Document:

<Page>

                                                                Exhibit 10.13(a)

                        PARTIAL ASSIGNMENT AND ASSUMPTION
                        OF PURCHASE AGREEMENT GCT-025/98

This Partial Assignment and Assumption of Purchase Agreement GCT-025/98
("Agreement") dated April 7, 2002, is an agreement between SOLITAIR CORP.
("Assignor") a Delaware corporation with its principal place of business at
Greenwich, Connecticut and Republic Airways Holdings, Inc. ("Assignee"), a
Delaware corporation with its principal place of business at Indianapolis,
Indiana 46241, United States, and consented to by Embraer - Empresa Brasileira
de Aeronautica S.A. ("Embraer"), with its principal place of business at Sao
Jose dos Campos, Sao Paulo, Brazil, relating to Purchase Agreement GCT-025/98
(as amended prior to the date hereof, the "Purchase Agreement").

This Agreement constitutes an amendment and modification of the Purchase
Agreement, and it sets forth additional agreements of the Parties with respect
to the matters set forth in the Purchase Agreement. All terms defined in the
Purchase Agreement shall have the same meaning when used herein, and in case of
any conflict between this Agreement and the Purchase Agreement, this Agreement
shall govern.

WHEREAS,

Assignor is the "Buyer" under the Purchase Agreement and desires to assign to
Assignee all of its rights and obligations with respect to the twenty (20)
unexercised Option Aircraft, and seventeen additional option aircraft positions
that were connected to the Purchase Agreement (the "Assigned Aircraft"), and
Assignee is willing to accept such assignment on the terms and conditions of
this Agreement;

In connection with this assignment, Assignor will also assign to Assignee its
post-delivery rights under the Purchase Agreement with respect to (i) all
forty-eight (48) aircraft previously delivered to Chautauqua Airlines, Inc.
("Chautauqua") as operator (the "Delivered Aircraft") and (ii) any of the
Remaining Solitair Aircraft that are delivered to Chautauqua as operator; and

Assignor will retain its rights and obligations with respect to the five (5)
exercised Option Aircraft that have not been delivered as of the date of this
Agreement (the "Remaining Solitair Aircraft").

NOW, THEREFORE, for good and valuable consideration, receipt of which is hereby
acknowledged, Assignee and Assignor agree as follows:

1.    ASSIGNMENT AND ASSUMPTION

1.1.  The Assignor hereby irrevocably assigns, conveys, transfers and delegates
      to the Assignee:

                                                                     Page 1 of 4

----------------
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.

<Page>

            (a)   all its rights and obligations under the Purchase Agreement
                  and Letter Agreement DCT-026/98, dated as of June 17, 1998
                  between Solitair and Embraer, as amended (the "Letter
                  Agreement"), in regard to the Assigned Aircraft; and

            (b)   all its remaining rights with respect to the Delivered
                  Aircraft under the Purchase Agreement and Letter Agreement

      (the "Assigned Rights and Obligations"), subject to the terms and
      conditions herein. This assignment shall be effective as of the date
      provided below in Section 3 and the obligations of Assignor and Assignee
      hereunder shall be deemed to have begun on that date.

1.2.  The Assignee hereby irrevocably accepts the assignment, conveyance,
      transfer and delegation by the Assignor of the Assigned Rights and
      Obligations above and agrees to be bound by and perform all the
      obligations resulting from such assignment. The Assignee further
      undertakes to perform all obligations, undertakings and covenants in
      regard to the Assigned Rights and Obligations as if the Assignee had been
      an original party to the Purchase Agreement, and the Assignor shall have
      no liability to Embraer in regard to the Assigned Rights and Obligations;
      provided that, for the avoidance of doubt, nothing herein shall limit,
      reduce or otherwise affect Assignor's liability to Embraer under the
      Purchase Agreement or Letter Agreement for any events prior to the
      effective date of this Agreement.

1.3.  Assignor hereby agrees that promptly after delivery of each of the
      Remaining Solitair Aircraft, Assignor will assign to Assignee its
      remaining rights under the Purchase Agreement and Letter Agreement with
      respect to such Aircraft.

2.    ASSIGNOR RETAINS CERTAIN RIGHTS AND OBLIGATIONS

2.1. All rights and obligations not expressly included in the partial assignment
described in clause 1.1. above are hereby retained by the Assignor, and the
Assignee shall have no rights or obligations with respect to such retained
rights. Notwithstanding anything to the contrary herein, Assignor shall remain
responsible for its obligations pursuant to Article 27 of the Purchase
Agreement.

3.    SUBJECT TO EFFECTIVENESS OF AMENDED AND RESTATED PURCHASE AGREEMENT

This Agreement shall become effective at the time Buyer shall have either (x)
issued shares pursuant to its public offering, which is now contemplated to
occur during the month of May, 2002, or (y) notifed Embraer in writing that the
Agreement shall become effective immediately. If this Agreement does not become
effective on or before June 28, 2002, it shall be null and void.

                                                                     Page 2 of 4
<Page>

Following the effectiveness of this Agreement, Embraer shall [*] deposits
(consisting of [*] for each of [*]) to Assignor without interest promptly
after Embraer [*] from Assignee in accordance with Article 24.a of the
Amended and Restated Purchase Agreement between Embraer and Assignee.

4.    MISCELLANEOUS

All terms and conditions of the Purchase Agreement that have not been
specifically altered or modified hereunder shall remain in full force and
effect and time is of the essence under this Agreement.

[The remainder of this page has been left blank intentionally.]

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* Confidential

                                                                     Page 3 of 4
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IN WITNESS WHEREOF, the Parties have caused this Agreement to be duly executed
and delivered by their proper and duly authorized officers and to be effective
as of the day and year first above written.

SOLITAIR CORP.                          Republic Airways Holdings, Inc.

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

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

Witness:                                Witness:
        ---------------------                   ------------------------
Name:                                   Name:
     ------------------------                ---------------------------

Witness:
        ---------------------
Name:
     ------------------------

Acknowledged and Agreed:

EMBRAER - EMPRESA BRASILEIRA DE AERONAUTICA S.A.

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

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

Witness:
        ---------------------
Name:
     ------------------------

                                                                     Page 4 of 4<Page>
                                                                Exhibit 10.13(b)

                          AMENDMENT NUMBER 1 TO AMENDED
                   AND RESTATED PURCHASE AGREEMENT GCT-0215/98

This Amendment Number 1 to Amended and Restated Purchase Agreement GCT-025/98,
dated as of June 7, 2002 ("Amendment No. 1") 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. 1 is
between Embraer and Buyer, collectively referred to herein as the "Parties".

This Amendment No. 1 sets forth additional agreements between Embraer and Buyer
relative to the incorporation of 22 firm aircraft and 30 option aircraft to the
Agreement with certain specific and exclusive conditions for aircraft to be
operated by Buyer's designee Chautauqua Airlines, Inc., for Delta Air Lines,
Inc. These aircraft are in addition to the already existing 37 option aircraft.

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. 1, which are not defined herein shall have the meaning given in
the Purchase Agreement. In the event of any conflict between this Amendment No.
1 and the Purchase Agreement the terms, conditions and provisions of this
Amendment No. 1 shall control.

WHEREAS, the effectiveness of the Purchase Agreement was subject to Buyer
delivering a notice to Embraer stating that the Agreement was effective, and
Buyer has delivered such a notice to Embraer.

WHEREAS, in connection with the Parties' agreements with respect to additional
aircraft and other terms and conditions, 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.       DEFINITION: Article 1.b shall be deleted and replaced with the
         following:

         b.1. EMB-145 Aircraft - shall mean the EMB-145 LR aircraft or, where
         there is more than one of such aircraft, each of such Aircraft
         (including Firm Aircraft and Option Aircraft, as the context requires),
         manufactured by Embraer, for sale to Buyer pursuant to this Agreement,
         according to the Technical Description number TD-145/010, dated January
         1998 (Appendix I), the Aircraft Specific Configuration, Finishing and
         Registration Marks described in Attachment `A-3' (or with respect to
         Other Option EMB-145 Aircraft, Attachment 'A-1' or 'A-2', if Buyer
         notifies Embraer that it desires to receive the Aircraft in one of
         these alternative configurations [*] and as may be amended from time to
         time by Buyer at its expense as specified in Article 11. [*].

         b.2. EMB-135 Aircraft - shall mean the EMB-135 LR aircraft or, where
         there is

                                                                     Page 1 of 7
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*  Confidential
   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.

<Page>

         more than one of such aircraft, each of such Aircraft (including Firm
         Aircraft and Option Aircraft, as the context requires), manufactured by
         Embraer, for sale to Buyer pursuant to this Agreement, according to the
         Technical Description number TD-135/005, dated June 2001 (Appendix I),
         the Aircraft Specific Configuration, Finishing and Registration Marks
         described in Attachment 'A-4', and as may be amended from time to time
         by Buyer at its expense as specified in Article 11. [*]

         b.3. Delta Aircraft - shall mean the Firm and Option EMB-145 Delta
         Aircraft and EMB-135 Delta Aircraft, as each term is defined in Article
         2.a.

2.       SUBJECT: Article 2.a shall be deleted and replaced with the following:

         a.       Upon the terms and conditions contained in this Agreement,
                  Embraer shall sell and Buyer shall purchase and take delivery
                  of:

                  o        Fifteen (15) EMB-135 firm Aircraft ("Firm EMB-135
                           Delta Aircraft") and seven (7) EMB-145 firm Aircraft
                           ("Firm EMB-145 Delta Aircraft"), as indicated on the
                           table provided below in Section 4; and

                  o        if Buyer so elects, up to thirty (30) EMB-145 option
                           Delta Aircraft ("Option Delta Aircraft") and
                           thirty-seven (37) other option EMB-145 Aircraft
                           ("Other Option EMB-145 Aircraft"), as indicated in
                           the table provided below in Section 5.

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
                  EMS-145 Delta Aircraft.

         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.

         B.       Article 3.c shall be deleted and replaced with the following:

                  "c. The Aircraft Basic Price shall be escalated according to
                  the formula contained in Attachment "D-1" for all Delta
                  Aircraft and Attachment "D" for all Aircraft other than Delta
                  Aircraft, and as set forth herein. Such price as escalated
                  shall be the Aircraft Purchase Price and it will be provided
                  to Buyer [*] prior to each Aircraft Contractual Delivery
                  Date."

4.  DELIVERY SCHEDULE: The following delivery schedule shall be inserted just
after Article 5.a. The wording in the last two lines of Article 5.a
("..according to the schedule set forth in Article 24 and subject to the terms
of that article".) shall be deleted.

                                                                     Page 2 of 7
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*  Confidential

<Page>

<Table>
<Caption>
----------------------------------------------------------------------------------------------------------------------
                                                         [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
<S>                        <C>                               <C>                          <C>
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                     October 2002
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                    September 2003
-------------------------- --------------------------------- ---------------------------- ----------------------------
</Table>

                                                                     Page 3 of 7
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*  Confidential

<Page>

5.       OPTION AIRCRAFT:

         5.1      The Option Aircraft delivery schedule of Article 24 shall be
                  deleted and replaced with the following:
<Table>
<Caption>
----------------------------------------------------------------------------------------------------------------------
                                                         [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
<S>                        <C>                               <C>                          <C>
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                      April 2003
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
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           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
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           [*]                           [*]                             [*]                          [*]
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           [*]                           [*]                             [*]                          [*]
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           [*]                           [*]                             [*]                          [*]
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           [*]                           [*]                             [*]                          [*]
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           [*]                           [*]                             [*]                          [*]
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           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------

                                                                     Page 4 of 7
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*  Confidential

<Page>

-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
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           [*]                           [*]                             [*]                          [*]
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           [*]                           [*]                             [*]                          [*]
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           [*]                           [*]                             [*]                          [*]
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           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                          [*]
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           [*]                           [*]                             [*]                          [*]
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           [*]                           [*]                             [*]                          [*]
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           [*]                           [*]                             [*]                          [*]
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           [*]                           [*]                             [*]                          [*]
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           [*]                           [*]                             [*]                          [*]
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           [*]                           [*]                             [*]                          [*]
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           [*]                           [*]                             [*]                          [*]
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           [*]                           [*]                             [*]                          [*]
-------------------------- --------------------------------- ---------------------------- ----------------------------
           [*]                           [*]                             [*]                     January 2007
-------------------------- --------------------------------- ---------------------------- ----------------------------
</Table>

5.2  Items e. and f. of Article 24 shall be deleted and replaced with the
following:

e. CONFIRMATION OF OPTION [*]: Buyer's options to purchase Option Aircraft shall
be confirmed on or before [*] prior to the delivery date of the each Option
Aircraft [*] At that time, [*], as each has been amended as of the confirmation
date and at the Basic Price then applicable for an Aircraft [*]), including
whether each exercised Aircraft shall be a Delta Aircraft. Buyer may confirm no
more than [*] total Option Aircraft as Delta Aircraft. At the time of each
confirmation, [*]

f. FAILURE TO CONFIRM; [*] If Buyer fails to confirm [*] as provided in item
"e", Buyer shall have no right to acquire that Option Aircraft and the relevant
portion of the deposit made according to item "d.1" above, if any, shall be
[*]Buyer's failure to confirm, renunciation of, or failure to obtain,
[*]commencing on the date [*]In the event Embraer fails to [*]

                                                                     Page 5 of 7
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*  Confidential

<Page>

6. SERVICES: Article 13.e.2 and 3 of the Purchase Agreement are hereby deleted
and replaced with the following:

         "2. One (1) Maintenance Familiarization Course [*]. This course shall
         consist of classroom familiarization with Aircraft systems and
         structures and shall be in accordance with ATA specification 104, level
         III." [*]

         3. One (1) Flight Attendant Familiarization Course [*]. This course
         shall consist of classroom familiarization, including a general
         description of Aircraft and systems to be used by flight attendants if
         requested, Embraer may demonstrate procedures described in the
         classroom, subject to Buyer's Aircraft availability. [*]"

7. EMB-135 AIRCRAFT CONFIGURATION: Attachment "A-3" (EMB-135 Delta Aircraft
configuration) and Attachment "A-4" (EMB-145 Delta Aircraft configuration) to
this Amendment shall be included in the Purchase Agreement, reflecting the
configuration selected by Buyer for the EMB-135 Delta Aircraft and EMB-145 Delta
Aircraft.

8. MISCELLANEOUS: All other provisions of the Agreement which have not been
specifically amended or modified by this Amendment No. 1 shall remain valid in
full force and effect without any change.

                                                                     Page 6 of 7
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*  Confidential

<Page>

IN WITNESS WHEREOF, EMBRAER and BUYER, by their duly authorized officers, have
entered into and executed this Amendment No. 1 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                                         By
   -----------------------------------        ----------------------------------

Name:                                      Name:

Title:                                     Title:

By                                         DATE:
   -----------------------------------

Name:                                      Place:

Title:

DATE:

Place:

Witness:                                   Witness:
          ----------------------------              ----------------------------

Name:                                      Name:
       -------------------------------              ----------------------------

                                                                     Page 7 of 7

<PAGE>

--------------------------------------------------------------------------------
                                ATTACHMENT "A-3"
                   EMB-145 AIRCRAFT UNDER DELTA CONFIGURATION
--------------------------------------------------------------------------------

        AIRCRAFT SPECIFIC CONFIGURATION, FINISHING AND REGISTRATION MARKS

1.  STANDARD AIRCRAFT

     The Aircraft shall be manufactured according to the standard configuration
     specified in the Technical Description TD-145/010, dated January 1998
     (Appendix I) (the "Technical Description") and the optional equipment
     described in item 2 below.

2.  OPTIONAL EQUIPMENT

    2.1  OPTIONS TO THE STANDARD AVIONICS CONFIGURATION
         [*]

    2.2  OPTIONAL SYSTEM/OTHER EQUIPMENT
         [*]

    2.3  INTERIOR OPTIONAL ITEMS
         [*]

3.       FINISHING

         a.       EXTERIOR FINISHING:

                  The Aircraft shall be painted according to the Delta color and
                  paint scheme, which has been supplied to Embraer by Buyer.

         b.       INTERIOR FINISHING:

                  Buyer has informed Embraer of its choice of materials and
                  colors of all and any item of interior finishing such as seat
                  covers, carpet, floor lining on galley areas, side walls and
                  overhead lining, galley lining and curtain. In case Buyer
                  elects to use different materials and or patterns, such
                  schedule shall be agreed between the Parties at the time of
                  signature of this Purchase Agreement.

4.       REGISTRATION MARKS

         The Aircraft shall be delivered to Buyer with the registration marks
         painted on them, which shall be supplied to Embraer by Buyer no later
         than ninety (90) days before each relevant Aircraft Contractual
         Delivery Date.

     IF THERE IS ANY CONFLICT BETWEEN THE TERMS OF THIS ATTACHMENT "A-3" AND THE
     TERMS OF THE TECHNICAL DESCRIPTION, THE TERMS OF THIS ATTACHMENT "A-3"
     SHALL PREVAIL.

     ----------------------
     *Confidential

<PAGE>

--------------------------------------------------------------------------------
                                ATTACHMENT "A-4"
                   EMB-135 AIRCRAFT UNDER DELTA CONFIGURATION
--------------------------------------------------------------------------------

        AIRCRAFT SPECIFIC CONFIGURATION, FINISHING AND REGISTRATION MARKS

1.  STANDARD AIRCRAFT

     The Aircraft shall be manufactured according to the standard configuration
     specified in the Technical Description number TD-135/005, dated June 2001
     (Appendix I) (the "Technical Description") and the optional equipment
     described in item 2 below.

2.  OPTIONAL EQUIPMENT

    2.1  OPTIONS TO THE STANDARD AVIONICS CONFIGURATION
         [*]

    2.2  OPTIONAL SYSTEM/OTHER EQUIPMENT
         [*]

    2.3  INTERIOR OPTIONAL ITEMS
         [*]

3.       FINISHING

         a.       EXTERIOR FINISHING:

                  The Aircraft shall be painted according to the Delta color and
                  paint scheme, which has been supplied to Embraer by Buyer.

         b.       INTERIOR FINISHING:

                  Buyer has informed Embraer of its choice of materials and
                  colors of all and any item of interior finishing such as seat
                  covers, carpet, floor lining on galley areas, side walls and
                  overhead lining, galley lining and curtain. In case Buyer
                  elects to use different materials and or patterns, such
                  schedule shall be agreed between the Parties at the time of
                  signature of this Purchase Agreement.

4.       REGISTRATION MARKS

         The Aircraft shall be delivered to Buyer with the registration marks
         painted on them, which shall be supplied to Embraer by Buyer no later
         than ninety (90) days before each relevant Aircraft Contractual
         Delivery Date.

     IF THERE IS ANY CONFLICT BETWEEN THE TERMS OF THIS ATTACHMENT "A-4" AND THE
     TERMS OF THE TECHNICAL DESCRIPTION, THE TERMS OF THIS ATTACHMENT "A-4"
     SHALL PREVAIL.

     --------
     * Confidential

<PAGE>
--------------------------------------------------------------------------------
                                ATTACHMENT "D-1"
--------------------------------------------------------------------------------

         [*]

--------
* Confidential

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