Document:

<Page>

                                                                EXHIBIT 10.12(c)

                                                          CONFIDENTIAL TREATMENT
                                                  REQUESTED PURSUANT TO RULE 406

        CERTAIN PORTIONS OF THIS EXHIBIT HAVE BEEN OMITTED PURSUANT TO A
            REQUEST FOR CONFIDENTIAL TREATMENT UNDER RULE 406 OF THE
             SECURITIES ACT OF 1933. THE OMITTED MATERIALS HAVE BEEN
                FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
                                   COMMISSION.

                                  CONFIDENTIAL

                        AMENDMENT NUMBER 2 TO AMENDED AND
                     RESTATED PURCHASE AGREEMENT GCT-025/98

This Amendment Number 2 to Amended and Restated Purchase Agreement GCT-025/98,
dated as of July 25, 2002 ("Amendment No.2") relates to the Amended and Restated
Purchase Agreement GCT-025/98 (the "Purchase Agreement") between Embraer -
Empresa Brasileira de Aeronautica S.A. ("Embraer") and Republic Airways
Holdings, Inc. ("Buyer") dated April 19, 2002 as amended from time to time
(collectively referred to herein as "Agreement"). This Amendment No.2 is between
Embraer and Buyer, collectively referred to herein as the "Parties".

This Amendment No. 2 sets forth additional agreements between Embraer and Buyer
relative to changes in the Delta Aircraft and Other Option EMB-145 Aircraft
configuration as described in Attachment "A-1", "A-2", "A-3" and "A-4", Delta
Aircraft and Other Option EMB-145 Aircraft Basic Price and delivery schedule.

Except as otherwise provided for herein all terms of the Purchase Agreement
shall remain in full force and effect. All capitalized terms used in this
Amendment No.2, which are not defined herein shall have the meaning given in the
Purchase Agreement. In the event of any conflict between this Amendment No.2 and
the Purchase Agreement the terms, conditions and provisions of this Amendment
No.2 shall control.

WHEREAS, in connection with the Parties' agreements with respect to the aircraft
configuration changes, prices and schedule delivery changes, the Parties have
now agreed to amend the Purchase Agreement as provided for below.

NOW, THEREFORE, for good and valuable consideration which is hereby acknowledged
Embraer and Buyer hereby agree as follows:

1.  DELTA AIRCRAFT CONFIGURATION CHANGES

    The following configuration changes are applicable only for the Delta
    Aircraft and shall be applicable to Attachment "A-3" and "A-4" to the
    Purchase Agreement.

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Amendment No. 2 to Amended and Restated Purchase Agreement GCT-025/98
                                                                     Page 1 of 6

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    1.1 STANDARD PASSENGER DOOR (AIRSTAIR TYPE DOOR)

    Each of the newly manufactured Delta Aircraft shall be configured with the
    Standard Passenger Door (airstair type door) instead of the [*]. As a result
    of this modification, the Delta Aircraft manufacturer empty weight (MEW)
    shall be [*], which shall be considered in all performance and weight
    guarantees contemplated in the Purchase Agreement, and the Delta Aircraft
    Basic Price shall be [*].

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Amendment No. 2 to Amended and Restated Purchase Agreement GCT-025/98

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                                                                     Page 2 of 6

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    1.2 NEW GENERATION COCKPIT PANEL

    Each of the newly manufactured Delta Aircraft shall be configured with the
    New Generation Cockpit Panel. There will [*] the Delta Aircraft manufacturer
    empty weight (MEW) as a result of this modification [*] the Delta Aircraft
    Basic Price.

    1.3 PROVISIONS FOR 2ND FMS AND CMU

    Each of the newly manufactured Delta Aircraft shall be configured with the
    provisions for 2nd FMS and CMU [*] are not included. As a result of this
    modification, the Delta Aircraft manufacturer empty weight (MEW) shall be
    [*], which shall be considered in all performance and weight guarantees
    contemplated in the Purchase Agreement, and the Delta Aircraft Basic Price
    shall be [*].

2.2.   DELTA AIRCRAFT AND OTHER OPTION EMB-145 AIRCRAFT CONFIGURATION CHANGES

    The following configuration changes are applicable for the Delta Aircraft
    and for the Other Option EMB-145 Aircraft and shall be applicable to
    Attachment "A-1", "A-2", "A-3" and "A-4" to the Purchase Agreement.

    2.1 NEW WINDSHIELD TEMPERATURE CONTROLLER AND PPG WINDSHIELD

    Each of the newly manufactured Delta Aircraft and Other Option EMB-145
    Aircraft shall be configured with the new windshield temperature controller
    and PPG windshield instead of [*]. As a result of this modification, the
    Delta Aircraft and the Other Option EMB-145 Aircraft manufacturer empty
    weight (MEW) shall be [*], which shall be considered in all performance
    and weight guarantees contemplated in the Purchase Agreement, and [*] the
    Delta Aircraft and the Other Option EMB-145 Aircraft Basic Price.

    2.2 FDR 88 PARAMETERS

    Each of the newly manufactured Delta Aircraft and Other Option EMB-145
    Aircraft shall be configured with the FDR capable of recording 88
    parameters [*]:

      [*]
      [*]
      [*]
      [*]
      [*]
      [*]
      [*]
      [*]
      [*]
      [*]
      [*]
      [*]
      [*]

    As a result of this modification, the Delta Aircraft and Other Option
    EMB-145 Aircraft manufacturer empty weight (MEW) shall be [*], which shall
    be considered in all performance and weight guarantees contemplated in
    the Purchase Agreement. The Delta Aircraft Basic Price shall be [*] in [*]
    economic conditions, and the Other Option EMB-145 Aircraft Basic price shall
    be [*].

3.3.   PRICE:

    A. Article 3.a.1 shall be deleted and replaced with the following:

    1.1  The EMB-145 Delta Aircraft Basic Price of [*], for each EMB-145 Delta
         Aircraft.

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Amendment No. 2 to Amended and Restated Purchase Agreement GCT-025/98

                                                                     Page 3 of 6

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    1.2  The EMB-135 Delta Aircraft Basic Price of [*], for each EMB-135 Delta
         Aircraft.

    1.3  The Other Option EMB-145 Aircraft Basic Price of [*], for each Other
         Option EMB-145 Aircraft.

4.4.   DELIVERY SCHEDULE: Article 5.a of the Purchase Agreement shall be deleted
       and replace with the following:

    AIRCRAFT: Subject to payment in accordance with Article 4 and the provisions
    of Articles 4, 7 and 9, the Aircraft shall be offered for delivery by
    Embraer to Buyer, by means of a notice, for inspection, acceptance and
    subsequent delivery in F.A.F. (Fly Away Factory) condition, at Sao Jose dos
    Campos, State of Sao Paulo, Brazil.

<Table>
<Caption>
                                       FIRM AIRCRAFT
-----------------------------------------------------------------------------------
  A/C DELIVERY    AIRCRAFT DELIVERY     AIRCRAFT DELIVERY        DELIVERY MONTH
     NUMBER       NUMBER PER MODEL     NUMBER PER OPERATOR
-----------------------------------------------------------------------------------
<S>               <C>                  <C>                       <C>
      [*]                [*]                   [*]                October 2002
-----------------------------------------------------------------------------------
      [*]                [*]                   [*]                     [*]
-----------------------------------------------------------------------------------
      [*]                [*]                   [*]                     [*]
-----------------------------------------------------------------------------------
      [*]                [*]                   [*]                     [*]
-----------------------------------------------------------------------------------
      [*]                [*]                   [*]                     [*]
-----------------------------------------------------------------------------------
      [*]                [*]                   [*]                     [*]
-----------------------------------------------------------------------------------
      [*]                [*]                   [*]                     [*]
-----------------------------------------------------------------------------------
      [*]                [*]                   [*]                     [*]
-----------------------------------------------------------------------------------
      [*]                [*]                   [*]                     [*]
-----------------------------------------------------------------------------------
      [*]                [*]                   [*]                     [*]
-----------------------------------------------------------------------------------
      [*]                [*]                   [*]                     [*]
-----------------------------------------------------------------------------------
      [*]                [*]                   [*]                     [*]
-----------------------------------------------------------------------------------
      [*]                [*]                   [*]                     [*]
-----------------------------------------------------------------------------------
      [*]                [*]                   [*]                     [*]
-----------------------------------------------------------------------------------
      [*]                [*]                   [*]                     [*]
-----------------------------------------------------------------------------------
      [*]                [*]                   [*]                     [*]
-----------------------------------------------------------------------------------
      [*]                [*]                   [*]                     [*]
-----------------------------------------------------------------------------------
      [*]                [*]                   [*]                     [*]
-----------------------------------------------------------------------------------
      [*]                [*]                   [*]                     [*]
-----------------------------------------------------------------------------------
      [*]                [*]                   [*]                     [*]
-----------------------------------------------------------------------------------
      [*]                [*]                   [*]                     [*]
-----------------------------------------------------------------------------------
      [*]                [*]                   [*]               September 2003
-----------------------------------------------------------------------------------
</Table>

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Amendment No. 2 to Amended and Restated Purchase Agreement GCT-025/98

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*Confidential
                                                                     Page 4 of 6
<Page>

5.  MISCELLANEOUS: All other provisions of the Agreement which have not been
    specifically amended or modified by this Amendment No.2 shall remain valid
    in full force and effect without any change.

                          [Intentionally left in blank]

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Amendment No. 2 to Amended and Restated Purchase Agreement GCT-025/98
                                                                     Page 5 of 6

<Page>

IN WITNESS WHEREOF, EMBRAER and BUYER, by their duly authorized officers, have
entered into and executed this Amendment No.2 to Amended and Restated Purchase
Agreement to be effective as of the date first written above.

EMBRAER - Empresa Brasileira de           Republic Airways Holdings, Inc.
Aeronautica S.A.

By      /s/ Frederico Fleury Curado       By     /s/ Robert H. Cooper
Name:   Frederico Fleury Curado           Name:  Robert H. Cooper
Title:  Executive Vice President -        Title: EVP & CFO
Airline Market

By      /s/ Flavio Rimoli                 Date:  September 23, 2002
Name:   Flavio Rimoli                     Place: Indianapolis, IN
Title:  Director of Contracts

Date:   August 8, 2002
Place:  Sao Jose dos Campos, SP,
Brazil

Witness: /s/ Juliette O. Zambelli         Witness: /s/ Lars-Erik Aruell

Name: Juliette O. Zambelli                Name: Lars-Erik Aruell

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Amendment No. 2 to Amended and Restated Purchase Agreement GCT-025/98
                                                                     Page 6 of 6<Page>

                                                                EXHIBIT 10.13(b)

                                                          CONFIDENTIAL TREATMENT
                                                  REQUESTED PURSUANT TO RULE 406

        CERTAIN PORTIONS OF THIS EXHIBIT HAVE BEEN OMITTED PURSUANT TO A
            REQUEST FOR CONFIDENTIAL TREATMENT UNDER RULE 406 OF THE
             SECURITIES ACT OF 1933. THE OMITTED MATERIALS HAVE BEEN
          FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION.

                                  CONFIDENTIAL

                          AMENDMENT NUMBER 2 TO AMENDED
                    AND RESTATED LETTER AGREEMENT GCT-026/98

This Amendment Number 2 to Amended and Restated Letter Agreement GCT-026/98,
dated as of July 25, 2002 ("Amendment No.2") relates to the Amended and Restated
Letter Agreement GCT-026/98 (the "Letter Agreement") between Embraer - Empresa
Brasileira de Aeronautica S.A. ("Embraer") and Republic Airways Holdings, Inc.
("Buyer") dated April 19, 2002, which concerns the Amended and Restated Purchase
Agreement GCT-025/98 (the "Purchase Agreement"), as amended from time to time
(collectively referred to herein as the "Agreement"). This Amendment No.2 is
between Embraer and Buyer, collectively referred to herein as the "Parties".

This Amendment No. 2 sets forth further agreements between Embraer and Buyer
relative to change in the configuration of the EMB-140 Aircraft described in
Schedule "6" and change in EMB-140 Aircraft Basic Price.

This Amendment No. 2 constitutes an amendment and modification of the Letter
Agreement. All terms defined in the Agreement and not defined herein shall have
the meaning given in the Agreement when used herein, and in case of any conflict
between this Amendment No. 2 and the Agreement, the terms of this Amendment
No. 2 shall control.

WHEREAS, in connection with the Parties' agreements as described above, the
Parties have agreed to modify the Letter Agreement as provided below;

NOW, THEREFORE, for good and valuable consideration, receipt of which is hereby
acknowledged, Embraer and Buyer do hereby agree as follows:

1.  EMB-140 AIRCRAFT CONFIGURATION CHANGES

    The following configuration changes are applicable for the EMB-140 Aircraft
    and shall be applicable to Schedule "6" to the Letter Agreement.

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Amendment No. 2 to Amended and Restated Purchase Agreement GCT-025/98
                                                                     Page 1 of 3

<Page>

    1.1 NEW WINDSHIELD TEMPERATURE CONTROLLER AND PPG WINDSHIELD

    Each of the newly manufactured EMB-140 Aircraft shall be configured with the
    new windshield temperature controller and PPG windshield instead of the [*].
    As a result of this modification, the EMB-140 Aircraft manufacturer empty
    weight (MEW) shall be [*], which shall be considered in all performance and
    weight guarantees contemplated in the Purchase Agreement, and [*] the
    EMB-140 Aircraft Basic Price.

    1.2 FDR 88 PARAMETERS

            Each of the newly manufactured EMB-140 Aircraft shall be configured
    with the FDR capable of recording 88 parameters [*]
             [*]
             [*]
             [*]
             [*]
             [*]
             [*]
             [*]
             [*]
             [*]
             [*]
             [*]
             [*]

    As a result of this modification, the EMB-140 Aircraft manufacturer empty
    weight (MEW) shall be [*], which shall be considered in all performance
    and weight guarantee contemplated in the Purchase Agreement. The EMB-140
    Aircraft Basic price shall be [*].

2.  EMB-140 AIRCRAFT BASIC PRICE:

    Article 8.B.1 of the Letter Agreement shall be deleted and replaced with the
    following:

    B.1.  The unit Basic Price of the EMB-140 Aircraft shall be [*] in the
          configuration, specification and installations specified in Schedule
          "6", provided that there will be no [*] as described in Section 4.c of
          this Agreement and any other [*] agreed to in writing between Embraer
          and Buyer. In the event Buyer enters into a [*] for any EMB-140
          Aircraft, the EMB-140 Aircraft Basic Price shall be [*].

3.  MISCELLANEOUS:  All other provisions of the Agreement, which have not been
specifically amended or modified by this Amendment No.2, shall remain valid in
full force and effect without any change.

                          [Intentionally left in blank]

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Amendment No. 2 to Amended and Restated Purchase Agreement GCT-025/98

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<Page>

IN WITNESS WHEREOF, Embraer and Buyer, by their duly authorized officers, have
entered into and executed this Amendment No.2 to be effective as of the date
first written above.

EMBRAER - Empresa Brasileira de           Republic Airways Holdings, Inc.
Aeronautica S.A.

By      /s/ Frederico Fleury Curado       By     /s/ Bryan Bedford
Name:   Frederico Fleury Curado           Name:  Bryan Bedford
Title:  Executive Vice President -        Title: President
Airline Market

By      /s/ Flavio Rimoli                 Date:  October 4, 2002
Name:   Flavio Rimoli                     Place: Indianapolis, USA
Title:  Director of Contracts

Date:
Place:

Witness: /s/ Fernando Bueno               Witness: /s/ Robert H. Cooper

Name: Fernando Bueno                      Name: Robert H. Cooper

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Amendment No. 2 to Amended and Restated Purchase Agreement GCT-025/98
                                                                     Page 3 of 3

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