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                                                               Exhibit 10.33(a)

                                 FIRST AMENDMENT
                                       TO
                             OFFICE LEASE AGREEMENT
                                      WITH
                            CHAUTAUQUA AIRLINES, INC.

     THIS FIRST AMENDMENT, made and entered into this 17th day of July, 1998, by
and between the Indianapolis Airport Authority, (hereinafter called
"AUTHORITY"), and Chautauqua Airlines, Inc., a New York corporation, authorized
to do business in the State of Indiana, (hereinafter called "LESSEE").

                                   WITNESSETH:

     WHEREAS, AUTHORITY and LESSEE have previously entered into a Lease
Agreement dated June 17, 1994, for certain administrative office space located
on the third floor of the Administration Building at Indianapolis International
Airport; and,

     WHEREAS, the term of said Lease Agreement, expires on June 30, 2000; and

     WHEREAS, AUTHORITY and LESSEE have also previously entered into a Letter of
Agreement dated February 8, 1995 for office space located on the third floor of
the Administration Building commonly known as rooms H305, H305A, H305B, and
H305C; and

     WHEREAS, said Letter of Agreement shall terminate upon the execution of
this First Amendment; and

     WHEREAS, LESSEE desires to rent additional office space on the third floor
of the Administration Building commonly known as rooms H306 and H306A, and other
space on the fourth floor commonly known as rooms H401, H415, H415E, H415F,
H415G, H416, H416B, H416C, H416D, H417; and

     WHEREAS, Authority finds it necessary to revise the additional insureds;

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     NOW, THEREFORE, in consideration of the foregoing and the mutual covenants
contained herein, the parties hereby agree that the Letter of Agreement dated
February 8, 1995 is terminated and that Section 1. LEASED PREMISES, Section 2.,
TERM, Section 3., RENTAL, Paragraph A, LEASED PREMISES, and Section 8.,
INDEMNITY of the basic Lease Agreement are hereby deleted and the following is
substituted:

     1.   LEASED PREMISES

          The term "Leased Premises" as used in this Amendment shall consist of
          9,749.1 square feet of space located on the third floor of the
          Administration Building and 2,763.65 square feet of space located on
          the fourth floor of the Administration Building at Indianapolis
          International Airport and more particularly shown on Exhibit "A" dated
          July 15, 1998, attached hereto.

     2.   TERM

          LESSEE shall have a different lease term for each floor it shall
          occupy. The term for the Third Floor Leased Premises shall commence on
          August 1, 1998 and shall expire July 31, 2001. The term for the Fourth
          Floor Leased Premises shall commence on August 1, 1998 and shall
          expire on July 31, 2000.

     3.   RENTAL

          A.   LEASED PREMISES

               As rental for the use of said Leased Premises and appurtenances
               thereto, LESSEE agrees to pay per annum in accordance with the
               following rental schedule, payable in advance in twelve (12)
               equal payments on the first day of each calendar month effective
               August 1, 1998.

                                        2
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          B.   RENTAL SCHEDULE

               THIRD FLOOR

               8/1/98 THROUGH 7/31/01 - 9,749.1 sq. ft. x $10.50 p.s.f. =
               $102,365.55 per year, payable at $8,530.46 per month.

               FOURTH FLOOR

               8/1/98 THROUGH 7/311/00 - 2,763.65 sq. ft. x $10.50 p.s.f. =
               $ 29,018.33 per year, payable at $2,418.19 per month.

                    LESSEE shall have the right to terminate the Lease Agreement
               on the fourth floor space with ninety (90) days written notice
               prior to end of original term.

                    Any partial month of rent shall be prorated. Said rent shall
               be payable at the office of the AUTHORITY or such other place as
               AUTHORITY may from time to time designate.

     8.   INDEMNITY

          LESSEE agrees to indemnify fully, and save and hold AUTHORITY harmless
          from and against all claims and actions and all expenses incidental to
          the investigation and defense thereof, based on or arising out of
          damages or injuries to third persons or their property, caused by the
          fault or negligence of LESSEE, provided, however, that LESSEE shall
          not be liable for any injury or damage or loss occasioned by the
          negligence of AUTHORITY, its agents or employees, and provided further
          that AUTHORITY shall give LESSEE prompt and reasonable notice of any
          such claims or actions, and LESSEE shall have the right to
          investigate, compromise and defend the same. LESSEE agrees to carry
          out and keep in force, with a company suitable to AUTHORITY, public
          liability insurance covering bodily injury and property damage and
          such other insurance as

                                        3
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          may he necessary to protect AUTHORITY herein from such claims and
          actions aforesaid. Without limiting its liability as foresaid, LESSEE
          agrees to carry and keep in force such insurance with single limit of
          liability for bodily injury and property damage in a sum not less than
          $5,000,000.00 for any one accident and to furnish AUTHORITY with
          proper certificate that such insurance is in force designating the
          Indianapolis Airport Authority, BAA Indianapolis LLC, and BAA USA
          Holdings, Inc. as additional insureds.

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     THIS FIRST AMENDMENT shall be effective July 15, 1998 and all other terms
of the basic Lease dated June 17, 1994, shall remain the same.

     IN WITNESS WHEREOF, the parties hereto have caused this instrument to be
executed as of the date first above mentioned.

                                          INDIANAPOLIS AIRPORT AUTHORITY

                                       By /s/ Michael W. Wells
                                          --------------------------------------
                                          Michael W. Wells, President

                                       By /s/ Gordan St. Angelo
                                          --------------------------------------
                                          Gordan St. Angelo, Vice President

                                       By /s/ Gene P. Haflich
                                          --------------------------------------
                                          Gene P. Haflich, Secretary

                                       By [SEAL OF ABSENT]
                                          --------------------------------------
                                          Max. L. Siegel, Member

                                       By /s/ Richard L. Cunningham
                                          --------------------------------------
                                          Richard L. Cunningham, Member

                                       By [SEAL OF ABSENT]
                                          --------------------------------------
                                          Michael B. Stayton, Member

                                       By /s/ David B. Mansfield
                                          --------------------------------------
                                          David B. Mansfield, Member

                                                    AUTHORITY

CHAUTAUQUA AIRLINES, INC.

By /s/ [ILLEGIBLE]
   -----------------------------
Title  Executive V.P. & COO
       -------------------------
             LESSEE

                                        5<Page>

                                                               Exhibit 10.33(b)

                                SECOND AMENDMENT
                                       TO
                             OFFICE LEASE AGREEMENT
                                      WITH
                            CHAUTAUQUA AIRLINES, INC.

     THIS SECOND AMENDMENT, made and entered into this 2 day of October 1998, by
and between the Indianapolis Airport Authority, (hereinafter referred to as
"AUTHORITY"), and Chautauqua Airlines, Inc., a New York corporation, authorized
to do business in the State of Indiana, (hereinafter referred to as "LESSEE").

                              W I T N E S S E T H:

     WHEREAS, LESSEE desires to rent additional office space on the fourth floor
of the Administration Building commonly known as Room 415A and Room 415C; and

     WHEREAS, LESSEE desires to have an option to extend their lease;

     NOW, THEREFORE, in consideration of the foregoing and the mutual covenants
contained herein, the parties hereby agree that Article 1., LEASED PREMISES.
Article 2., TERM, Article 3., RENTAL, LEASED PREMISES and Article 3 RENTAL
RENTAL SCHEDULE are hereby deleted and the following are substituted:

     1. LEASED PREMISES

        The term "Leased Premises" shall consist of 9,749.1 square feet on the
        third floor of the Administration Building including the mens and womens
        restrooms, although no rental is being charged for this square footage
        and excepting the telephone equipment, mechanical, electrical and
        janitorial rooms, corridor and lobby and 3.899.65 square feet on the
        fourth floor of the Administration Building of which all of the rental
        space is more particularly shown on Exhibit "A" dated September 15,
        1998, attached hereto.

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     2. TERM

        LESSEE shall have a different term for each floor it shall occupy. The
        term for the third floor Leased Premises commenced on August 1, 1998 and
        shall expire July 31, 2001. The term for the fourth floor Leased
        Premises, except for Rooms 415A and 415C, commenced on August 1, 1998
        and shall expire on July 31, 2000. The commencement date for Rooms 415A
        and 415C shall begin on day of occupancy via letter of agreement and
        shall expire on July 31, 2000.

            LESSEE shall have an option to extend this Lease for an additional
        term of three (3) years upon the rental terms outlined in Article 3. B.
        LESSEE shall have a different term for each floor it shall occupy. The
        option term for the third floor shall commence August 1, 2001 and shall
        terminate on July 31, 2004. The option term for the fourth floor shall
        commence on August 1, 2000 and shall expire on July 31, 2003.

            LESSEE may exercise the option by mailing or delivering to AUTHORITY
        written notice of such intention not later than six (6) months prior to
        the date of expiration of the primary terms and the first option terms.
        Notification date on the third floor shall be on or before February 1,
        2001. Notification date on the fourth floor shall be on or before
        February 1, 2000.

     3. RENTAL

        A.  LEASED PREMISES

            Rental for the use of said Leased Premises and appurtenances
            thereto, LESSEE agrees to pay per annum in accordance with the
            following rental schedules payable in advance in twelve (12) equal
            payments on the first day of each calendar month affective on the
            first day of occupancy.

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            RENTAL SCHEDULE - PRIMARY TERM

            THIRD FLOOR

            AUGUST 1, 1998 THROUGH JULY 31, 2001
            9,749.1 square feet X $10.50 p.s.f. = $102,365.55 per year payable
            at $8,530.46 per month.

            FOURTH FLOOR

            AUGUST 1, 1998 THROUGH OCCUPANCY OF ROOMS 415A AND 415C
            2,763.65 square feet X $10.50 p.s.f. = $29,018.33 payable at
            $2,418.19 per month

            OCCUPANCY OF 415A AND 415C THROUGH JULY 31, 2000

            3,899.65 X $10.50 p.s.f = $40,946.33 per year payable at $3,412.19
            per month

                 Rental for Rooms 415A and 415C shall begin on date of
            occupancy via letter of agreement.

                 Any partial month of rent shall be prorated. Said rent shall be
            payable at the office of the AUTHORITY or such other place as

            AUTHORITY may from time to time designate.

            B. RENTAL SCHEDULE - OPTION PERIODS.

            THIRD FLOOR

            August 1, 2001 - July 31, 2002

            9,749.1 square feet X $11.00 per square feet = $107,240.00 per year
                                                           $  8,936.69 per month
            August 1, 2002 Through July 31, 2003
            9,749.1 square feet X $11.50 per square feet = $112,114.65 per year
                                                           $  9,342.89 per month

            August 1, 2003 Through July 31, 2004
            9,749.1 square feet X $12.00 per square feet = $116,989.20 per year
                                                           $  9,749.10 per month

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            FOURTH FLOOR

            August 1, 2000 through July 31, 2001
            3,899.65 square feet X $11.00 per square feet = $42,896.15 per year
                                                            $ 3,574.68 per month
            August 1, 2001 through July 31, 2002
            3,899.65 square feet X $11.50 per square feet = $44,845.98 per year
                                                            $ 3,737.16 per month
            August 1, 2002 through July 31, 2003
            3,899.65 square feet X  12.00 per square feet = $46,795.80 per year
                                                            $ 3,899.65 per month

                                       4
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     THIS SECOND AMENDMENT shall be effective this 2 day of October, 1998 and
all other terms of the basic Lease dated June 17, 1994, shall remain the same.

     IN WITNESS WHEREOF, the parties  have caused this instrument to be
executed as of the date first above mentioned.

                                          INDIANAPOLIS AIRPORT AUTHORITY

                                         By /s/ Michael W. Wells
                                            ------------------------------------
                                            Michael W. Wells, President

                                         By /s/ Gordon St. Angelo
                                            ------------------------------------
                                            Gordon St. Angelo, Vice President

                                         By /s/ Gene P. Haflich
                                            ------------------------------------
                                            Gene P. Haflich, Secretary

                                         By [SEAL OF ABSENT]
                                            ------------------------------------
                                            Max L. Siegel, Member

                                         By /s/ Richard L. Cunningham
                                            ------------------------------------
                                            Richard L. Cunningham, Member

                                         By /s/ Michael B. Stayton
                                            ------------------------------------
                                            Michael B. Stayton, Member

                                         By /s/ David B. Mansfield
                                            ------------------------------------
                                            David B. Mansfield, Member

                                                     AUTHORITY

CHAUTAUQUA AIRLINES, INC.

By /s/ [ILLEGIBLE]
   ----------------------------------

Title Executive V.P. & COO
      -------------------------------

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