Exhibit 10.41A(1)



Atlantic Coast Airlines
xAmended
xxAdded
                        CONTRACT CHANGE ORDER


PURCHASER:                Atlantic Coast Airlines

PURCHASE AGREEMENT NO.:   RJ-0454 (the "Agreement") AIRCRAFT TYPE:
CRJ

C.C.O. NO.:               1                         DATED:
September 24, 1999

PAGES:                    9


REASON FOR CHANGE

To amend the Purchase Agreement and Letter Agreement No. 001 to:
(i) revise the Schedule Delivery Dates for the xxxxxx Aircraft and
to increase the order to six (6) Firm Aircraft, (ii) extend the term
of the FSR due to the additional three (3) Aircraft being acquired,
(iii) extend the term of the revision services due to the change in
the delivery position of the xxxxxx Aircraft, (iv) provide a xxxxxx
for the credit memorandum to be issued for each of the xxxxxx
Aircraft and, (v) to provide a xxxxxx credit memorandum for the
xxxxxx Aircraft.


    PAGES TO BE SUBSTITUTED        NEW/REVISED PAGES
                                    
    Purchase Agreement page 52         Attachment 1 to CCO No. 1
    Purchase Agreement page no. C-1    Attachment 2 to CCO No. 1
    Purchase Agreement page no. C-24   Attachment 3 to CCO No. 1
    Letter Agreement No. 001           Attachment 4 to CCO No. 1
    Letter Agreement No. 009 page 2    Attachment 5 to CCO No. 1


DESCRIPTION OF CHANGE:

P.A. and all Letter Agreements
All references to three (3) Aircraft are hereby changed to refer to
   six (6) Aircraft.

P.A. Page 52 - Appendix II (Delivery Schedule)
The Delivery Schedule is amended by revising the Scheduled Delivery
Dates for the xxxxxx and adding Scheduled Delivery Dates for the
xxxxxx Aircraft.

P.A. Page C-1 - (FSR  Term)
The term for the FSR is amended from xxxxxx to xxxxxx.

P.A. page C-24 - NOTE 1: Revision Service
The term for the revision services is amended from xxxxxx following
the Delivery Date of Buyer's first Aircraft.

Letter Agreement No. 001
Letter Agreement No. 001 is hereby deleted and replaced with Letter
Agreement No. 001A to incorporate changes to reflect the xxxxxx of
the credit memorandum to be issued for the xxxxxx Aircraft and to
provide a xxxxxx credit memorandum for the xxxxxx Aircraft.

Letter Agreement No. 009 page 2
Letter Agreement No. 009 is amended to reflect that it shall not
apply to the xxxxxx credit memorandum provided for the Aircraft set
forth in Article 3.0 of Letter Agreement No. 001A.
Notwithstanding Article 5.1 of the Agreement, Buyer confirms that it
has not yet made a deposit of xxxxxx for the Fourth, Fifth, and
Sixth Aircraft, totaling a further xxxxxx.  This deposit shall be
made by Buyer to Bombardier on or before October 1, 1999.

This CCO No. 1 is conditional upon Buyer receiving approval from its
Board of Directors xxxxxx (the "Approval Date").  In the event that
the Board of Directors does not approve the execution of this CCO
No. 1, together with CCO No. 15 to Purchase Agreement No. 0350, by
the Approval Date, Buyer may terminate this CCO No. 1, together with
CCO No. 15 to Purchase Agreement No. 0350, by giving written notice
to Bombardier of its intention to do so by such Approval Date.
Should Buyer fail to notify Bombardier by the Approval Date, this
CCO No. 1, together with CCO No. 15 to Purchase Agreement No. 0350,
shall become unconditionally valid and binding.


EXCEPT AS SET FORTH ABOVE OR IN THE ATTACHMENTS HERETO, ALL OTHER
TERMS AND CONDITIONS OF THE AGREEMENT WILL REMAIN UNCHANGED

FOR AND ON BEHALF OF:                   FOR AND ON BEHALF OF:

Bombardier Inc.                         Atlantic Coast Airlines
Bombardier Aerospace
Regional Aircraft

Signed:  __________________________
                                        Signed:______________________


Date:     __________________________    Date:________________________

                             APPENDIX II



                          DELIVERY SCHEDULE
                       
x    First Aircraft          xxxxxx
x    Second Aircraft         xxxxxx
x    Third Aircraft          xxxxxx
xx   Fourth Aircraft         xxxxxx
xx   Fifth Aircraft          xxxxxx
xx   Sixth Aircraft          xxxxxx

                        CUSTOMER   SUPPORT SERVICES

ANNEX A -      TECHNICAL SUPPORT, SPARE PARTS, TRAINING AND
               TECHNICAL DATA

The  following Customer Support Services are those services to which
reference is made in Article 3 of the Agreement.

ARTICLE 1 - TECHNICAL SUPPORT

1.1       Factory Service

Bombardier  agrees  to  maintain  or  cause  to  be  maintained  the
capability  to  respond to Buyer's technical inquiries,  to  conduct
investigations concerning maintenance problems and to issue findings
and recommend action thereon.  This service shall be provided for as
long  as  ten  (10)  CL-600-2B19 aircraft remain in  commercial  air
transport service.

1.2       Field Service Representative

1.2.1     Services

Bombardier shall assign one (1) Field Service Representative ("FSR")
to  Buyer's  main  base of operation or other  location  as  may  be
mutually agreed.

1.2.2     Term

x    Such  assignment  shall  be  for  xxxxxx,  and  shall  commence
approximately one (1) month prior to the Delivery Date of the  first
Aircraft. The FSR assignment may be extended on terms and conditions
to be mutually agreed.

1.2.3     Responsibility

  The FSR's responsibility shall be to provide technical advice to
Buyer for the line maintenance and operation of the Aircraft systems
 and troubleshooting during scheduled and unscheduled maintenance by
    Buyer's designated personnel ("FSR Services"). TECHNICAL DATA
                            REGIONAL JET



ITEM              DOC            CONF MEDIUM  QTY   REV  DEL ATA REMARKS
                                         
1.  AIRCRAFT MAINTENANCE MANUAL   G    1, 2  xxxxxx  Y   PTD  Y
    (AMM)
2.  ILLUSTRATED PARTS             G    1, 2  xxxxxx  Y   PTD  Y
    MANUAL/CATALOG (IPC)
3.  STRUCTURAL REPAIR MANUAL      G    1, 2  xxxxxx  Y   PTD  Y
    (SRM)
4.  COMPONENT MAINTENANCE MANUAL  G    1, 2  xxxxxx  Y   PTD  Y
    (CMM)
5.  POWER PLANT BUILD-UP MANUAL   G    1, 2  xxxxxx  Y   PTD  Y
6.  WIRING DIAGRAM MANUAL         C    1, 2  xxxxxx  Y   PTD  Y
7.  ILLUSTRATED TOOL & EQUIPMENT  G    1, 2  xxxxxx  Y   PTD  Y
    MANUAL (ITEM)
8.  SERVICE BULLETINS             G    1     xxxxxx  S   PTD  Y  SEE NOTE 2
9.  NON DESTRUCTIVE TEST MANUAL   G    1     xxxxxx  Y   PTD  Y
    (NDT)
10. MAINTENANCE PROGRAM DOCUMENT  G    1     xxxxxx  S   PTD  Y  SEE NOTE 3
    (MPD)
11. FAA OR DOT AIRPLANE FLIGHT    C    1     xxxxxx  S   ATD  N
    MANUAL (AFM)
12. WEIGHT & BALANCE MANUAL       G    1     xxxxxx  Y   ATD  Y
13. MASTER MINIMUM EQUIPMENT LIST G    1     xxxxxx  S   ASAP N
    (MMEL)
14. QUICK REFERENCE HANDBOOK      C    1     xxxxxx  S   ATD  N
15. FLIGHT CREW OPERATING MANUAL  C    1     xxxxxx  S   ATD  N  SEE NOTE 1
    (FCOM)
16. MAINTENANCE TASK CARDS        C    3     xxxxxx  S   PTD  N
17. ACCESS PANELS AND             G    1     xxxxxx  N   PTD  N
    DOORS/COMPONENT LOCATION
    MANUAL
18. FLIGHT PLANNING & CRUISE      G    1     xxxxxx  S   ASAP N
    CONTROL MANUAL
19. AIRCRAFT CHARACTERISTICS FOR  G    1     xxxxxx  N   ASAP N  SEE NOTE 4
    AIRPORT PLANNING
20. ON-BOARD WIRING DIAGRAM BOOK  C    3     xxxxxx  N   ATD  N  SEE NOTE 5
21. MAINTENANCE FACILITIES &      G    1     xxxxxx  S   ASAP N
    EQUIPMENT PLANNING MANUAL
22. SYSTEM SCHEMATIC MANUAL (SSM) G    1, 2  xxxxxx  Y   ATD  Y  SEE NOTE 1
23. PASSENGER INFORMATION SHEET   G    3     xxxxxx  S   ATD  N  SEE NOTE 6
24. PILOT CHECKLIST               C    4     xxxxxx  S   ATD  N
25. CRASH CREW CHART              G    4     xxxxxx  S   ATD  N
26. DISPATCH DEVIATION GUIDE      G    1     xxxxxx  S   PTD  N

NOTE 1: REVISION SERVICE

A.   Revision  services shall be available without  charge  for
     xxxxxx  following  the  Delivery  Date  of  Buyer's  first
     Aircraft.   Subsequent revision service shall be  provided
     dependent upon incorporation of Bombardier issued  Service
     Bulletins.

B.   Revisions to the Technical Data to reflect the Aircraft at
     Delivery  Date shall be provided to Buyer within  six  (6)
     months  following  the  Delivery  Date  of  each  of   the
     Aircraft, respectively.

C.   Provided the revision service is being supplied under  the
     terms  of this Agreement or by subsequent purchase  order,
     Bombardier  shall incorporate in the applicable  documents
     all applicable Bombardier originated Service Bulletins  in
     a  regular revision following formal notification by Buyer
     that  such Service Bulletins shall be accomplished on  the
     Buyer's  Aircraft.   The manuals shall then  contain  both
     original  and  revised configuration until  Buyer  advises
     Bombardier in writing that one configuration is no  longer
     required.

September 24, 1999

Atlantic Coast Airlines
515A Shaw Road,
Dulles, Virginia,
U.S.A. 20166

Gentlemen,

Letter  Agreement  No. 001A to Purchase Agreement  No.  PA-0454
dated  July  29, 1999 (the "Agreement" between Bombardier  Inc.
("Bombardier")  and Atlantic Coast Airlines ("Buyer")  relating
to  the purchase of six (6) Canadair Regional Jet Aircraft (the
"Aircraft")

This Letter Agreement No. 001A dated September 24, 1999 cancels
and supersedes Letter Agreement No. 001 dated July 29, 1999.

Subject:       Credit Memoranda

1.0  This  letter constitutes an integral part of the Agreement
     and  evidences our further agreement with the matters  set
     forth  below.  All terms used herein and in the  Agreement
     and not defined herein, shall have the same meaning as  in
     the Agreement.

2.0  In  consideration of Buyer having entered into  the  above
     referenced Agreement for the purchase of six (6)  Aircraft
     (and  for the exercise of any Option Aircraft (as  defined
     in  Letter Agreement No. 003)), Bombardier will  issue  to
     Buyer,  upon  delivery and payment of  the  price  of  the
     Aircraft in accordance with the Agreement,

     (i)   for  each  of  the  xxxxxx Aircraft  (including  any
     delivered Option Aircraft),   a credit memorandum  in  the
     amount of  xxxxxx; and

     xxxxxx

3.0  In  consideration of Buyer having entered into  the  above
     referenced Agreement, Bombardier will issue to Buyer, upon
     delivery  and  payment of the price  of  the  Aircraft  in
     accordance  with  the Agreement, for each  of  the  xxxxxx
     Aircraft  (excluding  any delivered  Option  Aircraft),  a
     xxxxxx credit memorandum in the amount of xxxxxx .

4.0  xxxxxx  The  credit memorandum will xxxxxx be adjusted  on
     the same pro-rata percentage calculation as other aircraft
     price changes due to changes in the Specification or Buyer
     selected  optional features as otherwise provided  for  in
     this  Agreement.  The credit memorandum, as adjusted, will
     collectively be known as the "Credit Memoranda".

5.0  In  the  event  of the Termination of the Agreement,  this
     Letter Agreement shall become automatically null and  void
     with respect to any undelivered Aircraft.

6.0  The  provisions of this Letter Agreement are  personal  to
     Buyer  and shall not be assigned or otherwise disposed  of
     by  Buyer,  except as required for financing  purposes  in
     accordance  with Letter Agreement No. 004 (Financing)  and
     except  as  part  of  an assignment of  the  Agreement  as
     expressly  permitted  in  Article  20  of  the  Agreement,
     without the prior written consent of Bombardier.

Should there be any inconsistency between this Letter Agreement
and the Agreement with respect to the subject matter covered by
the terms hereof, then this Letter Agreement shall prevail.

Yours truly,

BOMBARDIER INC.

________________________                Date:_____________
Scott Preece
Director, Contracts

Acknowledged and Accepted

Atlantic Coast Airlines

________________________                Date:_____________
Name:
Title:

Attachment No. 5 to C.C.O. No. 2 dated August 2, 2000
Letter Agreement 009
Reconciliation

xxxxxx

3.0 xxxxxx

4.0 This  letter  constitutes an integral part of the  Agreement  and
    evidences  our  further  agreement with  the  matters  set  forth
    below.   All  terms  used  herein and in the  Agreement  and  not
    defined herein, shall have the same meaning as in the Agreement.

5.0 The  provisions  of this Letter Agreement are personal  to  Buyer
    and  shall  not  be assigned or otherwise disposed  of  by  Buyer
    except  as  part of an assignment of the Agreement (in whole  not
    in  part)  expressly permitted under Article 20 of the  Agreement
    and otherwise such consent shall not be unreasonably withheld.

6.0 In  the  event of the Termination of the Agreement,  this  Letter
    Agreement  shall become automatically null and void with  respect
    to any undelivered Aircraft.


                        CONTRACT CHANGE ORDER


PURCHASER: Atlantic Coast Airlines

PURCHASE AGREEMENT NO.:  RJ-0454 (the "Agreement")AIRCRAFT TYPE: CRJ

C.C.O. NO                 2      DATED: August 2, 2000

PAGES:                    27


REASON FOR CHANGE

To amend the Agreement to:  (i) give effect to the exercise by Buyer
of seventeen (17) Option Aircraft and provide Buyer with thirteen
(13) incremental Aircraft and thereby increase the order to thirty-
six (36) firm Aircraft, (ii) revise the payment terms for the
Aircraft, (iii) revise the amount of the credit memorandum
applicable to the Aircraft, (iv) provide Buyer with an additional
xxxxxx credit memorandum for the Aircraft, (v) provide Buyer with an
additional forty (40) Option Aircraft, subject to certain
conditions, (vi) provide that Letter Agreement No. 009
(Reconciliation) shall be applicable to the additional xxxxxx credit
memorandum for the Aircraft as provided herein, (vii) amend the
Assignment Letter Agreement to reconfirm assignability to "Newco",
subject to certain conditions and to confirm assignability to
Atlantic Coast Jet, Inc xxxxxx subject to certain conditions, (viii)
note that a credit has been provided by Bombardier with respect to
the complex paint scheme in Buyer Selected Optional Features
resulting in this option being provided at xxxxxx, (ix) extend the
term of the FSR due to the additional thirty (30) Aircraft being
acquired, (x) extend the term of the revision services due to
xxxxxx, and (xi) amend Article 4 of Letter Agreement No. 005 to
clarify the procedure by which Buyer xxxxxx


PAGES TO BE SUBSTITUTED             NEW/REVISED PAGES
                                 
Purchase Agreement page 12-12a      Attachment 1 to CCO No. 2
Purchase Agreement page no. 52      Attachment 2 to CCO No. 2
Purchase Agreement page no. C-1     Attachment 3 to CCO No. 2
Purchase Agreement page no. C-24    Attachment 4 to CCO No. 2
Letter Agreement No. 001B           Attachment 5 to CCO No. 2
Letter Agreement No. 002A           Attachment 6 to CCO No. 2
Letter Agreement No. 004 pages 1&3  Attachment 7 to CCO No. 2
Letter Agreement No. 005 page 3     Attachment 8 to CCO No. 2
Letter Agreement No. 006 page 2     Attachment 9 to CCO No. 2
Letter Agreement No. 009 page 2     Attachment 10 to CCO No. 2
Letter Agreement No. 012            Attachment 11 to CCO No. 2


DESCRIPTION OF CHANGE:

P.A. and all Letter Agreements
All references to six (6) Aircraft are hereby changed to refer to
thirty-six (36) Aircraft.

P.A. Page 12 - Article 5.2 (Payment)
Article 5 - Payment is amended to reflect the acknowledgement of a
deposit for xxxxxx Aircraft only and to change the payment terms for
the Aircraft from xxxxxx of the Aircraft Base Price less the deposit
at each of xxxxxx prior to the Scheduled Delivery Date of xxxxxx to
the following: xxxxxx

P.A. Page 52 - Appendix II (Delivery Schedule)
The Delivery Schedule is amended to add the seventeen (17) Option
Aircraft being exercised and the thirteen (13) incremental Aircraft
being purchased.

P.A. Page C-1 - (FSR  Term)
The term for the FSR is amended from xxxxxx due to the exercise of
the seventeen (17) Option Aircraft and the purchase of thirteen (13)
incremental Aircraft.

P.A. page C-24 - NOTE 1: Revision Service
The term for the revision services is amended from xxxxxx following
the Delivery Date of Buyer's first Aircraft.

P.A. Appendix IV - Buyer Selected Optional Features
It is hereby noted that xxxxxx for CR Ref. N 11-300 resulting in
this optional feature being incorporated on the Aircraft xxxxxx as
it is shown in Appendix IV of the Agreement.

In addition, Bombardier agrees that `CR N 34-335 FMS - Single, ACARS
Capable' will replace 'CR N 34-330 FMS - Single (collins FMS-4200)',
and the xxxxxx shall be incorporated into the Aircraft, subject to
Bombardier's lead times and xxxxxx CRN 34-335 shall appear in
Appendix IV to the Agreement xxxxxx CR N 34-330 and such change will
be reflected in a Contract Change Order to be finalized by the
parties.

Letter Agreement No. 001 - (Credit Memorandum)
Letter Agreement No. 001A is hereby deleted and replaced with Letter
Agreement No. 001B to incorporate changes to reflect the xxxxxx of
the credit memorandum to be issued for the Aircraft and to delete
Article 3.0 referring to the xxxxxx for the xxxxxx Aircraft.

Letter Agreement No. 002 - (Assignment)
Letter Agreement No. 002 is hereby amended by deleting reference to
""up to three (3) of the Aircraft (Aircraft 1-3)" and replacing it
with "the Aircraft" and to reconfirm assignability to "Newco",
subject to certain conditions, and to confirm assignability to
Atlantic Coast Jet, Inc.xxxxxx, subject to certain conditions.

Letter Agreement No. 003 - (Option Aircraft)
Letter Agreement No. 003 is no longer applicable and is hereby
canceled. (New Option Aircraft Letter Agreement  (LA 12) introduced
below).

Letter Agreement No. 004 - (Financing)
Letter Agreement No. 004 is hereby amended by deleting reference to
"xxxxx and replacing it with xxxxx"  In addition, Article 4.0 is
amended to provide that the xxxxxx.

Letter Agreement No. 005 - Additional Customer Support
Article 4.0 of Letter Agreement No. 005 is amended to provide a
   procedure by which Buyer xxxxxx
Letter Agreement No. 006 - (xxxxxx Credit)
Letter Agreement No. 006 is hereby amended to add an additional
xxxxxx credit memorandum in the amount of xxxxxx for each of the
delivered Aircraft.
Letter Agreement No. 009 - (Reconciliation)
Letter Agreement No. 009 is hereby amended to provide that its terms
are applicable to the additional xxxxxx credit memorandum provided
for the Aircraft as set forth in the above paragraph and to provide
for the xxxxxx.

Letter Agreement No. 012 - (Additional Option Aircraft)
Letter Agreement No. 012 is introduced to provide Buyer with an
additional forty (40) Option Aircraft, on terms and conditions
provided therein.  Notwithstanding the Delivery Schedule, as
amended, prior to this CCO No. 2 becoming a firm agreement for the
Conditional Aircraft, Bombardier agrees to provide xxxxxx

xxxxxx

For the purposes of clarity, upon receipt by Buyer of xxxxxx and
prompt notification thereof to Bombardier, subject to the completion
of the second condition precedent as set forth in the following
paragraph, and the receipt by Buyer of Buyer Board Approval as
described below, this CCO No. 2 and CCO No. 17 to PA 350 shall be in
full force and effect and shall no longer be conditional.

Buyer's acceptance of the Conditional Aircraft is further
conditioned upon xxxxxxx of the Conditional Aircraft, on terms
satisfactory to Buyer, within xxxxxx from the date of execution of
this CCO No. 2.  Notice provisions will be as provided for the
United Approval condition set forth above.

It is understood by the parties that Buyer has the right to increase
the number of firm Aircraft purchased pursuant to this CCO No. 2 by
up to an additional xxxxxx Aircraft on or before December 31, 2000
on the same terms and conditions for Aircraft as set forth in this
Agreement, by providing written notice to Bombardier,  in which
case: (i) the delivery positions for such additional firm Aircraft
shall be the delivery positions for the first equivalent number of
Option Aircraft as set forth in Attachment 11 hereto; (ii) Buyer
shall be granted an equivalent number of new Option Aircraft
pursuant to Attachment 11 such that Buyer retains a total of forty
(40) Option Aircraft on the same terms and conditions as for the
initial 40 Option Aircraft; (iii) the delivery positions for such
new Option Aircraft shall be the delivery positions for the first
equivalent number of Additional Option Aircraft as set forth in
Attachment 11; and (iv) Buyer shall be granted an equivalent number
of Additional Option Aircraft delivery positions pursuant to
Attachment 11 commencing in xxxxxx for the Additional Option
Aircraft after the above adjustments to delivery xxxxxx have
occurred at the rate of xxxxxx.

Should any of the Conditional Aircraft be terminated or increased as
provided above, the parties will amend the Agreement as well as
purchase agreement No. PA-0350 to adjust all terms for the revised
number of Aircraft, using the same methodology and formulas as was
utilized by CCO No. 17 to PA 350 and by this CCO No. 2.

This CCO No. 2 is conditional upon Buyer receiving approval from its
Board of Directors ("Buyer Board Approval") xxxxxx (the "Buyer Board
Approval Date").  In the event that the Board of Directors does not
approve the execution of this CCO No. 2, together with CCO No. 17 to
PA 350, by the Buyer Board Approval Date, Buyer may terminate this
CCO No. 2, together with CCO No. 17 to PA 350, by giving written
notice to Bombardier of its intention to do so by such Buyer Board
Approval Date.  Should Buyer fail to notify Bombardier by the time
specified above, this CCO No. 2, together with CCO No. 17 to PA 350,
shall become unconditionally valid and binding.

Except for the Buyer Board Approval, which is a condition precedent
to this CCO No. 2 and CCO No. 17 to PA 350, Buyer will be obligated
to purchase the xxxxxx, as defined in and subject to terms of
purchase agreement No. PA-0454 as amended by the agreed terms of
this CCO No. 2 and CCO No. 17 to PA 350.

Except for the United Approval, Buyer Board Approval and Buyer
reaching agreement with certain vendors as set forth above, all of
which are conditions precedent to this CCO No. 2 and CCO No. 17 to
PA 350, Buyer will be obligated to purchase the Conditional Aircraft
subject to the terms of the Agreement as amended by the agreed terms
of this CCO No. 2 and CCO No. 17 to PA 350.

EXCEPT AS SET FORTH ABOVE OR IN THE ATTACHMENTS HERETO, ALL OTHER
TERMS AND CONDITIONS OF THE AGREEMENT WILL REMAIN UNCHANGED
FOR AND ON BEHALF OF:                   FOR AND ON BEHALF OF:
Bombardier Inc.                         Atlantic Coast Airlines

Bombardier Aerospace
Regional Aircraft
Signed:  __________________________     Signed:______________
Date:     _________________________     Date:_______________


Attachment No. 1 to C.C.O. No. 2 dated August 2, 2000

 ARTICLE 5  -  PAYMENT

x5.1     Bombardier  acknowledges  having  previously  received   a
         deposit  of  xxxxxx for each of the xxxxxx  Aircraft  (the
         xxxxx Aircraft) xxxxxx, totaling xxxxxx.

x5.2     Advance Payment

x5.2.1   xxxxxx

xx5.2.2  xxxxxx

x5.2.3   In  addition,  Buyer  shall make  payment  or  cause
         payment to be made for each firm Aircraft as follows:

         xxxxxx

x        All payments referred to in paragraphs 5.2.3 (b), (c) and
         (d)  above  are  to be made on the first day of the  applicable
         month.

5.3      Payment Terms

         On  or  before  the  Delivery Date Bombardier  shall  have
         received in full the amount of the Aircraft Purchase Price
         of  such Aircraft less the amount of the applicable Credit
         Memorandum  as set out in Letter Agreement  No.  1,  which
         will   be  credited  by  Bombardier  toward  the  Aircraft
         Purchase  Price  (said  amount  being  the  "Net  Aircraft
         Purchase Price").

5.4      Subject  to  the provisions of Article 9.9 hereof,  should
         Buyer  fail to make any of the aforementioned payments  on
         or  before the stipulated date and Buyer does not  correct
         the   default  within  a  period  of  thirty   (30)   days
         thereafter,  this Agreement shall automatically  terminate
         and  Bombardier shall have no further obligation to  Buyer
         under  this Agreement, including the obligation to proceed
         further with the manufacture of the Aircraft on behalf  of
         Buyer  or  the  sale and/or delivery of  the  Aircraft  to
         Buyer.   Bombardier  shall have the option  (but  not  the
         obligation) of waiving such termination should Buyer  make
         arrangements  satisfactory to Bombardier for such  payment
         and  all future payments within ten (10) calendar days  of
         Buyer's default.

                             APPENDIX II

                          DELIVERY SCHEDULE


                              
          First Aircraft            xxxxxx
xx        Second Aircraft           xxxxxx
xx        Third Aircraft            xxxxxx
xx        Fourth Aircraft           xxxxxx
          Fifth Aircraft            xxxxxx
          Sixth Aircraft            xxxxxx
xx        Seventh Aircraft          xxxxxx
xx        Eighth Aircraft           xxxxxx
          Ninth Aircraft            xxxxxx
xx        Tenth Aircraft            xxxxxx
xx        Eleventh Aircraft         xxxxxx
          Twelfth Aircraft          xxxxxx
xx        Thirteenth Aircraft       xxxxxx
          Fourteenth Aircraft       xxxxxx
          Fifteenth Aircraft        xxxxxx
xx        Sixteenth Aircraft        xxxxxx
xx        Seventeenth Aircraft      xxxxxx
xx        Eighteenth Aircraft       xxxxxx
xx        Nineteenth Aircraft       xxxxxx
xx        Twentieth Aircraft        xxxxxx
xx        Twenty-first Aircraft     xxxxxx
xx        Twenty-second Aircraft    xxxxxx
xx        Twenty-third Aircraft     xxxxxx
xx        Twenty-fourth Aircraft    xxxxxx
xx        Twenty-fifth Aircraft     xxxxxx
xx        Twenty-sixth Aircraft     xxxxxx
xx        Twenty-seventh Aircraft   xxxxxx
xx        Twenty-eighth Aircraft    xxxxxx
xx        Twenty-ninth Aircraft     xxxxxx
xx        Thirtieth Aircraft        xxxxxx
xx        Thirty-first Aircraft     xxxxxx
xx        Thirty-second Aircraft    xxxxxx
xx        Thirty-third Aircraft     xxxxxx
xx        Thirty-fourth Aircraft    xxxxxx
xx        Thirty-fifth Aircraft     xxxxxx
xx        Thirty-sixth Aircraft     xxxxxx

                     CUSTOMER SUPPORT SERVICES


ANNEX A - TECHNICAL SUPPORT, SPARE PARTS, TRAINING AND
          TECHNICAL DATA


The  following Customer Support Services are those services to which
reference is made in Article 3 of the Agreement.

ARTICLE 1 - TECHNICAL SUPPORT

1.1    Factory Service

       Bombardier  agrees  to maintain or cause to be  maintained  the
       capability  to  respond  to  Buyer's  technical  inquiries,  to
       conduct investigations concerning maintenance problems  and  to
       issue  findings  and  recommend action thereon.   This  service
       shall  be provided for as long as ten (10) CL-600-2B19 aircraft
       remain in commercial air transport service.

1.2    Field Service Representative

1.2.1  Services

       Bombardier  shall  assign one (1) Field Service  Representative
       ("FSR") to Buyer's main base of operation or other location  as
       may be mutually agreed.

1.2.2  Term

x      Such  assignment  shall  be  for  xxxxxx,  and  shall  commence
       approximately one (1) month prior to the Delivery Date  of  the
       first  Aircraft. At Buyer's request, the term shall begin  upon
       the expiration of the term of Buyer's right to assignment of an
       FSR  pursuant  to  purchase  agreement  No.  PA-0350.  The  FSR
       assignment  may  be  extended on terms  and  conditions  to  be
       mutually agreed.

1.2.3  Responsibility

       The FSR's responsibility shall be to provide technical advice
       to Buyer for the line maintenance and operation of the Aircraft
       systems and troubleshooting during scheduled and unscheduled
       maintenance by Buyer's designated personnel ("FSR Services").


                           TECHNICAL DATA
                            REGIONAL JET


ITEM              DOC             CONF MEDIUM QTY  REV DEL ATA REMARKS
                                       
1.  AIRCRAFT MAINTENANCE MANUAL    G    1,2  xxxxxx Y  PTD  Y
    (AMM)
2.  ILLUSTRATED PARTS              G    1,2  xxxxxx Y  PTD  Y
    MANUAL/CATALOG (IPC)
3.  STRUCTURAL REPAIR MANUAL       G    1,2  xxxxxx Y  PTD  Y
    (SRM)
4.  COMPONENT MAINTENANCE MANUAL   G    1,2  xxxxxx Y  PTD  Y
    (CMM)
5.  POWER PLANT BUILD-UP MANUAL    G    1,2  xxxxxx Y  PTD  Y
6.  WIRING DIAGRAM MANUAL          C    1,2  xxxxxx Y  PTD  Y
7.  ILLUSTRATED TOOL & EQUIPMENT   G    1,2  xxxxxx Y  PTD  Y
    MANUAL (ITEM)
8.  SERVICE BULLETINS              G    1    xxxxxx S  PTD  Y  SEE NOTE 2
9.  NON DESTRUCTIVE TEST MANUAL    G    1    xxxxxx Y  PTD  Y
    (NDT)
10. MAINTENANCE PROGRAM DOCUMENT   G    1    xxxxxx S  PTD  Y  SEE NOTE 3
    (MPD)
11. FAA OR DOT AIRPLANE FLIGHT     C    1    xxxxxx S  ATD  N
    MANUAL (AFM)
12. WEIGHT & BALANCE MANUAL        G    1    xxxxxx Y  ATD  Y
13. MASTER MINIMUM EQUIPMENT LIST  G    1    xxxxxx S  ASAP N
    (MMEL)
14. QUICK REFERENCE HANDBOOK       C    1    xxxxxx S  ATD  N
15. FLIGHT CREW OPERATING MANUAL   C    1    xxxxxx S  ATD  N  SEE NOTE 1
    (FCOM)
16. MAINTENANCE TASK CARDS         C    3    xxxxxx S  PTD  N
17. ACCESS PANELS AND              G    1    xxxxxx N  PTD  N
    DOORS/COMPONENT LOCATION
    MANUAL
18. FLIGHT PLANNING & CRUISE       G    1    xxxxxx S  ASAP N
    CONTROL MANUAL
19. AIRCRAFT CHARACTERISTICS FOR   G    1    xxxxxx N  ASAP N  SEE NOTE 4
    AIRPORT PLANNING
20. ON-BOARD WIRING DIAGRAM BOOK   C    3    xxxxxx N  ATD  N  SEE NOTE 5
21. MAINTENANCE FACILITIES &       G    1    xxxxxx S  ASAP N
    EQUIPMENT PLANNING MANUAL
22. SYSTEM SCHEMATIC MANUAL (SSM)  G    1,2  xxxxxx Y  ATD  Y  SEE NOTE 1
23. PASSENGER INFORMATION SHEET    G    3    xxxxxx S  ATD  N  SEE NOTE 6
24. PILOT CHECKLIST                C    4    xxxxxx S  ATD  N
25. CRASH CREW CHART               G    4    xxxxxx S  ATD  N
26. DISPATCH DEVIATION GUIDE       G    1    xxxxxx S  PTD  N

NOTE 1:REVISION SERVICE

x    A.   Revision   services   shall   be   available  without
          charge  for  xxxxxx   following  the  Delivery   Date
          of   Buyer's  first  Aircraft.   Subsequent  revision
          service    shall    be   provided   dependent    upon
          incorporation of Bombardier issued Service Bulletins.

     B.   Revisions  to  the  Technical  Data  to  reflect  the
          Aircraft at Delivery Date shall be provided to  Buyer
          within six (6) months following the Delivery Date  of
          each of the Aircraft, respectively.

     C.   Provided the revision service is being supplied under
          the terms of this Agreement or by subsequent purchase
          order, Bombardier shall incorporate in the applicable
          documents   all   applicable  Bombardier   originated
          Service  Bulletins  in a regular  revision  following
          formal   notification  by  Buyer  that  such  Service
          Bulletins  shall  be  accomplished  on  the   Buyer's
          Aircraft.   The  manuals  shall  then  contain   both
          original   and  revised  configuration  until   Buyer
          advises  Bombardier in writing that one configuration
          is no longer required.

August 02, 2000

Atlantic Coast Airlines
515A Shaw Road,
Dulles, Virginia,
U.S.A. 20166

Gentlemen,

Letter  Agreement  No. 001B to Purchase Agreement  No.  PA-0454
dated  July  29, 1999 (the "Agreement" between Bombardier  Inc.
("Bombardier")  and Atlantic Coast Airlines ("Buyer")  relating
to  the  purchase  of  thirty-six (36)  Canadair  Regional  Jet
Aircraft (the "Aircraft")

This  Letter  Agreement No. 001B dated August 02, 2000  cancels
and  supersedes Letter Agreement No. 001A dated September,  24,
1999.

Subject:       Credit Memoranda

1.0  This  letter constitutes an integral part of the Agreement
     and  evidences our further agreement with the matters  set
     forth  below.  All terms used herein and in the  Agreement
     and not defined herein, shall have the same meaning as  in
     the Agreement.

2.0  In  consideration of Buyer having entered into  the  above
     referenced  Agreement for the purchase of thirty-six  (36)
     Aircraft,  Bombardier will issue to Buyer,  upon  delivery
     and  payment  of the price of the Aircraft  in  accordance
     with  the Agreement, a credit memorandum in the amount  of
     xxxxxx.

3.0  xxxxxx  The  credit memorandum will xxxxxx be adjusted  on
     the same pro-rata percentage calculation as other aircraft
     price changes due to changes in the Specification or Buyer
     selected  optional features as otherwise provided  for  in
     this  Agreement.  The credit memorandum, as adjusted, will
     collectively be known as the "Credit Memoranda".

4.0  In  the  event  of the Termination of the Agreement,  this
     Letter Agreement shall become automatically null and  void
     with respect to any undelivered Aircraft.

5.0  The  provisions of this Letter Agreement are  personal  to
     Buyer  and shall not be assigned or otherwise disposed  of
     by  Buyer,  except as required for financing  purposes  in
     accordance  with Letter Agreement No. 004 (Financing)  and
     except  as  part  of  an assignment of  the  Agreement  as
     expressly  permitted  in  Article  20  of  the  Agreement,
     without the prior written consent of Bombardier.

Should there be any inconsistency between this Letter Agreement
and the Agreement with respect to the subject matter covered by
the terms hereof, then this Letter Agreement shall prevail.

Yours truly,

BOMBARDIER INC.



________________________                Date:_____________
H. Anne Woodyatt
Director, Contracts


Acknowledged and Accepted

Atlantic Coast Airlines


________________________                Date:_____________
Name:
Title:

August 2, 2000


Atlantic Coast Airlines
515A Shaw Road
Dulles, Virginia,
U.S.A. 20166


Gentlemen,

Letter Agreement No. 002A to Purchase Agreement No. PA-0454 dated
July 29, 1999 (the "Agreement" between Bombardier Inc.
("Bombardier") and Atlantic Coast Airlines ("Buyer") relating to the
purchase of thirty-six (36) Canadair Regional Jet Aircraft (the
"Aircraft")

This Letter Agreement No. 002A dated August 02, 2000 cancels and
supersedes Letter Agreement No. 002 dated July 29, 1999.

Subject:  Assignment

Gentlemen:

This  letter  constitutes  an integral part  of  the  Agreement  and
evidences  our  further agreement with respect to  the  matters  set
forth  below.  All  terms used herein and in the Agreement  and  not
defined herein, shall have the same meaning as in the Agreement.

1.0  Buyer shall have the right to assign its right to purchase  and
     to  lease any or all of the Aircraft to a new corporation to be
     formed in the U.S. ("Newco") subject to:

     (i)  Newco shall be a U.S. citizen and an entity in which Buyer
       has at the time of the assignment a controlling interest;

     (ii) section 1110 of the U.S. Bankruptcy Code applies;

     (iii)  the  provisions  of Articles 20.1,  20.2,  20.3  of  the
       Agreement

     (iv)  the  condition  that all financings will  either  be  the
        direct obligation of Buyer or guaranteed by Buyer; and

     (v)  additional reasonable terms and conditions required due to
        the  different  structure  of the transaction  and  aircraft
        operations  following disclosure and due  diligence  of  the
        transaction envisaged.

2.0  Subject  to  the satisfaction of the foregoing, the  assignment
     pursuant  to  section 1.0 hereof shall then  be  an  assignment
     permitted pursuant to the terms of Article 20 of the Agreement,
     such  that  Newco  will be entitled to all individual  Aircraft
     benefits and obligations as contained in the Agreement.  xxxxxx

3.0  Notwithstanding the provisions of Article 20 of the  Agreement,
     paragraph  3.0 of Letter Agreement 006, or any other  terms  of
     the  Agreement or any Letter Agreement limiting  the  right  to
     Assignment, Buyer shall have the right to assign its  right  to
     purchase  and  to  lease any or all of the  Aircraft,  and  all
     rights  pertaining  thereto pursuant to this Agreement,  and/or
     may sell any of the Aircraft or assign the leases of any of the
     Aircraft,  to  Atlantic Coast Jet, Inc. a Delaware  corporation
     ("ACJet").   ACJet,  as  assignee,  will  be  entitled  to  all
     individual  Aircraft benefits and obligations as  contained  in
     this Agreement including all Letter Agreements, and Buyer shall
     have  no  further claim with respect to such assigned benefits.
     The  assignment  of  an  Aircraft fleet benefits  is  approved,
     provided  that ACJet is a wholly owned subsidiary or  affiliate
     of  Buyer at the time of assignment, and provided that  if  the
     liabilities  of Bombardier are increased as a result  of  ACJet
     operating  any of the Aircraft separate from Buyer, appropriate
     adjustments will be made as mutually agreed by the parties on a
     case  by  case  basis.  In the event that in the  future  ACJet
     ceases  to be a wholly owned subsidiary or affiliate of  Buyer,
     ongoing  rights  and obligations under Aircraft fleet  benefits
     and  obligations will be mutually agreed by the  parties  on  a
     case by case basis, xxxxxx

4.0  Notwithstanding the provisions of Article 20 of the  Agreement,
     paragraph  3.0 of Letter Agreement 006, or any other  terms  of
     the  Agreement or any Letter Agreement limiting  the  right  to
     Assignment, Buyer shall have the right to assign its  right  to
     purchase  and  to  lease any or all of the  Aircraft,  and  all
     rights  pertaining  thereto pursuant to this Agreement,  and/or
     may sell any of the Aircraft or assign the leases of any of the
     Aircraft,  to xxxxxx Any of such assignees will be entitled  to
     all  individual Aircraft benefits and obligations as  contained
     in  this  Agreement including all Letter Agreements, and  Buyer
     shall  have  no  further claim with respect  to  such  assigned
     benefits  and  obligations.  xxxxxx, the assignability  or  the
     extent  thereof of any Aircraft fleet benefits and  obligations
     or  total transaction concessions provided to Buyer pursuant to
     the Agreement, will be mutually agreed by the parties on a case
     by case basis.

5.0  In  the  event  of the termination of the Agreement,  this
     Letter Agreement shall become automatically null and  void
     with respect to any undelivered Aircraft.

6.0  The  provisions of this Letter Agreement are  personal  to
     Buyer  and shall not be assigned or otherwise disposed  of
     by Buyer without the prior written consent of Bombardier.

Yours very truly,

BOMBARDIER INC.
H. Anne Woodyatt
Director, Contracts

Acknowledged and Accepted

Atlantic Coast Airlines

Kerry B. Skeen
President & C.E.O.



July 29, 1999
Atlantic Coast Airlines
515A Shaw Road,
Sterling, Virginia,
U.S.A. 20166

Gentlemen,

x    Letter Agreement No. 004 to Purchase Agreement No. PA-0454
     dated July 29, 1999 (the "Agreement") between Bombardier Inc.
     ("Bombardier") and Atlantic Coast Airlines ("Buyer") relating
     to the purchase of thirty-six (36) Canadair Regional Jet
     Aircraft (the "Aircraft")

Subject:       Financing

1.0  This letter constitutes an integral part of the Agreement and
     evidences our further agreement with the matters set forth
     below.  All terms used herein and in the Agreement and not
     defined herein, shall have the same meaning as in the
     Agreement.

     1.1   This  Letter  Agreement describes the general  terms  and
     conditions  of  the  financing assistance  to  be  provided  by
     Bombardier to Buyer.  xxxxxx

2.3  xxxxxx

3.0  xxxxxx

x4.0 xxxxxx

5.0  In the event of the termination of the Agreement pursuant to
     Article 16.1 or 16.2 as a result of a default or breach of this
     Agreement by Buyer, this Letter Agreement shall become
     automatically null and void with respect to any undelivered
     Aircraft.

6.0  The provisions of this Letter Agreement are personal to Buyer
     and shall not be assigned or otherwise disposed of by Buyer
     except as part of an assignment of the Agreement expressly
     permitted by Article 20 of the Agreement.

     xxxxxx

5.0  The  provisions of this Letter Agreement are  personal  to
     Buyer  and shall not be assigned or otherwise disposed  of
     by  Buyer except as part of an assignment of the Agreement
     expressly permitted by Article 20 of the Agreement.

6.0  This Letter Agreement constitutes an integral part of  the
     Agreement   and  subject  to  the  terms  and   conditions
     contained therein.

x   7.0    In  the  event of the Termination of the  Agreement,
     this Letter Agreement shall become automatically null  and
     void with respect to undelivered Aircraft.


Attachment No. 9 to C.C.O. No. 2 dated August 2, 2000
Letter Agreement 006
Spares Credit

xx  3.0   In consideration of Buyer having entered into the above
     referenced Agreement, Bombardier will issue to Buyer, upon
     delivery and payment of the price of each of the Aircraft in
     accordance with the Agreement, a xxxxxx credit memorandum in
     the amount of xxxxxx (the "Additional xxxxxx Credit
     Memorandum").  No adjustment in the Credit Memorandum as
     identified in Letter Agreement No. 1 will be made in exchange
     for the issuance of this Additional xxxxxx Credit Memorandum.
     xxxxxx

x   4.0   The provisions of this Letter Agreement are personal to
     Buyer and shall not be assigned or otherwise disposed of by
     Buyer except as part of an assignment of the Agreement
     expressly permitted in Article 20 of the Agreement.

x   5.0   This Letter Agreement constitutes an integral part of the
     Agreement and subject to the terms and conditions contained
     therein.

x   6.0   In the event of the Termination of the Agreement, this
     Letter Agreement shall become automatically null and void with
     respect to any undelivered Aircraft.


Should there be any inconsistency between this Letter Agreement and
the Agreement with respect to the subject matter covered by the
terms hereof, then this Letter Agreement shall prevail.

Yours very truly,
BOMBARDIER INC.


________________________                Date:_____________
Michel Bourgeois
Vice President, Contracts

Acknowledged and Accepted

Atlantic Coast Airlines


________________________                Date:_____________
Kerry B. Skeen
President & C.E.O.


Attachment No. 10 to C.C.O. No. 2 dated August 2, 2000
Letter Agreement 009
Reconciliation

x    xxxxxx

x3.0 xxxxxx

4.0  This  letter  constitutes an integral part of the  Agreement  and
     evidences  our  further  agreement with  the  matters  set  forth
     below.   All  terms  used  herein and in the  Agreement  and  not
     defined herein, shall have the same meaning as in the Agreement.

5.0  The  provisions  of this Letter Agreement are personal  to  Buyer
     and  shall  not  be assigned or otherwise disposed  of  by  Buyer
     except  as  part of an assignment of the Agreement (in whole  not
     in  part)  expressly permitted under Article 20 of the  Agreement
     and otherwise such consent shall not be unreasonably withheld.

6.0  In  the  event of the Termination of the Agreement,  this  Letter
     Agreement  shall become automatically null and void with  respect
     to any undelivered Aircraft.

August 02, 2000

Atlantic Coast Airlines
515A Shaw Road,
Sterling, Virginia,
U.S.A. 20166

Gentlemen,

Letter Agreement No. 012 to Purchase Agreement No. PA-0454 dated
July 29, 1999 (the "Agreement"), as amended, between Bombardier Inc.
("Bombardier") and Atlantic Coast Airlines ("Buyer") relating to the
purchase of thirty-six (36) Canadair Regional Jet Aircraft (the
"Aircraft")

Subject:       Additional Option Aircraft

1.0  This letter constitutes an integral part of the Agreement and
     evidences our further agreement with the matters set forth
     below.  All terms used herein and in the Agreement and not
     defined herein, shall have the same meaning as in the
     Agreement.

2.0  In consideration of Buyer having entered into the above
     referenced Agreement, Bombardier will grant to Buyer the right
     to purchase forty (40) Aircraft (the "Option Aircraft") in
     accordance with the following general conditions:

     (a)  Number of Option Aircraft

          The  Scheduled Delivery Dates of the Option  Aircraft  are
          follows:

          xxxxxx

N.B. Notwithstanding the Delivery Schedule, as amended, prior to CCO
No.  2  becoming  a  firm  agreement for the  Conditional  Aircraft,
Bombardier  agrees  to  provide xxxxxx delivery  positions  for  the
Option  Aircraft  in  xxxxxxx,with  a  corresponding  reduction   in
delivery   positions   for  the  Option  Aircraft   xxxxxx   and   a
corresponding  advancement  of  xxxxxxx  Option  Aircraft   delivery
positions.

     (b)  Terms

(i)        The Option Aircraft will be as described in Article 2
           of the Agreement.

(ii) (a)   The  base price for each of the Option Aircraft
           (excluding  the Buyer Selected Optional Features)  Ex
           Works   (Incoterms  1990)  Bombardier's  offices   or
           premises in Montreal, Province of Quebec, Canada,  is
           xxxxxx

     (b)   The  base price of the Buyer Selected  Optional
           Features is xxxxxx

           The  Option  Aircraft base price shall  be  the  base
           price  for the Option Aircraft as stated in paragraph
           (b)(ii)(a)  above, plus the base price of  the  Buyer
           Selected  Optional  Features as stated  in  paragraph
           (b)(ii)(b) above (the "Option Aircraft Base Price").
           The   price  of  the  Option  Aircraft  (the  "Option
           Aircraft   Purchase  Price")  shall  be  the   Option
           Aircraft Base Price adjusted to xxxxxx

(iii)      As  consideration for this option, Buyer  shall
           make  or  cause to make payment to Bombardier  xxxxxx
           per  Option  Aircraft  (the  "Option  Deposit")  upon
           execution of CCO No. 2, for a total amount of  xxxxxx
           The amount of xxxxxx.

(iv)       Unless  expressly provided for in the Agreement,  the
           terms  and  conditions  of the  Agreement  (including
           Letter Agreements, except as noted below) shall apply
           mutatis  mutandis  to the Option Aircraft,  with  the
           exception that the provisions with respect to Annex A
           training courses as specified in Article 3.2.4 of the
           Agreement (Flight Attendant Courses), shall not apply
           to the Option Aircraft.

(v)        The following Letter Agreement shall not apply to the
           Option Aircraft and is hereby excluded:

        Letter  Agreement  No.  012  (Additional  Option Aircraft)

(vi)       Letter Agreement No. 008A (Schedule Completion Rate),
           Letter    Agreement   No.   009E   (Airframe   Direct
           Maintenance  Cost)  and  Letter  Agreement  No.   006
           (Operational Restrictions) of purchase agreement  no.
           RJ-0350 dated January 8, 1997, as amended through CCO
           No.  17  to  such  purchase  agreement,  shall  apply
           mutatis   mutandis  to  the  Option  Aircraft,   with
           specific  terms  for  Option  Aircraft  as  set   out
           therein.

(vii)      Option Aircraft will receive pricing and credit memoranda
           as provided for the Aircraft, including the credit memoranda
           specified in paragraph 2.0 of Letter Agreement No. 001B
           (Credit Memoranda), and the Additional xxxxxx Credit
           Memorandum specified in paragraph 3.0 of Letter Agreement
           006 (Spares Credit).

     (c)  Option Aircraft Payment Terms

          Terms of payment for each of the Option Aircraft shall  be
          as  set  forth  for  the Aircraft in Article  5.2  of  the
          Agreement as amended by CCO No. 2 (and attached thereto as
          Attachment 1) with the exception that the xxxxxx  payments
          required  pursuant  to  Article 5.2.3  (a)  and  (b)  with
          respect  to the firm Aircraft shall be paid by  Buyer  for
          each  of the Option Aircraft xxxxxx the Scheduled Delivery
          Date of the applicable Aircraft .

     (d)  Exercise Procedures

          Timing  and procedures for the exercise of Option Aircraft
          shall be as follows:

(i)       The Option Aircraft will be exercised as individual aircraft,
          with Buyer providing written notice of its intention to do so
          ("Notice of Intention") xxxxxx the first day of the month of
          the Scheduled Delivery Date of the applicable Option Aircraft,
          at which point the Option Deposit for the applicable Option
          Aircraft will become non-refundable, and a definitive
          irrevocable, written exercise xxxxxx the first day of the month
          of the Scheduled Delivery Date of the applicable Option Aircraft.

(ii)      Additional Option Aircraft.  Upon receipt of  Buyer's
          definitive irrevocable written exercise of any Option
          Aircraft  or  Buyer's failure to exercise  an  Option
          Aircraft at the required time, Buyer shall be granted
          a right to purchase an additional Option Aircraft (an
          "Additional  Option Aircraft"), the xxxxxx  of  which
          will  have  delivery positions at the rate of  xxxxxx
          commencing  in the xxxxxx of the Option Aircraft,  as
          may  have  been adjusted.  The subsequent  Additional
          Option  Aircraft will have delivery positions  to  be
          provided by Bombardier subject to availability taking
          into  account Bombardier's then production  rate  and
          commitments.   The   terms  and  conditions  for  the
          Additional Option Aircraft will be the same as  those
          for   the   Option   Aircraft  with   the   following
          exceptions:  xxxxxx

3.0  Bombardier will, upon payment for and delivery of each Option
     Aircraft, xxxxxx, extend the term of Article 1.2.2 of Annex A
     of the Agreement (the Field Service Representative ("FSR")) by
     xxxxxx.

4.0  In the event of the Termination of the Agreement, this Letter
     Agreement shall become automatically null and void.

5.0  Upon exercise of Buyer's rights to purchase in accordance with
     this Letter Agreement, the parties shall amend the Agreement or
     enter into an additional purchase agreement in order to give
     effect to the purchase of Option Aircraft or Additional Option
     Aircraft in accordance with the terms and conditions hereof.

7.0  The provisions of this Letter Agreement are personal to Buyer
     and, except as part of an assignment of the Agreement as
     expressly permitted by the provisions in Article 20 of the
     Agreement, shall not be assigned or otherwise disposed of by
     Buyer without the prior written consent of Bombardier.

Should there be any inconsistency between this Letter Agreement and
the Agreement with respect to the subject matter covered by the
terms hereof, then this Letter Agreement shall prevail.

Yours truly,

BOMBARDIER INC.
________________________                Date:_____________

H. Anne Woodyatt
Director, Contracts
Acknowledged and Accepted

ATLANTIC COAST AIRLINES
________________________                Date:_____________
Kerry B. Skeen
President and C.E.O.

                        CONTRACT CHANGE ORDER



PURCHASER:              Atlantic Coast Airlines

PURCHASE AGREEMENT NO.: PA-0454 (the "Agreement") AIRCRAFT TYPE: CRJ

C.C.O. NO.:             3                         DATED:
December 6, 2000

PAGES:                  8


REASON FOR CHANGE

To amend the Agreement to provide Buyer with a revised Option
Aircraft delivery schedule and a new rate for delivery of the
Additional Option Aircraft.

PAGES TO BE SUBSTITUTED             NEW/REVISED PAGES

Letter Agreement No. 012A           Attachment No. 1 to CCO No. 3


DESCRIPTION OF CHANGE:

Letter Agreement No. 012A - (Additional Option Aircraft)

Letter Agreement No. 012 is hereby deleted and replaced in its
entirety by Letter Agreement No.012A to  (i) provide Buyer with a
revised Option Aircraft delivery schedule for the forty (40) Option
Aircraft by adding xxxxxx, (ii) xxxxxx, and (iii) xxxxxx

EXCEPT AS SET FORTH ABOVE OR IN THE ATTACHMENTS HERETO, ALL OTHER
TERMS AND CONDITIONS OF THE AGREEMENT WILL REMAIN UNCHANGED

FOR AND ON BEHALF OF:                FOR AND ON BEHALF OF:

Bombardier Inc.                      Atlantic Coast Airlines
Bombardier Aerospace
Regional Aircraft



Signed:  "Scott Preece"              Signed:  "Richard Kennedy"
Scott Preece                         Name:     Richard Kennedy
Manager, Contracts                   Title:    Vice President,
                                               General Counsel &
                                                Secretary

Date:     December 6, 2000           Date:    December 6, 2000




December 6, 2000
Atlantic Coast Airlines
515A Shaw Road,
Sterling, Virginia,
U.S.A. 20166

Gentlemen,

Letter Agreement No. 012A to Purchase Agreement No. PA-0454 dated
July 29, 1999 (the "Agreement"), as amended, between Bombardier Inc.
("Bombardier") and Atlantic Coast Airlines ("Buyer") relating to the
purchase of thirty-six (36) Canadair Regional Jet Aircraft (the
"Aircraft")

This Letter Agreement No. 012A dated December 6, 2000 cancels and
supersedes Letter Agreement No. 012 dated August 2, 2000.

Subject:       Additional Option Aircraft

1.0  This letter constitutes an integral part of the Agreement and
     evidences our further agreement with the matters set forth
     below.  All terms used herein and in the Agreement and not
     defined herein, shall have the same meaning as in the
     Agreement.

2.0  In consideration of Buyer having entered into the above
     referenced Agreement, Bombardier will grant to Buyer the right
     to purchase forty (40) additional Aircraft (the "Option
     Aircraft") in accordance with the following general conditions:

     (a)  Number of Option Aircraft

          The  Scheduled Delivery Dates of the Option  Aircraft  are
          follows:

          xxxxxx

     (b)  Terms

        (i)  The Option Aircraft will be as described in Article 2
             of the Agreement.

       (ii)  (a)   The  base price for each of the Option Aircraft
             (excluding  the Buyer Selected Optional Features)  Ex
             Works   (Incoterms  1990)  Bombardier's  offices   or
             premises in Montreal, Province of Quebec, Canada,  is
             xxxxxx .

             (b)   The  base  price of the Buyer Selected  Optional
             Features is xxxxxx

             The  Option  Aircraft base price shall  be  the  base
             price  for the Option Aircraft as stated in paragraph
             (b)(ii)(a)  above, plus the base price of  the  Buyer
             Selected  Optional  Features as stated  in  paragraph
             (b)(ii)(b) above (the "Option Aircraft Base Price").

             The   price  of  the  Option  Aircraft  (the  "Option
             Aircraft   Purchase  Price")  shall  be  the   Option
             Aircraft Base Price adjusted to xxxxxx

      (iii)  As  consideration for this option, Buyer  shall
             make  or  cause to make payment to Bombardier  xxxxxx
             per  Option  Aircraft  (the  "Option  Deposit")  upon
             execution of CCO NO. 2, for a total amount of xxxxxx.
             The amount of xxxxxx

       (iv)  Unless  expressly provided for in the Agreement,  the
             terms  and  conditions  of the  Agreement  (including
             Letter Agreements, except as noted below) shall apply
             mutatis  mutandis  to the Option Aircraft,  with  the
             exception that the provisions with respect to Annex A
             training courses as specified in Article 3.2.4 of the
             Agreement (Flight Attendant Courses), shall not apply
             to the Option Aircraft.

        (v)  The following Letter Agreement shall not apply to the
             Option Aircraft and is hereby excluded:

             Letter Agreement No. 012 (Additional  Option Aircraft)

       (vi)  Letter Agreement No. 008A (Schedule Completion Rate),
             Letter    Agreement   No.   009E   (Airframe   Direct
             Maintenance  Cost)  and  Letter  Agreement  No.   006
             (Operational Restrictions) of purchase agreement  no.
             RJ-0350 dated January 8, 1997, as amended through CCO
             No.  17  to  such  purchase  agreement,  shall  apply
             mutatis   mutandis  to  the  Option  Aircraft,   with
             specific  terms  for  Option  Aircraft  as  set   out
             therein.

     (viii)  Option Aircraft will receive pricing and credit memoranda
             as provided for the Aircraft, including the credit
             memoranda specified in paragraph 2.0 of Letter Agreement
             No. 001B (Credit Memoranda), and the Additional xxxxxx
             Credit Memorandum specified in paragraph 3.0 of Letter
             Agreement 006 (Spares Credit).

     (c)  Option Aircraft Payment Terms

          Terms of payment for each of the Option Aircraft shall  be
          as  set  forth  for  the Aircraft in Article  5.2  of  the
          Agreement as amended by CCO No. 2 (and attached thereto as
          Attachment 1) with the exception that the xxxxxx  payments
          required  pursuant  to  Article 5.2.3  (a)  and  (b)  with
          respect  to the firm Aircraft shall be paid by  Buyer  for
          each  of the Option Aircraft xxxxxx the Scheduled Delivery
          Date of the applicable Aircraft .

     (d)  Exercise Procedures

          Timing  and procedures for the exercise of Option Aircraft
          shall be as follows:

          (ii) The Option Aircraft will be exercised as individual
          aircraft, with Buyer providing written notice of its
          intention to do so ("Notice of Intention") xxxxxx the first
          day of the month of the Scheduled Delivery Date of the
          applicable Option Aircraft, at which point the Option Deposit
          for the applicable Option Aircraft will become non-refundable,
          and a definitive irrevocable, written exercise xxxxxx the
          first day of the month of the Scheduled Delivery Date of the
          applicable Option Aircraft.

          (ii) Additional Option Aircraft.  Upon receipt of  Buyer's
               definitive irrevocable written exercise of any Option
               Aircraft  or  Buyer's failure to exercise  an  Option
               Aircraft at the required time, Buyer shall be granted
               a right to purchase an additional Option Aircraft (an
               "Additional Option Aircraft"), xxxxxx of  which  will
               have  delivery positions commencing in the xxxxx  The
               subsequent  Additional  Option  Aircraft  will   have
               delivery  positions  to  be  provided  by  Bombardier
               subject   to   availability   taking   into   account
               Bombardier's  then production rate  and  commitments.
               The   terms and conditions for the Additional  Option
               Aircraft  will  be the same as those for  the  Option
               Aircraft with the following exceptions:  xxxxxx

3.0  Bombardier will, upon payment for and delivery of each Option
     Aircraft, xxxxxx, extend the term of Article 1.2.2 of Annex A
     of the Agreement (the Field Service Representative ("FSR")) by
     xxxxxx

4.0  In the event of the Termination of the Agreement, this Letter
     Agreement shall become automatically null and void.

5.0  Upon exercise of Buyer's rights to purchase in accordance with
     this Letter Agreement, the parties shall amend the Agreement or
     enter into an additional purchase agreement in order to give
     effect to the purchase of Option Aircraft or Additional Option
     Aircraft in accordance with the terms and conditions hereof.

6.0  The provisions of this Letter Agreement are personal to Buyer
     and, except as part of an assignment of the Agreement as
     expressly permitted by the provisions in Article 20 of the
     Agreement, shall not be assigned or otherwise disposed of by
     Buyer without the prior written consent of Bombardier.

Should there be any inconsistency between this Letter Agreement and
the Agreement with respect to the subject matter covered by the
terms hereof, then this Letter Agreement shall prevail.

Yours truly,
BOMBARDIER INC.
"Scott Preece"                               Date: December 6, 2000
Scott Preece
Manager, Contracts

Acknowledged and Accepted
ATLANTIC COAST AIRLINES
"Richard Kennedy"                            Date: December 6, 2000
Name: Richard Kennedy
Title:  Vice President, General Counsel and Secretary


                        CONTRACT CHANGE ORDER



PURCHASER:              Atlantic Coast Airlines

PURCHASE AGREEMENT NO.: PA-0454 (the "Agreement") AIRCRAFT TYPE: CRJ

C.C.O. NO.:             4                      DATED: November 7, 2001

PAGES:                  3

REASON FOR CHANGE:

To amend the Agreement to (i) add Paint Scheme - ACA - United
Express, G1 Galley - Stowable Work Shelf, and FMS - Single, ACARS
Compatible (Collins FMS-4200) to the list of Buyer Selected Optional
Features, and (ii) delete Paint Scheme and FMS - Single Collins FMS
4200 from the list of Buyer Selected Optional Features.


PAGES TO BE SUBSTITUTED:            NEW/REVISED PAGES:

Purchase Agreement, page 54         Attachment No. 1 to CCO No. 4


DESCRIPTION OF CHANGE:

P.A., page 54 - Appendix IV (Buyer Selected Optional Features)

The Buyer Selected Optional Features are amended by: (i) deleting CR
Ref. N 11-300 (Paint Scheme) and replacing it with CR Ref. N 25-060
(Paint Scheme - ACA - United Express) xxxxxx, (ii) replacing CR Ref.
N 25-31-320 with CR Ref. N 25-31-301, (iii) adding CR Ref. N 25-31-
306 (G1 Galley - Stowable Work Shelf) xxxxxx, and (iv) deleting CR
Ref. N 34-330 (FMS - Single Collins FMS-4200) and replacing it with
CR Ref. N 34-335 (FMS - Single, ACARS Compatible (Collins FMS-4200))
xxxxxx.

   EXCEPT AS SET FORTH ABOVE OR IN THE ATTACHMENTS HERETO, ALL
   OTHER TERMS AND CONDITIONS OF THE AGREEMENT WILL REMAIN
   UNCHANGED

FOR AND ON BEHALF OF:                  FOR AND ON BEHALF OF:

Bombardier Inc.                        Atlantic Coast Airlines
Bombardier Aerospace
Regional Aircraft

Signed:  "Scott Preece"                Signed:  "Richard Kennedy"
     Scott Preece                           Name: Richard J.
     Kennedy
     Manager, Contracts                     Title: Vice President
                                                    and Secretary

Date:     November 7, 2001                  Date:  November 15, 2001

                             APPENDIX IV

                  BUYER SELECTED OPTIONAL FEATURES


CS :
A7553 Bx                Option Description                 Price in
CR Ref. N                                                  Jan 1999
                                                              US
                                                            Dollars
                                                       
00-008     PERFORMANCE - EXTENDED RANGE                      xxxxxx
00-312     ADDITIONAL FLAP SETTING, 8 DEG TAKE-OFF           xxxxxx
00-313     CERTIFICATION - FAA STRAPPING                     xxxxxx
25-060     PAINT SCHEME - ACA - UNITED EXPRESS xx            xxxxxx
x
25-22-301  IN-ARM MEAL TRAYS IN ROW 1                        xxxxxx
25-22-302  UNDERSEAT LIFE VEST POUCHES                       xxxxxx
25-22-304  RECLINING PASSENGER SEATS                         xxxxxx
25-24-301  ENTRANCE STORAGE COMPARTMENT                      xxxxxx
25-26-301  PARTITION - LHD WINDSCREEN                        xxxxxx
25-26-302  PARTITION - RHD WINDSCREEN                        xxxxxx
25-31-301  G1 GALLEY: PROVISIONS FOR SNACK & HOT             xxxxxx
x          BEVERAGE SERVICE
25-31-306  G1 GALLEY - STOWABLE WORK SHELF                   xxxxxx
xxx
25-34-310  STANDARD BEVERAGE MAKER - COFFEE (QTY 2)          xxxxxx
30-001     ICE DETECTION - RED WARNING LIGHT                 xxxxxx
31-320     EICAS 2000                                        xxxxxx
31-340     DFDR 88 PARAMETERS                                xxxxxx
33-003     RED BEACON LIGHTS                                 xxxxxx
33-310     TAIL LOGO LIGHTS                                  xxxxxx
33-320     CARGO DOOR FLOODLIGHTS                            xxxxxx
34-328     EGPWS - ENHANCED GROUND PROXIMITY WARNING         xxxxxx
           SYSTEM
34-335    FMS - SINGLE, ACARS COMPATIBLE (COLLINS FMS-      xxxxxx
x         4200)
34-350    GPS - SINGLE COLLINS GPS-4000                     xxxxxx
34-353    VHF NAV - FM IMMUNITY (VIR-432+)                  xxxxxx
34-362    ALTIMETER - BARO SETTING REMINDER                 xxxxxx
35-004    EROS MAGIC MASK (THREE)                           xxxxxx
38-313    8 US GAL. GALLEY WATER/WASTE TANK SYSTEM          xxxxxx
         (WITH G1 GALLEY SELECTION)
          AMI PILOT & CO-PILOT SEAT                         xxxxxx
                               Total Technical Features     xxxxxx
xxxxx

 All  prices  listed above are expressed in January  1,
 1999   US   dollars,  and  are  subject  to   economic
 adjustment  to  the  date  of  aircraft  delivery   as
 provided in the Agreement.



                        CONTRACT CHANGE ORDER



PURCHASER:                Atlantic Coast Airlines

PURCHASE AGREEMENT NO.:   PA-0454 (the "Agreement") AIRCRAFT TYPE:
CRJ-200
                                              
C.C.O. NO.:               5                         DATED:
December 20, 2001

PAGES:                    15

REASON FOR CHANGE

To amend the Agreement by (i) revising the Delivery Schedule and
(ii) introducing Letter Agreement No. 013 to provide amended terms
and conditions relating to the xxxxxx built aircraft bearing
manufacturer serial numbers xxxxxx and xxxxx being the  xxxxxx to be
delivered under the Agreement (the "Built Aircraft") which are
referenced in the proposal letter dated December 20, 2001 executed
by Buyer and Bombardier.


PAGES TO BE SUBSTITUTED                 NEW/REVISED PAGES
                                     
Purchase Agreement page 52              Attachment No. 1 to CCO No. 5
Purchase Agreement pages C-23 and C-24  Attachment No. 2 to CCO No. 5
Letter Agreement No. 013                Attachment No. 3 to CCO No. 5


DESCRIPTION OF CHANGE:

P.A. Page 52 - Appendix II (Delivery Schedule)

Appendix II (Delivery Schedule) is deleted in its entirety and
   replaced by Attachment No. 1 hereto.

P.A. Pages C-23 and C-24 - Attachment A (List of Technical Data,
Column Heading Explanation of Codes and Technical Data)

The definition of ATD found in Item 6 is amended by deleting the
word "first" and replacing it with the word "second".   In addition,
the definition of PTD found in Item 6 is amended by deleting the
words "each or the first" and replacing them with the words "the
second or each subsequent".

The last sentence on page C-23 is amended by deleting the word
"first" from the first line and replacing it with the word "second".
Note 1: A. is amended by deleting the word "first" from the second
   line and replacing with the word "second".

Letter Agreement No. 013 - (Built Aircraft)

Letter Agreement No. 013 is introduced to provide amended terms and
conditions relating to the Built Aircraft and is set forth in
Attachment No. 2 hereto.

This CCO No. 5 is conditional upon Buyer executing CCO No. 19 to
Purchase Agreement No. 0350 failing which this CCO shall become null
and void.

EXCEPT AS SET FORTH ABOVE OR IN THE ATTACHMENTS HERETO, ALL OTHER
TERMS AND CONDITIONS OF THE AGREEMENT WILL REMAIN UNCHANGED

FOR AND ON BEHALF OF:                   FOR AND ON BEHALF OF:

Bombardier Inc.                         Atlantic Coast Airlines
Bombardier Aerospace
Regional Aircraft

Signed:  "Scott Preece"                 Signed: "Rick Kennedy"

Date:  December 20, 2001                Date:  December 21, 2001



                                   APPENDIX II


                          DELIVERY SCHEDULE
                            
   First Aircraft              xxxxxx
   Second Aircraft             xxxxxx
   Third Aircraft              xxxxxx
   Fourth Aircraft             xxxxxx
   Fifth Aircraft              xxxxxx
   Sixth Aircraft              xxxxxx
   Seventh Aircraft            xxxxxx
   Eighth Aircraft             xxxxxx
   Ninth Aircraft              xxxxxx
   Tenth Aircraft              xxxxxx
   Eleventh Aircraft           xxxxxx
   Twelfth Aircraft            xxxxxx
   Thirteenth Aircraft         xxxxxx
   Fourteenth Aircraft         xxxxxx
   Fifteenth Aircraft          xxxxxx
   Sixteenth Aircraft          xxxxxx
   Seventeenth Aircraft        xxxxxx
   Eighteenth Aircraft         xxxxxx
   Nineteenth Aircraft         xxxxxx
   Twentieth Aircraft          xxxxxx
   Twenty-first Aircraft       xxxxxx
   Twenty-second Aircraft      xxxxxx
   Twenty-third Aircraft       xxxxxx
   Twenty-fourth Aircraft      xxxxxx
   Twenty-fifth Aircraft       xxxxxx
   Twenty-sixth Aircraft       xxxxxx
   Twenty-seventh Aircraft     xxxxxx
   Twenty-eighth Aircraft      xxxxxx
   Twenty-ninth Aircraft       xxxxxx
   Thirtieth Aircraft          xxxxxx
   Thirty-first Aircraft       xxxxxx
   Thirty-second Aircraft      xxxxxx
   Thirty-third Aircraft       xxxxxx
   Thirty-fourth Aircraft      xxxxxx
   Thirty-fifth Aircraft       xxxxxx
   Thirty-sixth Aircraft       xxxxxx


                            ATTACHMENT A
                       LIST OF TECHNICAL DATA
                 COLUMN HEADING EXPLANATION OF CODES


ITEM
    
1      DOC  DOCUMENT
       Title of Technical Data provided.

2      CONFIG    CONFIGURATION
       G = Contains data common to all aircraft of the same type
           (Generic).
       C = Contains data unique to Buyer's Aircraft (Customized).

3      MEDIUM   Buyer selects one of the following media specified
                in the table:
                    1    =    Print two sides
                    2    =    Microfilm
                    3    =    Print one side
                    4    =    Laminated Cardboard

4      REVISION     Y     =   Periodic revision service applies
                    N     =   Revision service not applicable
                    S     =   Revised as required by Bombardier

5      QUANTITY
             (Number)     =   Quantity per the Agreement
             (Number) PER =   Quantity per Aircraft

6      DELIVERY
x                   ATD   =   At time of the Delivery Date of the
                              second Aircraft.
x                   PTD   =   Prior to the Delivery Date of the
                              second or each subsequent Aircraft
                              (as applicable).

7      ATA          Y     =   Document is per ATA Specification 100,
                              Revision 26.
                    N     =   Document is to Bombardier's existing
                              commercial practices.

x  With the delivery of the second Aircraft, Bombardier will
provide to Buyer at no additional charge one set of the
technical manuals listed below

                           TECHNICAL DATA
                            REGIONAL JET


ITEM            DOC              CONF MEDIUM QTY  REV  DEL ATA REMARKS
                                       
1.  AIRCRAFT MAINTENANCE MANUAL    G   1,2  xxxxxx Y   PTD  Y
    (AMM)
2.  ILLUSTRATED PARTS              G   1,2  xxxxxx Y   PTD  Y
    MANUAL/CATALOG (IPC)
3.  STRUCTURAL REPAIR MANUAL       G   1,2  xxxxxx Y   PTD  Y
    (SRM)
4.  COMPONENT MAINTENANCE MANUAL   G   1,2  xxxxxx Y   PTD  Y
    (CMM)
5.  POWER PLANT BUILD-UP MANUAL    G   1,2  xxxxxx Y   PTD  Y
6.  WIRING DIAGRAM MANUAL          C   1,2  xxxxxx Y   PTD  Y
7.  ILLUSTRATED TOOL & EQUIPMENT   G   1,2  xxxxxx Y   PTD  Y
    MANUAL (ITEM)
8.  SERVICE BULLETINS              G   1    xxxxxx S   PTD  Y  SEE NOTE 2
9.  NON DESTRUCTIVE TEST MANUAL    G   1    xxxxxx Y   PTD  Y
10. MAINTENANCE PROGRAM DOCUMENT   G   1    xxxxxx S   PTD  Y  SEE NOTE 3
    (MPD)
11. FAA OR DOT AIRPLANE FLIGHT     C   1    xxxxxx S   ATD  N
    MANUAL (AFM)
12. WEIGHT & BALANCE MANUAL        G   1    xxxxxx Y   ATD  Y
13. MASTER MINIMUM EQUIPMENT LIST  G   1    xxxxxx S   ASAP N
    (MMEL)
14. QUICK REFERENCE HANDBOOK       C   1    xxxxxx S   ATD  N
15. FLIGHT CREW OPERATING MANUAL   C   1    xxxxxx S   ATD  N  SEE NOTE 1
    (FCOM)
16. MAINTENANCE TASK CARDS         C   3    xxxxxx S   PTD  N
17. ACCESS PANELS AND              G   1    xxxxxx N   PTD  N
    DOORS/COMPONENT LOCATION
    MANUAL
18. FLIGHT PLANNING & CRUISE       G   1    xxxxxx S   ASAP N
    CONTROL MANUAL
19. AIRCRAFT CHARACTERISTICS FOR   G   1    xxxxxx N   ASAP N  SEE NOTE 4
    AIRPORT PLANNING
20. ON-BOARD WIRING DIAGRAM BOOK   C   3    xxxxxx N   ATD  N  SEE NOTE 5
21. MAINTENANCE FACILITIES &       G   1    xxxxxx S   ASAP N
    EQUIPMENT PLANNING MANUAL
22. SYSTEM SCHEMATIC MANUAL (SSM)  G   1,2  xxxxxx Y   ATD  Y  SEE NOTE 1
23. PASSENGER INFORMATION SHEET    G   3    xxxxxx S   ATD  N  SEE NOTE 6
24. PILOT CHECKLIST                C   4    xxxxxx S   ATD  N
25. CRASH CREW CHART               G   4    xxxxxx S   ATD  N
26. DISPATCH DEVIATION GUIDE       G   1    xxxxxx S   PTD  N


NOTE 1:REVISION SERVICE
x     A.  Revision services shall be available without charge
          for  xxxxxx  following the Delivery Date of Buyer's
          second Aircraft. Subsequent revision service  shall
          be   provided   dependent   upon  incorporation  of
          Bombardier issued Service Bulletins.

      B.  Revisions  to  the  Technical  Data  to  reflect  the
          Aircraft at Delivery Date shall be provided to  Buyer
          within six (6) months following the Delivery Date  of
          each of the Aircraft, respectively.

      C.  Provided the revision service is being supplied under
          the terms of this Agreement or by subsequent purchase
          order, Bombardier shall incorporate in the applicable
          documents   all   applicable  Bombardier   originated
          Service  Bulletins  in a regular  revision  following
          formal   notification  by  Buyer  that  such  Service
          Bulletins  shall  be  accomplished  on  the   Buyer's
          Aircraft.   The  manuals  shall  then  contain   both
          original   and  revised  configuration  until   Buyer
          advises  Bombardier in writing that one configuration
          is no longer required.

December 20, 2001

Atlantic Coast Airlines
45200 Business Court S.100,
Dulles, Virginia,
U.S.A. 20166

Gentlemen,

Letter  Agreement  No. 013 to Purchase Agreement No.  PA-0454  dated
July 29, 1999 (the "Agreement"), as amended, between Bombardier Inc.
("Bombardier") and Atlantic Coast Airlines ("Buyer") relating to the
purchase  of  thirty-six (36) Canadair Regional  Jet  Aircraft  (the
"Aircraft")

Subject:       Built Aircraft

1.0  This  letter constitutes an integral part of the Agreement  and
     evidences  our  further agreement with the  matters  set  forth
     below.   All  terms  used herein and in the Agreement  and  not
     defined  herein,  shall  have  the  same  meaning  as  in   the
     Agreement.

2.0  In  consideration  of  Buyer  having  entered  into  the  above
     referenced  Agreement,  and further  to  Buyer  and  Bombardier
     executing  the  proposal letter dated December 20,  2001  which
     includes  the  replacement  of xxxxxx  built  aircraft  bearing
     manufacturer serial numbers xxxxxxand xxxxxx ("Built Aircraft")
     for  xxxxxx Aircraft under the Agreement, these Built  Aircraft
     becoming the xxxxxx under the Agreement, the parties agree that
     the  terms and conditions of the Agreement shall apply  to  the
     Built Aircraft and all references to Aircraft shall include the
     Built  Aircraft, save and except for the amendments  set  forth
     below  which  shall  only  apply  with  respect  to  the  Built
     Aircraft:

     (i)  P.A. Page 8 - Article 2 (Subject Matter of Sale)

          The  first  paragraph  of  Article  2  is  amended  by  (i)
          deleting the words "xxxxxx dated xxxxxx attached hereto as
          Appendix  III"  from  the  third  and  fourth  lines   and
          replacing  them  with  the words  "xxxxxxx  dated  xxxxxx,
          attached to Contract Change Order No. 5 as Annex No. 1  to
          Attachment No. 1" and (ii) deleting the words "Appendix IV
          hereto" from the seventh line and replacing them with  the
          words  "Annex Nos. 2 and 3 to Attachment No. 1 to Contract
          Change Order No. 5 with respect to the First Aircraft  and
          Second Aircraft respectively".

          The   second  paragraph  shall  not  apply  to  the   Built
          Aircraft.

     (ii) P.A. Page 10 - Article 4 (Price)

          Article  4.1  (b)  is  amended by deleting  the  words  "is
          xxxxxx  " and replacing them with the words "for the xxxxxx
          is xxxxxx".

          Article 4.3.2 is amended by adding the words "and xxxxxx

          Article 4.3.3 is amended by adding the words xxxxxx

    (iii) P.A. Page 27 - Article 13 (Excusable Delay)

          Article 13.2 (b) is amended by adding the words xxxxxx

     (iv) P.A. Page 14.2 (Non-Excusable Delay)

          Article 14.2 is amended by adding the words xxxxxx

      (v) P.A. Page 53 - APPENDIX III  (Specification)

          Appendix III is deleted in its entirety and replaced by
          the following:


                         TYPE SPECIFICATION

                               xxxxxx

     (vi) P.A. Page 54 - APPENDIX IV (Buyer Selected Optional
          Features)

          Appendix IV is deleted in its entirety and replaced by
          Annex Nos. 2 and 3 hereto with respect to the xxxxxx.

    (vii) P.A.  Page  C-24 - ANNEX A (Technical  Data,  Regional
          Jet)

          Bombardier  will deliver to Buyer the FAA or  DOT  Airplane
          Flight  Manual,  Flight  Crew Operating  Manual  and  Quick
          Reference  Handbook at the time of delivery of  each  Built
          Aircraft  and the Illustrated Parts Manual/Catalog,  Wiring
          Diagram  Manual  and Weight & Balance Manual  as  completed
          for  the  original  intended  customer,  at  the  time   of
          respective Built Aircraft delivery. Bombardier will  update
          and  deliver  the revisions to the manuals via  the  normal
          revision  cycle.   The manuals will be revised  to  Buyer's
          original  Aircraft Specification at delivery  (RAD-601R-146
          Issue  B  dated  June 11, 1999 and Buyer Selected  Optional
          Features).   The above referenced manuals are  included  in
          the quantity referenced in the Technical Data set forth  in
          Annex A to the Agreement.

   (viii) P.A. Page C-31 - ANNEX B (Vendor Warranties)

          Article  2.2 is  amended by adding the  words  "and  shall
          commence from the date of delivery of the Built  Aircraft"
          at the end of the paragraph.

     (ix) Letter Agreement No. 001B - Credit Memoranda

          The title is amended by adding the words "and xxxxxx

          Article  2.0  of Letter Agreement No. 001B is  amended  by
          deleting  the  words  xxxxxx for each  Aircraft"  from  the
          xxxxxx  and  replacing them with the  words  "xxxxxfor  the
          xxxxxx".

          Article  4.0  and  5.0  are amended  by  renumbering  them
          Articles  5.0  and 6.0.  A new Article 4.0 is inserted  as
          follows:

4.0  In  consideration  of Buyer having entered  into  the  proposal
     letter dated December 20, 2001, Bombardier will issue to Buyer,
     upon delivery and payment of the price of the Built Aircraft in
     accordance  with  the  Agreement, a credit  memorandum  in  the
     amount of xxxxxx

     xxxxxx The credit memorandum, as adjusted, will collectively be
     known as the xxxxxx

     (x) Letter Agreement No. 006 - xxxxxx Credit

         Article 3.0 of Letter Agreement No. 006 shall not apply to
         the Built Aircraft.

    (xi) Letter Agreement No. 009 (Reconciliation)

         Article 3.0 is amended by adding the words "xxxxxx.

3.0  The  provisions of this Letter Agreement are personal to  Buyer
     and,  except  as  part  of an assignment of  the  Agreement  as
     expressly  permitted by the provisions in  Article  20  of  the
     Agreement,  shall not be assigned or otherwise disposed  of  by
     Buyer without the prior written consent of Bombardier.

4.0  In  the  event of the Termination of the Agreement, this Letter
     Agreement shall become automatically null and void.

Should there be any inconsistency between this Letter Agreement  and
the  Agreement  with respect to the subject matter  covered  by  the
terms hereof, then this Letter Agreement shall prevail.

Yours truly,
BOMBARDIER INC.

"Scott Preece"
Scott Preece                                 Date: December 20, 2001
Manager, Contracts

Acknowledged and Accepted

ATLANTIC COAST AIRLINES
"Rick Kennedy"
Name: Richard Kennedy                        Date: December 21, 2001
Title:  Vice President, General Counsel and Secretary


Annex No. 1 to Letter Agreement No. 013


                            SPECIFICATION

                         TYPE SPECIFICATION
                               xxxxxx


Annex No. 2 to Letter Agreement No. 013
                          APPENDIX IV

             BUYER SELECTED OPTIONAL FEATURES FOR
                        FIRST AIRCRAFT


CS:
ACA7553-B
CR Ref. N             Option Description             Price in
                                                        Jan
                                                      1999 US
                                                      Dollars
        
00-008     Performance - Extended Range
00-312     Additional Flap Setting, 8 Deg Take-Off
00-313     Certification - FAA Strapping
21-309     Ground Air Conditioning Connection
23-331     VHF Comm Third Radio Complete Provisions
23-350     Selcal System
25-083     Paint Scheme - Midway
25-22-301  In-Arm Meal Tables At Front Row
25-22-302  Underseat Life Vest Pouches
25-22-303  Leather Passenger Seat Dress Covers, 50
           Seats
25-22-304  Reclining Passenger Seats
25-23-301  Second Flight Attendant Fold-Down Seat
           (With Hand-Set / Intercom)
25-24-301  Entrance Storage Compartment
25-26-301  Partition - LHD Windscreen
25-26-302  Partition - RHD Windscreen
25-31-301  G1 Galley: Provisions For Snack And Hot
           Beverage Service (Prov. 2 Carts)
25-31-306  G1 Galley: Storable Work Shelf
25-320x    Interior Cabin - Midway
25-34-310  Atlas Standard Beverage Maker - Coffee
           (Qty 2)
25-61-3XX  Emergency Equipment - Midway - Type Spec
25-62-301  Third Oxygen Mask In Lhs Psu
30-001     Ice Detection - Red Warning Light
31-340     FDR - 128 WPS DFDR (L3Comm)
33-003     Red Beacon Lights
33-310     Tail Logo Flood Lights



             BUYER SELECTED OPTIONAL FEATURES FOR
                  FIRST AIRCRAFT - CONTINUED


CS:
ACA7553 B
CR Ref. N             Option Description             Price in
                                                        Jan
                                                      1999 US
                                                      Dollars
                                                
33-320     Cargo Door Floodlights
34-328     GPWS - Enhanced (Allied  Signal)
34-330     FMS - Single Collins FMS-4200
34-350     GPS - Single Collins GPS-4000
34-362     Altimeter - Baro Setting Reminder
34-390     FMS - On Board Data Loader
35-004     Eros Magic Mask (Three)
38-313     8 US Gal. Galley Water/Waste Tank System
           (With G1 Galley Selection)
                            Total Technical Features  xxxxxx

Notes:
x  Interior Cabin - Midway entails the following:
- - second flight attendant removed after CofA
- - second flight attendant intercom system remains
functional

                          APPENDIX IV

             BUYER SELECTED OPTIONAL FEATURES FOR
                        SECOND AIRCRAFT


CS:
ACA7575-B
CR Ref. N             Option Description             Price in
                                                        Jan
                                                      1999 US
                                                      Dollars
        
00-008     Performance - Extended Range
00-312     Additional Flap Setting, 8 Deg Take-Off
00-313     Certification - FAA Strapping
21-309     Ground Air Conditioning Connection
23-331     VHF Comm Third Radio Complete Provisions
23-350     Selcal System
25-060x    Paint Scheme - ACA - United Express
25-22-301  In-Arm Meal Tables At Front Row
25-22-302  Underseat Life Vest Pouches
25-22-303  Leather Passenger Seat Dress Covers, 50
           Seats
25-22-304  Reclining Passenger Seats
25-23-301  Second Flight Attendant Fold-Down Seat
           (With Hand-Set / Intercom)
25-24-301  Entrance Storage Compartment
25-26-301  Partition - LHD Windscreen
25-26-302  Partition - RHD Windscreen
25-31-301  G1 Galley: Provisions For Snack And Hot
           Beverage Service (Prov. 2 Carts)
25-31-306  G1 Galley: Storable Work Shelf
25-320xx   Interior Cabin - Midway
25-34-310  Atlas Standard Beverage Maker - Coffee
           (Qty 2)
25-61-3XX  Emergency Equipment - Midway - Type Spec
25-62-301  Third Oxygen Mask In Lhs Psu
30-001     Ice Detection - Red Warning Light
31-340     FDR - 128 WPS DFDR (L3Comm)
33-003     Red Beacon Lights
33-310     Tail Logo Flood Lights

           BUYER SELECTED OPTIONAL FEATURES FOR
               SECOND AIRCRAFT - CONTINUED


CS:
ACA7575-B
CR Ref. N    Option Description                      Price in
                                                       Jan
                                                       1999
                                                
33-320     Cargo Door Floodlights
34-328     GPWS - Enhanced (Allied  Signal)
34-330     FMS - Single Collins FMS-4200
34-350     GPS - Single Collins GPS-4000
34-362     Altimeter - Baro Setting Reminder
34-390     FMS - On Board Data Loader
35-004     Eros Magic Mask (Three)
38-313     8 US Gal. Galley Water/Waste Tank System
           (With G1 Galley Selection)
                            Total Technical Features  xxxxxx

Notes:

x   xxxxxx

xx  Interior Cabin - Midway entails the following:
- - second flight attendant removed after CofA
- - second flight attendant intercom system remains functional


                        CONTRACT CHANGE ORDER


PURCHASER:                Atlantic Coast Airlines

PURCHASE AGREEMENT NO.: PA-0454 (the "Agreement") AIRCRAFT TYPE: CRJ

C.C.O. NO.:               6                      DATED: July 19, 2002

PAGES:                    64


REASON FOR CHANGE

To amend the Agreement to:  (i) provide Buyer with twenty-five (25)
incremental aircraft (the "Incremental Aircraft") and thereby
increase the order to sixty-one (61) firm Aircraft, (ii) amend the
base price for the Buyer Selected Optional Features xxxxxx, (iii)
amend the payment terms for the Incremental Aircraft, (iv) amend the
acceptance procedures, (v) amend the Excusable Delay provisions to
include reference to the Additional xxxxxx Credit Memorandum and the
xxxxxx Credit Memorandum, (vi) amend the Non-Excusable Delay
provisions to include reference to the Additional xxxxxx Credit
Memorandum and the xxxxxx Credit Memorandum,  (vii) revise the
Delivery Schedule to include the delivery positions for the
Incremental Aircraft to be delivered under the Agreement, (viii)
delete the VHF NAV - FM Immunity (VIR-432+) from the Buyer Selected
Optional Features for the xxxxxx Aircraft, and delete the
Performance - Extended Range - 51,0000 lb MTOW and replace with the
MTOW -53,000 lb (Long Range Version) for the xxxxxx Aircraft, (ix)
extend the term of the FSR due to the Incremental Aircraft being
acquired, (x) revise the amount of the Credit Memoranda found in the
Credit Memoranda Letter Agreement due to the changes in the Buyer
Selected Optional Features and add a xxxxxx Credit Memorandum
applicable only to the Incremental Aircraft, (xi) amend the
financing provisions found in the Financing Letter Agreement, (xii)
amend the xxxxxx for the Buyer Selected Optional Features for the
Option Aircraft due to changes to such features and (xiii) introduce
a new Letter Agreement No. 14 xxxxxx for a cabin trainer data
package.  In addition, certain provisions agreed by the parties in
the xxxxxx not yet incorporated into the Agreement are hereby
incorporated into the Agreement to account for the xxxxxx in xxxxxx
value xxxxxx.

In addition, a new Letter Agreement No. 15 is introduced to xxxxxx.


                                       
PAGES TO BE SUBSTITUTED                   NEW/REVISED PAGES
Purchase Agreement, page 10               Attachment 1 to CCO No. 6
Purchase Agreement, pages 12a and 12b     Attachment 2 to CCO No. 6
Purchase Agreement, pages 19, 20, 21
 and 21A                                  Attachment 3 to CCO No. 6
Purchase Agreement, page 27               Attachment 4 to CCO No. 6
Purchase Agreement, page 29               Attachment 5 to CCO No. 6
Purchase Agreement, pages 52a and 52b     Attachment 6 to CCO No. 6
Purchase Agreement, pages 54a-i, 54a-ii
54b-i and 54b-ii                          Attachment 7 to CCO No. 6
Purchase Agreement, page C-1              Attachment 8 to CCO No. 6
Letter Agreement No. 001B, pages 1, 2
 and 3                                    Attachment 9 to CCO No. 6
Letter Agreement No. 004A                 Attachment 10 to CCO No. 6
Letter Agreement No. 009, pages 1, 2
and 3                                     Attachment 11 to CCO No. 6
Letter Agreement No. 0l2A, page 3         Attachment 12 to CCO No. 6
Letter Agreement No. 014                  Attachment 13 to CCO No. 6
Letter Agreement No. 015                  Attachment 14 to CCO No. 6


DESCRIPTION OF CHANGE:
P.A. and all Letter Agreements
All references tothirty-six (36) Aircraft are hereby changed to
refer to sixty-one (61) Aircraft.

P.A., page 10
Article 4.1 (b) is amended by deleting the words  xxxxxx from the
first, second and third lines and replacing them with the words
xxxxxx

Article 4.3.3 is amended by adding the words xxxxxx in the second
   line.

P.A., pages 12 and 12a
Article 5.2.3 is amended by (1) inserting sub-article (i) for the
xxxxxxAircraft which were previously the xxxxxx and amending (a)
accordingly, (2) inserting sub-article (ii) as follows:

xxxxxx
and (3) amending the last sentence in this Article by inserting the
words "and 5.2.3 (ii) (b), (c) and (d)" after the words "5.2.3 (b),
(c) and (d)".

P.A., pages 19, 20 and 21
Article 9.1 is amended to revise the delivery notice procedure and
to provide xxxxxx
P.A., page 27
Article 13.2 (b) is amended by adding the words xxxxxx before the
word "and" and replacing the words xxxxxx with the words xxxxxx
after the word "and" in the sixth line of this Article.

P.A., page 29
Article 14.2 is amended by adding the words "xxxxxx, before the word
"and" and the word xxxxxx after the word "and" in the fourth line of
this Article.

P.A., page 52 - Appendix II (Delivery Schedule)
The Delivery Schedule is amended to add the Incremental Aircraft to
be delivered under the Agreement.

P.A., page 54 - Appendix IV (Buyer Selected Optional Features)
Appendix IV is deleted in its entirety and replaced with Appendix IV-
A for the xxxxxxAircraft and Appendix IV-B for the xxxxxx Aircraft.

P.A., page C-1 - (FSR Term)
The term for the FSR is amended xxxxxx, due to the Incremental
   Aircraft being acquired.

Letter Agreement No. 001B, page 1 - (Credit Memorandum)
Article 2.0 of Letter Agreement No. 001B is amended by deleting the
words xxxxxx from the fifth and sixth lines and replacing them with
the words xxxxxx.

Articles 4.0 and 5.0 are amended by renumbering them Articles 5.0
and 6.0.  A new Article 4.0 is inserted as follows:

"In consideration of Buyer having entered into the term sheet dated
June 3, 2002 xxxxxx

xxxxxx  The credit memorandum, as adjusted, will be individually
known as the "xxxxxx Credit Memorandum" or collectively be known as
the "xxxxxx Credit Memoranda".
Letter Agreement No. 004 - (Financing)
Letter Agreement No. 004 is deleted in its entirety and replaced by
Letter Agreement No. 004A which is set forth in Attachment No. 10
hereto.

Letter Agreement No. 009 - (Reconciliation)
Article 2.0 of Letter Agreement No. 009 is replaced with the
   following paragraph:

xxxxxx

And Article 3.0 is amended by adding the words "Article 2.0," after
the words "No. 1" in the first sentence of this Article.

Letter Agreement No. 012A - (Additional Option Aircraft)
Letter Agreement No. 012A is amended by deleting the words xxxxxx
from the first through third lines and replacing them with the words
xxxxxx.

Letter Agreement No. 014
Letter Agreement No. 014 is introduced xxxxxx a cabin trainer data
package and is set forth in Attachment No. 13 hereto.

Letter Agreement No. 015
Letter Agreement No. 015 is introduced to xxxxxx of the xxxxxx

This CCO No. 6 is conditional upon Buyer executing CCO No. 21 to RJ-
350 failing which this CCO No. 6 shall become null and void.

EXCEPT AS SET FORTH ABOVE OR IN THE ATTACHMENTS HERETO, ALL OTHER
TERMS AND CONDITIONS OF THE AGREEMENT WILL REMAIN UNCHANGED

FOR AND ON BEHALF OF:                   FOR AND ON BEHALF OF:

Bombardier Inc.                         Atlantic Coast Airlines
Bombardier Aerospace
Regional Aircraft

Signed:  _________________________      Signed:___________________

Date:     __________________________    Date:_____________________


ARTICLE 4  -  PRICE

4.1       (a)    The  base  price  for  each  of  the  Aircraft
          (excluding  the Buyer Selected Optional Features)  Ex
          Works   (Incoterms  1990)  Bombardier's  offices   or
          premises in Montreal, Province of Quebec, Canada,  is
          xxxxxx expressed in January 1, 1999 dollars.

x         (b)   The  base price of the Buyer Selected  Optional
          Features  is  xxxxxx  expressed in  January  1,  1999
          dollars.

     The  Aircraft base price (the "Aircraft Base Price") shall
     be  the base price for the Aircraft as stated in paragraph
     (a),  plus  the base price of the Buyer Selected  Optional
     Features as stated in paragraph (b) ("Base Price").

4.2  The  price of the Aircraft (the "Aircraft Purchase Price")
     shall  be  the Base Price adjusted to the date of delivery
     to  reflect  economic fluctuations during the period  from
     January  1,  1999 to the respective delivery date  of  the
     Aircraft.  Such adjustments shall be based on the  formula
     as    found    in   Appendix   I   ("Economic   Adjustment
     Formula"),xxxxxx.

4.3  Upon  the  occurrence  of  events  as  described  in  this
     paragraph 4.3, there will be adjustments as follows:

     4.3.1      In the event that Bombardier and Buyer agree to
          any changes in the Specification or selected optional
          features,  or should changes in the Specification  or
          selected  optional  features  be  made  pursuant   to
          Article 11.1 or as a result of any Regulatory Changes
          pursuant to Article 8.4 which are chargeable to Buyer
          pursuant  to  Article  8.5,  or  in  the  event  that
          Bombardier and Buyer agree to any xxxxxx.

     4.3.2      The  Credit Memorandum adjustment shall  be  in
          accordance with the terms of Letter Agreement No. 1.

x    4.3.3      xxxxxx

ARTICLE 5  -  PAYMENT
5.1    Bombardier   acknowledges  having  previously  received   a
       deposit  of xxxxxx for each of the xxxxxx Aircraft  xxxxxx
       Aircraft) xxxxxx, totaling xxxxxx.

5.2    Advance Payment

5.2.1  xxxxxx

5.2.2  xxxxxx

x5.2.3 In  addition,  Buyer  shall make  payment  or  cause
       payment to be made for each firm Aircraft as follows:
       xxxxxx
       All payments referred to in paragraphs 5.2.3 (i) (b), (c) and
       (d) and 5.2.3 (ii) (b), (c) and (d) above are to be made on
       the first day of the applicable month.

5.3    Payment Terms

       On  or  before  the  Delivery Date Bombardier  shall  have
       received in full the amount of the Aircraft Purchase Price
       of  such Aircraft less the amount of the applicable Credit
       Memorandum  as set out in Letter Agreement No.  1  Article
       3.0,  which  will  be  credited by Bombardier  toward  the
       Aircraft  Purchase  Price  (said  amount  being  the  "Net
       Aircraft Purchase Price").

5.4    Subject to the provisions of Article 9.9 hereof, should Buyer
       fail to make any of the aforementioned payments on or before
       the stipulated date and Buyer does not correct  the  default
       within a period of thirty (30) days thereafter, this Agreement
       shall automatically terminate and Bombardier shall  have  no
       further obligation to Buyer under this Agreement, including the
       obligation to proceed  further with  the manufacture  of  the
       Aircraft on behalf of Buyer or the sale and/or delivery of the
       Aircraft to Buyer.  Bombardier shall have the option (but not
       the obligation) of waiving such termination should Buyer make
       arrangements  satisfactory to Bombardier for such payment and
       all future payments within ten (10) calendar days of Buyer's
       default.

ARTICLE 9 - ACCEPTANCE PROCEDURE

x9.1 Bombardier   shall  give  Buyer  notice,  by   facsimile   or
     telegraphic communication or other expeditious means, of  the
     date  of  readiness  of  each  Aircraft  for  inspection  and
     acceptance by Buyer as follows:

     a) Bombardier will give notice of no less than xxxxxx, confirming
        the day  (the "Readiness Date") on which the Aircraft will be
        available for delivery and the commencement of inspection.

        xxxxxx
        xxxxxx

9.2  Within  two (2) days following receipt by Buyer of the notice
     of Readiness Date Buyer shall:

   (a)  provide  notice to Bombardier as to the source and  method
        of payment of the balance of the Aircraft Purchase Price;

   (b)  identify    to   Bombardier   the   names    of    Buyer's
        representatives  who will participate in  the  inspection,
        flight test and acceptance; and

   (c)  provide  evidence  of  the  authority  of  the  designated
        persons  to  execute  the Certificate  of  Acceptance  and
        other delivery documents on behalf of Buyer.

9.3  Buyer   shall   have  three  (3)  consecutive  working   days
     commencing  on  the Readiness Date in which to  complete  the
     inspection and flight test (such three (3) working day period
     being  the  "Acceptance Period").  This three (3) day  period
     may  be  extended in the event of any delay by Bombardier  in
     making the Aircraft available for inspection and flight test.

9.4  Up  to  four (4) representatives of Buyer may participate  in
     Buyer's  ground  inspection  of  the  Aircraft  and  two  (2)
     representatives of Buyer may participate in the flight  test.
     Bombardier   shall,  if  requested  by  Buyer,   perform   an
     acceptance flight of not less than one (1) and not more  than
     three  (3)  hours duration.  Ground inspection, in accordance
     with  procedures  to be mutually agreed to, and  flight  test
     shall be conducted in accordance with Bombardier's acceptance
     procedures  (a copy of which shall be provided  to  Buyer  at
     least  30  days prior to the Scheduled Delivery Date  of  the
     First  Aircraft  hereunder), as  may  be  amended  by  mutual
     agreement  of  Buyer  and  Bombardier,  and  at  Bombardier's
     expense.  At  all times during ground inspection  and  flight
     test, Bombardier shall retain control over the Aircraft.

9.5  If  no Aircraft defect or discrepancy is revealed during  the
     ground  inspection  or flight test, Buyer  shall  accept  the
     Aircraft  on or before the last day of the Acceptance  Period
     in accordance with the provisions of Article 9.7.

9.6  If  any  material  defect or discrepancy in the  Aircraft  is
     revealed  by  Buyer's ground inspection or flight  test,  the
     defect   or   discrepancy  will  promptly  be  corrected   by
     Bombardier, at no cost to Buyer, which correction  may  occur
     during or after the Acceptance Period depending on the nature
     of  the  defect or discrepancy and of the time  required  for
     correction.    To  the  extent  necessary  to   verify   such
     correction, Bombardier shall perform one (1) or more  further
     acceptance  flights  or  ground  inspections  as  applicable.
     Notwithstanding  the provisions of Article  4.2,  should  the
     Delivery Date of an Aircraft occur in the month subsequent to
     the  Scheduled Delivery Date due to the correction of defects
     or discrepancies, xxxxxx.

9.7  Upon  completion  of  the  ground inspection  and  acceptance
     flight  of  the  Aircraft and correction of  any  defects  or
     discrepancies:

     (a)  Buyer will sign a Certificate of Acceptance (in the form
          of  Exhibit I hereto) for the Aircraft. Execution of the
          Certificate of Acceptance by or on behalf of Buyer shall
          be  evidence  of Buyer having examined the Aircraft  and
          found  it  in  accordance with the  provisions  of  this
          Agreement.  The date of signature of the Certificate  of
          Acceptance shall be the "Acceptance Date";

     (b)  Bombardier will supply a TC Certificate of Airworthiness
          for Export; and

     (c)  Buyer shall pay Bombardier the balance of the xxxxxx and
          any  other  amounts due, at which time Bombardier  shall
          issue an FAA bill of sale and a warranty bill of sale in
          a   form   acceptable  to  Bombardier   and   financiers
          (substantially in accordance with the forms attached  as
          Exhibit  II(a)  and  Exhibit II(b) hereto),  passing  to
          Buyer, or approved assignee pursuant to Article 20, good
          title  to  the  Aircraft free and clear  of  all  liens,
          claims, charges and encumbrances except for those liens,
          charges  or  encumbrances created by or claimed  through
          Buyer   (the  "Bill  of  Sale").   The  date  on   which
          Bombardier  delivers the Bill of Sale  and  Buyer  takes
          delivery of the Aircraft shall be the "Delivery Date".

     Delivery  of the Aircraft shall be evidenced by the execution
     and  delivery  of the Bill of Sale and of the Certificate  of
     Receipt of Aircraft (in the form of Exhibit III hereto).

9.8  Provided that Bombardier has met all of its obligations under
     this  Article  9, should Buyer not accept, pay for  and  take
     delivery of any of the Aircraft within ten (10) calendar days
     after  the  end  of the Acceptance Period of  such  Aircraft,
     Buyer  shall be deemed to be in default of the terms of  this
     Agreement xxxxxx.

9.9  Should  the  Buyer  be  in default pursuant  to  Article  9.8
     hereof,   Buyer   shall  promptly,  upon  demand,   reimburse
     Bombardier for all costs and expenses reasonably incurred  by
     Bombardier as a result of such Buyer's failure to  accept  or
     take  delivery of the Aircraft, including but not limited  to
     reasonable    amounts   for   storage,   insurance,    taxes,
     preservation or protection of the Aircraft, and provided that
     Bombardier has met all of its obligations under this  Article
     9,  should Buyer not accept, pay for and/or take delivery  of
     any  one of the Aircraft within forty-five (45) calendar days
     following  the end of the Acceptance Period, Bombardier  may,
     at  its  option, terminate the present Agreement with respect
     to   any  of  the  undelivered  Aircraft.   Bombardier  shall
     however, have the option (but not the obligation) of  waiving
     such  termination should Buyer, within ten (10) calendar days
     following such termination, make arrangements satisfactory to
     Bombardier  to  accept delivery and provide payment  for  all
     amounts owing or to become due pursuant to this Agreement.

xxxxxx

13.2    (a)   If  Bombardier concludes, based on its  appraisal
        of  the  facts  and normal scheduling procedures,  that
        due   to   Excusable   Delay  it  can   be   reasonably
        anticipated  that  delivery of  the  Aircraft  will  be
        delayed,  Bombardier shall give prompt  written  notice
        to  Buyer of such delay.  Bombardier and Buyer agree to
        collaborate  and  to  use their reasonable  efforts  to
        mitigate the impact of such delays upon the parties.

x       (b)   If,  as a result of an Excusable Delay,  delivery
        of  the  Aircraft will be delayed to a date beyond  the
        originally Scheduled Delivery Date or any revised  date
        previously  agreed to in writing by the parties,  Buyer
        and Bombardier agree, xxxxxx

     (c)In  the  event  of  an Excusable Delay,  or  xxxxxx  an
        anticipated  Excusable Delay xxxxxx  shall  conduct  an
        appraisal   of   the   facts  and   normal   scheduling
        procedures,  and if it concludes that delivery  of  one
        or  more of the Aircraft will be delayed  xxxxxx  after
        the  originally Scheduled Delivery Date or any  revised
        date  agreed to in writing by the parties,  xxxxxx  may
        then  terminate  this Agreement with  respect  to  such
        delayed Aircraft by giving written notice xxxxxx

ARTICLE 14  -  NON-EXCUSABLE DELAY

14.1 If  delivery of the Aircraft is delayed beyond the end  of
     the  Scheduled Delivery Date, by causes not excused  under
     Article 13.1, this shall constitute a non-excusable  delay
     (a "Non-Excusable Delay").

x14.2    If as a result of an Non-Excusable Delay, delivery  of
     the  Aircraft  will  be  delayed  to  a  date  beyond  the
     originally  Scheduled Delivery Date or  any  revised  date
     previously  agreed  to  in writing  by  the  parties,  the
     Aircraft  Purchase  Price  of the  Aircraft  at  delivery,
     xxxxxx



                             APPENDIX II
x
                          DELIVERY SCHEDULE

                        
   First Aircraft          xxxxxx
   Second Aircraft         xxxxxx
   Third Aircraft          xxxxxx
   Fourth Aircraft         xxxxxx
   Fifth Aircraft          xxxxxx
   Sixth Aircraft          xxxxxx
   Seventh Aircraft        xxxxxx
   Eighth Aircraft         xxxxxx
   Ninth Aircraft          xxxxxx
   Tenth Aircraft          xxxxxx
   Eleventh Aircraft       xxxxxx
   Twelfth Aircraft        xxxxxx
   Thirteenth Aircraft     xxxxxx
   Fourteenth Aircraft     xxxxxx
   Fifteenth Aircraft      xxxxxx
   Sixteenth Aircraft      xxxxxx
   Seventeenth Aircraft    xxxxxx
   Eighteenth Aircraft     xxxxxx
   Nineteenth Aircraft     xxxxxx
   Twentieth Aircraft      xxxxxx
   Twenty-first Aircraft   xxxxxx
   Twenty-second Aircraft  xxxxxx
   Twenty-third Aircraft   xxxxxx
   Twenty-fourth Aircraft  xxxxxx
   Twenty-fifth Aircraft   xxxxxx
   Twenty-sixth Aircraft   xxxxxx
   Twenty-seventh Aircraft xxxxxx
   Twenty-eighth Aircraft  xxxxxx
   Twenty-ninth Aircraft   xxxxxx
   Thirtieth Aircraft      xxxxxx
   Thirty-first Aircraft   xxxxxx
   Thirty-second Aircraft  xxxxxx
   Thirty-third Aircraft   xxxxxx
   Thirty-fourth Aircraft  xxxxxx
   Thirty-fifth Aircraft   xxxxxx
   Thirty-sixth Aircraft   xxxxxx
   Thirty-seventh Aircraft xxxxxx
   Thirty-eighth Aircraft  xxxxxx

                    DELIVERY SCHEDULE - CONTINUED

   Thirty-ninth Aircraft   xxxxxx
   Fortieth Aircraft       xxxxxx
   Forty-first Aircraft    xxxxxx
   Forty-second Aircraft   xxxxxx
   Forty-third Aircraft    xxxxxx
   Forty-fourth Aircraft   xxxxxx
   Forty-fifth Aircraft    xxxxxx
   Forty-sixth Aircraft    xxxxxx
   Forty-seventh Aircraft  xxxxxx
   Forty-eighth Aircraft   xxxxxx
   Forty-ninth Aircraft    xxxxxx
   Fiftieth Aircraft       xxxxxx
   Fifty-first Aircraft    xxxxxx
   Fifty-second Aircraft   xxxxxx
   Fifty-third Aircraft    xxxxxx
   Fifty-fourth Aircraft   xxxxxx
   Fifty-fifth Aircraft    xxxxxx
   Fifty-sixth Aircraft    xxxxxx
   Fifty-seventh Aircraft  xxxxxx
   Fifty-eight Aircraft    xxxxxx
   Fifty-ninth Aircraft    xxxxxx
   Sixtieth Aircraft       xxxxxx
   Sixty-first Aircraft    xxxxxx


                       APPENDIX IV-A

           BUYER SELECTED OPTIONAL FEATURES FOR THE
                 THIRD THROUGH NINTH AIRCRAFT



CS:
A7553 B
CR Ref. N             Option Description              Price in
                                                      Jan 1999
                                                         US
                                                       Dollars
                                                  
00-008     Performance - Extended Range - 51,000 lb     xxxxxx
           MTOW
00-312     Additional Take Off Flap Setting - 8 Deg     xxxxxx
00-313     Certification - FAA (FAR 25)                 xxxxxx
25-060     Paint Scheme - Atlantic Coast Airline -      xxxxxx
xx         United Express
25-22-301  PAX Seat - In-Arm Meal Trays In Front Row    xxxxxx
25-22-302  PAX Seat - Life Vest Pouch (25 Seat          xxxxxx
           Pairs)
25-22-304  PAX Seat - Recline Feature (21 Seat          xxxxxx
           Pairs)
25-24-301  Entrance Stowage Compartment - Galley        xxxxxx
           Insert Provisions
25-31-301  G1 Galley - Provisions For Snack & Hot       xxxxxx
           Beverage Service
25-31-306  G1 Galley - Stowable Work Shelf              xxxxxx
25-34-310  Beverage Maker -ATLAS Std (APC, Qty 2)       xxxxxx
31-340     FDR - 128 WPS DFDR (L3Comm)                  xxxxxx
33-003     Lights - Red Beacon                          xxxxxx
33-310     Lights - Tail Logo                           xxxxxx
33-320     Lights - Baggage Door Floodlight             xxxxxx
34-328     GPWS - Enhanced (Allied  Signal)             xxxxxx
34-335     FMS - Single, ACARS Compatible (Collins      xxxxxx
           FMS-4200)
34-350     GPS - Single (Collins GPS-4000)              xxxxxx
34-362     Altimeter - Baro Setting Reminder            xxxxxx
35-004     Oxygen - Flight Crew (Eros Magic Mask,       xxxxxx
           Three)
38-313     Water -  8 US Gal.Tank                       xxxxxx
              Total Buyer Selected Optional Features    xxxxxx

x
                   APPENDIX IV-A - CONTINUED

           BUYER SELECTED OPTIONAL FEATURES FOR THE
                 THIRD THROUGH NINTH AIRCRAFT


CS:
A7553 B
CR Ref. N             Option Description             Price in
                                                     Jan 1999
                                                        US
                                                      Dollars
                                                  
Notes:
x
1          Xxxxxx
25-26-301  Partition - LHD Windscreen                   xxxxxx
25-26-302  Partition - RHD Windscreen                   xxxxxx
30-001     Ice Detection - Red Warning Light            xxxxxx
31-320     EICAS 2000                                   xxxxxx
2          xxxxxx
34-353     VHF NAV - FM Immunity (VIR-432+)             xxxxxx
xxxxxx

All prices listed above are expressed in January 1, 1999 US dollars,
and are subject to economic adjustment to the date of aircraft
delivery as provided in the Agreement.


                        APPENDIX IV-B

           BUYER SELECTED OPTIONAL FEATURES FOR THE
              TENTH THROUGH SIXTY-FIRST AIRCRAFT



CS:
A7553 B
CR Ref. N             Option Description              Price in
                                                      Jan 1999
                                                         US
                                                       Dollars
                                                  
00-015     MTOW - 53,000 lb (Long Range Version)        xxxxxx
x
00-312     Additional Take Off Flap Setting - 8 Deg     xxxxxx
00-313     Certification - FAA (FAR 25)                 xxxxxx
25-060     Paint Scheme - Atlantic Coast Airline -      xxxxxx
xx         United Express
25-22-301  PAX Seat - In-Arm Meal Trays In Front Row    xxxxxx
25-22-302  PAX Seat - Life Vest Pouch (25 Seat          xxxxxx
           Pairs)
25-22-304  PAX Seat - Recline Feature (21 Seat          xxxxxx
           Pairs)
25-24-301  Entrance Stowage Compartment - Galley        xxxxxx
           Insert Provisions
25-31-301  G1 Galley - Provisions For Snack & Hot       xxxxxx
           Beverage Service
25-31-306  G1 Galley - Stowable Work Shelf              xxxxxx
25-34-310  Beverage Maker -ATLAS Std (APC, Qty 2)       xxxxxx
31-340     FDR - 128 WPS DFDR (L3Comm)                  xxxxxx
33-003     Lights - Red Beacon                          xxxxxx
33-310     Lights - Tail Logo                           xxxxxx
33-320     Lights - Baggage Door Floodlight             xxxxxx
34-328     GPWS - Enhanced (Allied  Signal)             xxxxxx
34-335     FMS - Single, ACARS Compatible (Collins      xxxxxx
           FMS-4200)
34-350     GPS - Single (Collins GPS-4000)              xxxxxx
34-362     Altimeter - Baro Setting Reminder            xxxxxx
35-004     Oxygen - Flight Crew (Eros Magic Mask,       xxxxxx
           Three)
38-313     Water -  8 US Gal.Tank                       xxxxxx
                                            Subtotal    xxxxxx

1             Less: Fleet Amortized Credit for Long-    xxxxxx
                             Range MTOW (CRN 00-015)
              Less: Additional Credit for Long-Range    xxxxxx
                                   MTOW (CRN 00-015)

         Grand Total Buyer Selected Optional Features   xxxxxx

x
                  APPENDIX IV-B - CONTINUED

           BUYER SELECTED OPTIONAL FEATURES FOR THE
              TENTH THROUGH SIXTY-FIRST AIRCRAFT


CS:
A7553 B
CR Ref. N             Option Description              Price in
                                                      Jan 1999
                                                         US
                                                       Dollars
                                                  
Notes:
x
1          Xxxxxx
2          Xxxxxx
25-26-301  Partition - LHD Windscreen                   xxxxxx
25-26-302  Partition - RHD Windscreen                   xxxxxx
30-001     Ice Detection - Red Warning Light            xxxxxx
31-320     EICAS 2000                                   xxxxxx
3          xxxxxx:
34-353     VHF NAV - FM Immunity (VIR-432+)               xxxx
                                                            xx
xxxxxx

All prices listed above are expressed in January 1, 1999 US dollars,
and are subject to economic adjustment to the date of aircraft
delivery as provided in the Agreement.


                       CUSTOMER SUPPORT SERVICES


ANNEX A -      TECHNICAL SUPPORT, SPARE PARTS, TRAINING AND
               TECHNICAL DATA


The  following Customer Support Services are those services to which
reference is made in Article 3 of the Agreement.

ARTICLE 1 - TECHNICAL SUPPORT

1.1  Factory Service

     Bombardier  agrees  to maintain or cause to be  maintained  the
     capability  to  respond  to  Buyer's  technical  inquiries,  to
     conduct investigations concerning maintenance problems  and  to
     issue  findings  and  recommend action thereon.   This  service
     shall  be provided for as long as ten (10) CL-600-2B19 aircraft
     remain in commercial air transport service.

1.2  Field Service Representative

     1.2.1     Services

          Bombardier   shall   assign   one   (1)   Field    Service
          Representative ("FSR") to Buyer's main base  of  operation
          or other location as may be mutually agreed.

     1.2.2     Term

x         Such  assignment shall be for xxxxxx, and  shall  commence
          approximately one (1) month prior to the Delivery Date  of
          the  first  Aircraft. At Buyer's request, the  term  shall
          begin upon the expiration of the term of Buyer's right  to
          assignment of an FSR pursuant to purchase agreement No. PA-
          0350.  The  FSR assignment may be extended  on  terms  and
          conditions to be mutually agreed.

     1.2.3     Responsibility

The FSR's responsibility shall be to provide technical advice to
Buyer for the line maintenance and operation of the Aircraft systems
and troubleshooting during scheduled and unscheduled maintenance by
Buyer's designated personnel ("FSR Services").August 02, 2000

Atlantic Coast Airlines
515A Shaw Road,
Dulles, Virginia,
U.S.A. 20166

Gentlemen,

xLetter  Agreement No. 001B to Purchase Agreement  No.  PA-0454
dated  July  29, 1999 (the "Agreement" between Bombardier  Inc.
("Bombardier")  and Atlantic Coast Airlines ("Buyer")  relating
to  the  purchase  of  sixty-one  (61)  Canadair  Regional  Jet
Aircraft (the "Aircraft")

This  Letter  Agreement No. 001B dated August 02, 2000  cancels
and  supersedes Letter Agreement No. 001A dated September,  24,
1999.

Subject:       Credit Memoranda

1.0  This  letter constitutes an integral part of the Agreement
     and  evidences our further agreement with the matters  set
     forth  below.  All terms used herein and in the  Agreement
     and not defined herein, shall have the same meaning as  in
     the Agreement.

x    2.0   In  consideration of Buyer having entered  into  the
     above  referenced Agreement for the purchase of  sixty-one
     (61)  Aircraft,  Bombardier  will  issue  to  Buyer,  upon
     delivery  and  payment of the price  of  the  Aircraft  in
     accordance with the Agreement, a credit memorandum in  the
     amount of xxxxxx for each of the Aircraft xxxxxx

3.0  xxxxxx   The  credit memorandum will  be adjusted  on  the
     same  pro-rata  percentage calculation as  other  aircraft
     price changes due to changes in the Specification or Buyer
     selected  optional features as otherwise provided  for  in
     this  Agreement.  The credit memorandum, as adjusted, will
     be  individually  known  as  the  "Credit  Memorandum"  or
     collectively be known as the "Credit Memoranda".

xx   4.0  xxxxxx

x    5.0   In  the  event of the Termination of the  Agreement,
     this Letter Agreement shall become automatically null  and
     void with respect to any undelivered Aircraft.

x    6.0   The provisions of this Letter Agreement are personal
     to  Buyer  and shall not be assigned or otherwise disposed
     of  by Buyer, except as required for financing purposes in
     accordance  with Letter Agreement No. 004 (Financing)  and
     except  as  part  of  an assignment of  the  Agreement  as
     expressly  permitted  in  Article  20  of  the  Agreement,
     without the prior written consent of Bombardier.
Should there be any inconsistency between this Letter Agreement
and the Agreement with respect to the subject matter covered by
the terms hereof, then this Letter Agreement shall prevail.

Yours truly,

BOMBARDIER INC.

________________________                Date:_____________
Name:
Title:

Acknowledged and Accepted

Atlantic Coast Airlines

________________________                Date:_____________
Name:
Title:


July 19, 2002

Atlantic Coast Airlines
45200 Business Court,
Sterling, Virginia,
U.S.A. 20166

Gentlemen,

x  Letter  Agreement  No.  004A to Purchase  Agreement  No.  PA-0454
   dated  July  29,  1999  (the "Agreement"),  as  amended,  between
   Bombardier  Inc.  ("Bombardier")  and  Atlantic  Coast   Airlines
   ("Buyer")  relating  to the purchase of sixty-one  (61)  Canadair
   Regional Jet Aircraft (the "Aircraft")

This  Letter  Agreement No. 004A dated July  19,  2002  cancels  and
supersedes Letter Agreement No. 004 dated July 29, 1999.

Subject:       Financing

1.0  This  letter constitutes an integral part of the Agreement  and
     evidences  our  further agreement with the  matters  set  forth
     below.   All  terms  used herein and in the Agreement  and  not
     defined  herein,  shall  have  the  same  meaning  as  in   the
     Agreement.

     1.1 This Letter  Agreement  describes  the  general  terms  and
         conditions  of the financing assistance to be  provided  by
         Bombardier to Buyer. xxxxxx

2.0  Financing Assistance

     2.1 Financing   assistance   referred  to  in   this   Letter
       Agreement  No. 004 shall apply only to the Financed Aircraft.
       Financing  for  the  Financed Aircraft will  be  arranged  by
       Buyer  working in coordination with Bombardier. The  form  of
       any  support  which may be provided by Bombardier  is  to  be
       treated  as confidential and is not to be provided  by  Buyer
       to   any  third  party  without  the  third  party  executing
       Bombardier's  confidentiality  agreement.   It   is   Buyer's
       responsibility  to  have such form executed  with  any  third
       party  prior  to  Buyer's disclosure of any such  information
       and  to  provide such form to Bombardier for  approval.   The
       above  does  not  apply where Buyer or the  applicable  third
       party  is  required to disclose such information  by  law  or
       compelled by court order to do so.

2.2    xxxxxx
2.3    xxxxxx
3.0    xxxxxx
4.0    xxxxxx
5.0    xxxxxx

6.0  In  the  event of the termination of the Agreement pursuant  to
     Article 16.1 or 16.2 as a result of a default or breach of  the
     Agreement   by  Buyer,  this  Letter  Agreement  shall   become
     automatically  null  and void with respect to  any  undelivered
     Aircraft.

7.0 The  provisions of this Letter Agreement are personal  to  Buyer
    and  shall  not be assigned or otherwise disposed  of  by  Buyer
    except  as permitted herein or as part of an assignment  of  the
    Agreement expressly permitted by Article 20 of the Agreement.

Should there be any inconsistency between this Letter Agreement  and
the  Agreement  with respect to the subject matter  covered  by  the
terms hereof, then this Letter Agreement shall prevail.

Yours truly,
BOMBARDIER INC.

________________________                Date:_____________
Name:
Title:

Acknowledged and Accepted

Atlantic Coast Airlines

________________________                Date:_____________
Name:
Title:

July 29, 1999

Atlantic Coast Airlines
515A Shaw Road
Dulles, Virginia,
U.S.A. 20166

Gentlemen,

xLetter  Agreement No. 009 to Purchase Agreement No.  PA-0454  dated
July   29,   1999   (the   "Agreement"   between   Bombardier   Inc.
("Bombardier") and Atlantic Coast Airlines ("Buyer") relating to the
purchase  of   sixty-one (61) Canadair Regional  Jet  Aircraft  (the
"Aircraft")

Subject:       Reconciliation

1.0 The  parties  recognize that in the course of the  administration
    of this Agreement, xxxxxx

x2.0 xxxxxx

3.0  xxxxxx

4.0This  letter  constitutes an integral part of the  Agreement  and
   evidences  our  further  agreement with  the  matters  set  forth
   below.   All  terms  used  herein and in the  Agreement  and  not
   defined herein, shall have the same meaning as in the Agreement.

5.0The  provisions  of this Letter Agreement are personal  to  Buyer
   and  shall  not  be assigned or otherwise disposed  of  by  Buyer
   except  as  part of an assignment of the Agreement (in whole  not
   in  part)  expressly permitted under Article 20 of the  Agreement
   and otherwise such consent shall not be unreasonably withheld.

6.0In  the  event of the Termination of the Agreement,  this  Letter
   Agreement  shall become automatically null and void with  respect
   to any undelivered Aircraft.

7.0Should  there be any inconsistency between this Letter  Agreement
   and  the Agreement with respect to the subject matter covered  by
   the terms hereof, then this Letter Agreement shall prevail.

Yours very truly,
BOMBARDIER INC.
________________________                Date:_____________
Name :
Title:

Acknowledged and Accepted

Atlantic Coast Airlines
________________________                Date:_____________
Name:
Title:




Attachment No. 12 to C.C.O. No. 6 dated July 19, 2002
Letter Agreement No. 012A
Additional Option Aircraft

(b)            The   base  price  of  the  Buyer  Selected  Optional
               Features is xxxxxx

          The Option Aircraft base price shall be the base price for
          the  Option  Aircraft  as stated in  paragraph  (b)(ii)(a)
          above,  plus the base price of the Buyer Selected Optional
          Features  as  stated  in paragraph (b)(ii)(b)  above  (the
          "Option Aircraft Base Price").

          The  price  of  the Option Aircraft (the "Option  Aircraft
          Purchase  Price") shall be the Option Aircraft Base  Price
          adjusted xxxxxx

     (iii)     As consideration for this option, Buyer shall make or
          cause  to  make payment to Bombardier a xxxxxx per  Option
          Aircraft (the "Option Deposit") upon execution of CCO  No.
          2, for a total amount of xxxxxx.  The amount of xxxxxx

     (iv) Unless expressly provided for in the Agreement, the  terms
          and   conditions   of  the  Agreement  (including   Letter
          Agreements,  except  as noted below) shall  apply  mutatis
          mutandis  to the Option Aircraft, with the exception  that
          the  provisions  with respect to Annex A training  courses
          as  specified  in  Article 3.2.4 of the Agreement  (Flight
          Attendant   Courses),  shall  not  apply  to  the   Option
          Aircraft.

     (v)  The  following  Letter Agreement shall not  apply  to  the
          Option Aircraft and is hereby excluded:

          Letter Agreement No. 012 (Additional Option Aircraft)


July 19, 2002

Atlantic Coast Airlines
45200 Business Court,
Dulles, Virginia,
U.S.A. 20166

Gentlemen,

xxLetter  Agreement No. 014 to Purchase Agreement No. PA-0454  dated
July   29,   1999   (the   "Agreement"   between   Bombardier   Inc.
("Bombardier") and Atlantic Coast Airlines ("Buyer") relating to the
purchase  of  sixty-one  (61) Canadair Regional  Jet  Aircraft  (the
"Aircraft")

Subject:  Cabin Trainer Data Package

Gentlemen:

1.0 This  letter  constitutes an integral part of the Agreement  and
    evidences  our  further  agreement with the  matters  set  forth
    below.  All  terms  used  herein and in the  Agreement  and  not
    defined  herein,  shall  have  the  same  meaning  as   in   the
    Agreement.

2.0 In  consideration of Buyer having entered into  the  term  sheet
    dated  June  3,  2002 and in recognition of Buyer's  request  to
    manufacture a Cabin Trainer,xxxxxx

3.0  In  the  event of the Termination of the Agreement, this Letter
     Agreement shall become automatically null and void with respect
     to any undelivered Aircraft.

4.0  The  provisions of this Letter Agreement are personal to  Buyer
     and  shall  not be assigned or otherwise disposed of by  Buyer,
     except  as  part  of  an assignment of the Agreement  expressly
     permitted  by  Article 20 of the Agreement, without  the  prior
     written consent of Bombardier.

Should there be any inconsistency between this Letter Agreement  and
the  Agreement  with respect to the subject matter  covered  by  the
terms hereof, then this Letter Agreement shall prevail.
Yours very truly,
BOMBARDIER INC.

________________________                Date:_____________
Name:
Title:
Acknowledged and Accepted

ATLANTIC COAST AIRLINES

________________________                Date:_____________
Name:
Title:

July 19, 2002

Atlantic Coast Airlines
45200 Business Court,
Dulles, Virginia,
U.S.A. 20166

Gentlemen,

xxLetter  Agreement No. 015 to Purchase Agreement No. PA-0454  dated
July  29, 1999, as amended (the "Agreement" between Bombardier  Inc.
("Bombardier") and Atlantic Coast Airlines ("Buyer") relating to the
purchase  of  sixty-one  (61) Canadair Regional  Jet  Aircraft  (the
"Aircraft")

Subject:  xxxxxx Status

Gentlemen:

1.0 This  letter  constitutes an integral part of the Agreement  and
    evidences  our  further  agreement with the  matters  set  forth
    below.  All  terms  used  herein and in the  Agreement  and  not
    defined  herein,  shall  have  the  same  meaning  as   in   the
    Agreement.

2.0 Buyer  and Bombardier agree to the following pertaining  to  the
    xxxxxx  dated  xxxxxx,  as  amended by  revision  thereto  dated
    xxxxxx

    2.1.    xxxxxx
    2.2    xxxxxx

    2.3     The  remaining provisions of the xxxxxx (Articles 2,  3,
       and 4) pertaining to the xxxxxx are no longer in effect..
3.0  xxxxxx
4.0  xxxxxx
5.0  The  provisions of this Letter Agreement are personal to  Buyer
     and  shall  not be assigned or otherwise disposed of by  Buyer,
     except  as  part  of  an assignment of the Agreement  expressly
     permitted  by  Article 20 of the Agreement, without  the  prior
     written consent of Bombardier.

Should there be any inconsistency between this Letter Agreement  and
the  Agreement  with respect to the subject matter  covered  by  the
terms hereof, then this Letter Agreement shall prevail.

Yours very truly,

BOMBARDIER INC.
Name:
Title:

Acknowledged and Accepted

ATLANTIC COAST AIRLINES
Name:
Title: