S of Article IV shall be deleted
in its entirety and a new paragraph S inserted therefore, reading as follows:

     "S.  LESSEE'S EXCLUSIVE USE SPACE WITHIN THE TERMINAL BUILDING ON APRIL 1,
          2000

          For purposes of calculation of Lessee's Terminal rents for those areas
          designated for Lessee's exclusive use in the Terminal Building, the
          following space definitions, relative cost factors, and resultant ERUs
          shall be utilized:

<PAGE>

                                                         Relative
Space Function                              Sq. Ft.     Cost Factor      ERUs
--------------                             ---------    -----------    ---------

Concourse Lower Level Office Unfinished          -0-         .20             -0-
(Unheated)

Concourse Lower Level Office Unfinished
(Heated)                                    4,588.50         .70        3,211.95

Concourse Lower Level Office Finished
(Heated & Air Conditioned)                 30,695.90         .85       26,091.52

Concourse Upper Level Office Unfinished          -0-         .95             -0-

Concourse Upper Level Office Finished       5,793.00         .95        5,503.35

Ticket Counter                              1,257.20        1.10        1,382.92

Ticket Counter Office                       1,901.60         .95        1,806.52

Gate Hold Rooms                            19,692.00        1.00       19,692.00

Baggage Makeup Area                         5,619.10         .75        4,214.33

Baggage Service Office                        405.00        1.00          405.00

Hold Room Stairwell                         1,796.44         .15          269.47

Basement                                         -0-         .25             -0-

Mezzanine Office Areas                           -0-         .90             -0-

Operations Control Tower                      401.00        1.08          433.08
                                           ---------                   ---------

TOTALS                                     72,149.74                   63,010.14

          The spaces outlined above are those occupied by Lessee on April 1,
          2000, to which 235 square feet of Concourse Lower Level Office
          Finished space is added as shown on Exhibit "P", page 16 of 16, Rev.
          4/00, attached hereto and made a part hereof."

     2. Effective on July 1, 2000, paragraph S of Article IV shall be deleted in
its entirety and a new paragraph S inserted therefore, reading as follows:

                                       2
<PAGE>

     "S.  LESSEE'S EXCLUSIVE USE SPACE WITHIN THE TERMINAL BUILDING ON JULY 1,
          2000

          For purposes of calculation of Lessee's Terminal rents for those areas
          designated for Lessee's exclusive use in the Terminal Building, the
          following space definitions, relative cost factors, and resultant ERUs
          shall be utilized:

                                                         Relative
Space Function                              Sq. Ft.     Cost Factor      ERUs
--------------                             ---------    -----------    ---------

Concourse Lower Level Office
Unfinished (Unheated)                            -0-         .20             -0-

Concourse Lower Level Office
Unfinished (Heated)                         4,588.50         .70        3,211.95

Concourse Lower Level Office
Finished (Heated & Air Conditioned)        30,795.90         .85       26,176.52

Concourse Upper Level Office
Unfinished                                       -0-         .95             -0-

Concourse Upper Level Office
Finished                                    5,793.00         .95        5,503.35

Ticket Counter                              1,257.20        1.10        1,382.92

Ticket Counter Office                       2,076.60         .95        1,972.77

Gate Hold Rooms                            20,052.00        1.00       20,052.00

Baggage Makeup Area                         5,619.10         .75        4,214.33

Baggage Service Office                        405.00        1.00          405.00

Hold Room Stairwell                         1,796.44         .15          269.47

Basement                                         -0-         .25             -0-

Mezzanine Office Areas                           -0-         .90             -0-

Operations Control Tower                      401.00        1.08          433.08
                                           ---------                   ---------

TOTALS                                     72,784.74                   63,621.39

          The spaces outlined above are those occupied by Lessee on July 1,
          2000, to which 100 square feet of Concourse Lower Level Office
          Finished space is added, as

                                       3
<PAGE>

          shown on Exhibit "P", page 16 of 16, Rev. 7/00, 175 square feet of
          Ticket Counter Office space (used as an employee coat room), as shown
          on Exhibit "P", page 1 of 16, Rev. 7/00, and 360 square feet of Gate
          Hold Room space, as shown on Exhibit "P", page 8 of 16, Rev. 7/00, all
          of which are attached hereto and made a part hereof."

     3. Except as specifically provided herein; the terms and conditions of the
Lease heretofore entered into between the parties dated April 5, 1985, as
amended, shall remain in full force and effect.

     IN WITNESS WHEREOF, the parties hereto have caused these presents to be
signed by their respective proper officers and their corporate seals hereto
affixed on the dates hereinafter set forth.

                                     COUNTY

     Dated at Milwaukee, Wisconsin, this 27th day of July, 2001.

APPROVED:                                       MILWAUKEE COUNTY
                                                a municipal corporation

/s/  Airport Director         July 11, 2001     By: /s/  David A. Novak
-------------------------------------------        -----------------------------
Airport Director                       Date           David A. Novak
                                                      Director of Public Works

/s/  Corporation Counsel      July 17, 2001     By: /s/  Mark Ryan
-------------------------------------------        -----------------------------
Corporation Counsel                    Date          Mark Ryan
                                                     County Clerk

                                       4
<PAGE>

                                     AIRLINE

     Dated at Milwaukee, WI, this 28th day of June, 2001.

                                           MIDWEST EXPRESS AIRLINES, INC.
                                           a Wisconsin corporation

                                           By:    /s/ Robert S. Bahlman
                                                 -------------------------------
                                                  Robert S. Bahlman

                                           Title: Sr. Vice President
                                                 -------------------------------

                                           Date:  June 28, 2001
                                                 -------------------------------

                                           By:
                                                 -------------------------------

                                           Title:
                                                 -------------------------------

                                           Date:
                                                 -------------------------------

STATE OF WISCONSIN )
                   )  ss
MILWAUKEE COUNTY   )

     Personally came before me this 27th day of July, 2001, the above named
David A. Novak, Director of Public Works for Milwaukee County, to me known to be
the person who executed the foregoing instrument on behalf of Milwaukee County,
and acknowledged the same to be the free act and deed of said County, made by
its authority.

                                           /s/  Carolyn Pucci-Schiel
                                           -------------------------------------
                                           Notary Public, Milwaukee Co., Wis.
                                           My commission expires:  2-03-02

                                       5
<PAGE>

STATE OF WISCONSIN )
                   )  ss
MILWAUKEE COUNTY   )

     Personally came before me this 27th day of July, 2001, the above named Mark
Ryan, County Clerk of Milwaukee County, to me known to be the person who
executed the foregoing instrument on behalf of Milwaukee County, and
acknowledged the same to be the free act and deed of said County, made by its
authority.

                                          /s/  Lori Mueller
                                          -------------------------------------
                                          Notary Public, Milwaukee Co., Wis.
                                          My commission expires:  10-19-03

STATE OF WISCONSIN  )
                    )  ss
COUNTY OF MILWAUKEE )

     Personally came before me this 28th day of June, 2001, Robert S. Bahlman,
Sr. Vice President, and ______________, ________________, of MIDWEST EXPRESS
AIRLINES, INC., Lessee above, to me known to be the persons who executed the
foregoing instrument and to me known to be such officers of said corporation,
and acknowledged that they executed the foregoing instrument as such officers as
the deed of said corporation, by its authority.

                                          /s/  Linda C. Snyder
                                          --------------------------------------
                                          Notary Public, Linda C. Snyder
                                                         -----------------------
                                          My commission expires: January 2, 2005
                                                                ---------------

                                       6

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