EXHIBIT 4.23


                                                                [EXECUTION COPY]

$175,000,000    SERIES 1999-1 5.90% RENTAL CAR ASSET BACKED NOTES, CLASS A
$ 20,000,000    SERIES 1999-1 6.20% RENTAL CAR ASSET BACKED NOTES, CLASS B
$ 42,500,000    SERIES 1999-1 6.50% RENTAL CAR ASSET BACKED NOTES, CLASS C
$ 12,500,000    SERIES 1999-1 7.10% RENTAL CAR ASSET BACKED NOTES, CLASS D

                                   RENTAL CAR FINANCE CORP.

                          Series 1999-1 Rental Car Asset Backed Notes


                                    NOTE PURCHASE AGREEMENT


                                                                  April 29, 1999

Credit Suisse First Boston Corporation
11 Madison Avenue
New York, New York  10010-3629

Chase Securities Inc.
270 Park Avenue
New York, New York 10017

Dear Sirs:

        1. Introductory.  Rental Car Finance Corp., an Oklahoma corporation (the
"Company") and a wholly-owned  indirect  subsidiary of Dollar Thrifty Automotive
Group, Inc., a Delaware corporation ("DTAG"), proposes, subject to the terms and
conditions  stated  herein,  to issue and sell to  Credit  Suisse  First  Boston
Corporation  ("Credit  Suisse") and Chase  Securities Inc.  ("Chase")  (each, an
"Initial Purchaser" and together, the "Initial Purchasers"):

$175,000,000 principal amount of its Series 1999-1 5.90% Rental Car Asset Backed
Notes,  Class A, $20,000,000  principal amount of its Series 1999-1 6.20% Rental
Car Asset Backed  Notes,  Class B,  $42,500,000  principal  amount of its Series
1999-1 6.50% Rental Car Asset Backed Notes,  Class C and  $12,500,000  principal
amount of its Series 1999-1 7.10% Rental Car Asset Backed Notes, Class D

(collectively, the "Offered Securities") to be issued under (i) a base indenture
dated as of December 13, 1995 (as amended,  modified or supplemented to the date
hereof,  the  "Base  Indenture"),  and a Series  1999-1  Supplement  to the Base
Indenture,  dated as of April 29, 1999 (the "Series 1999-1 Supplement")  between
the  Company and Bankers  Trust  Company,  as Trustee  (the Base  Indenture,  as
supplemented  by the Series  1999-1  Supplement,  is  referred  to herein as the
"Indenture"),  on a private  placement  basis  pursuant to an exemption from the
registration  requirements  of the  United  States  Securities  Act of 1933,  as
amended (the "Securities Act"), and hereby agrees with the Initial Purchasers as
follows:

        2.  Representations  and Warranties of the Company and DTAG. Each of the
Company  and DTAG  represents  and  warrants  to, and agrees  with,  the Initial
Purchasers that:

                                            -1-






               (a) A preliminary  private placement  memorandum  relating to the
        Offered Securities has been prepared by the Company.

                 Such preliminary  private placement  memorandum as supplemented
        as of the date of this Agreement, the final private placement memorandum
        together with the documents  listed in Schedule B to this  Agreement and
        any other  document  approved by the Company or DTAG for delivery by the
        Initial  Purchasers  to offerees  in  connection  with the  contemplated
        resale of the Offered Securities, including such financial statements as
        are specified in Schedule C to this Agreement that have been provided to
        the  Initial  Purchasers  for such  purpose  by DTAG,  are  collectively
        referred to as the "Offering Document".

                 The preliminary  private  placement  memorandum as of its date,
        the private  placement  memorandum  as of its date and as of the Closing
        Date (as defined below), the remaining documents comprising the Offering
        Document  as of their dates and as of, as  applicable,  the date of this
        Agreement  and the Closing  Date do not or will not on such date include
        any untrue  statement  of a material  fact or omit to state any material
        fact necessary in order to make the statements  therein, in the light of
        the  circumstances  under  which they were  made,  not  misleading.  The
        preceding sentence does not apply to statements in or omissions from the
        Offering  Document based upon written  information  furnished to DTAG or
        the Company by the Initial Purchasers  specifically for use therein,  it
        being  understood  and  agreed  that the only such  information  is that
        described as such in Section 7(b).

                 The  information  required  to  be  delivered  to  holders  and
        prospective  purchasers  of the Offered  Securities  pursuant to Section
        7.27 of the Base Indenture in accordance with Rule 144A(d)(4)  under the
        Securities Act (the "Additional  Issuer  Information")  does not include
        any untrue  statement  of a material  fact or omit to state any material
        fact  necessary  to make the  statements  therein,  in the  light of the
        circumstances under which they were made, not misleading.  The preceding
        sentence  does  not  apply  to  statements  in  or  omissions  from  the
        Additional Issuer Information based upon written  information  furnished
        to DTAG or the Company by the Initial  Purchasers  specifically  for use
        therein,  it being  understood and agreed that the only such information
        is that described as such in Section 7(b).

               (b) The  Offered  Securities  have  been duly  authorized  by the
        Company and, when  delivered and paid for pursuant to this Agreement and
        the Indenture, will have been duly executed,  authenticated,  issued and
        delivered and will constitute  valid and legally binding  obligations of
        the Company,  entitled to the  benefits  provided in the  Indenture  and
        enforceable  in  accordance  with their  terms,  subject to  bankruptcy,
        insolvency, fraudulent transfer, reorganization,  moratorium and similar
        laws of general applicability relating to or affecting creditors' rights
        and to general equity principles.

               (c) The  Company  has been duly  incorporated  and is an existing
        corporation  in good  standing  under the laws of the State of Oklahoma,
        with power and authority (corporate and other) to own its properties and
        conduct its business as described in the Offering Document.

               DTAG has been duly incorporated and is an existing corporation in
        good  standing  under the laws of the State of Delaware,  with power and
        authority  (corporate  and other) to own its  properties and conduct its
        business as described in the Offering Document.

               Each of the Company and DTAG is duly qualified and licensed to do
        business  as a  foreign  corporation  in  good  standing  in  all  other
        jurisdictions in which its ownership or lease of property or the conduct
        of its business requires such qualification, other than jurisdictions in
        which  the  failure  to  be  so  qualified   and  licensed   shall  not,
        individually or in the aggregate,  have a material adverse effect on the
        condition (financial or other), business or results of operations of the
        Company,  DTAG and  DTAG's  subsidiaries  taken  as a  whole,  or on the
        ability of the Company or DTAG to perform its obligations under

                                            -2-







        (as  applicable)  this  Agreement  or the other  Related  Documents  (as
        defined in the Series 1999-1 Supplement) to which it is a party.

               (d) The Series 1999-1  Supplement has been duly  authorized;  the
        Offered  Securities  have been  duly  authorized;  and when the  Offered
        Securities  are delivered and paid for pursuant to this Agreement on the
        Closing Date, the Series 1999-1  Supplement will have been duly executed
        and  delivered,  such Offered  Securities  will have been duly executed,
        authenticated,  issued  and  delivered  and will  constitute  valid  and
        legally  binding  obligations of the Company,  enforceable in accordance
        with  their  terms,  subject  to  bankruptcy,   insolvency,   fraudulent
        transfer,  reorganization,   moratorium  and  similar  laws  of  general
        applicability  relating to or affecting creditors' rights and to general
        equity principles.

               (e) No consent, approval,  authorization,  or order of, or filing
        with, any  governmental  agency or body or any court is required for the
        consummation of the  transactions  contemplated by this Agreement or any
        other Related  Document in connection  with the issuance and sale of the
        Offered  Securities  by the Company,  except the filing of any financing
        statements as may be required to perfect the interest of the Trustee and
        the  Master  Collateral  Agent  (as  defined  in the  Indenture)  in the
        collateral pledged thereto under the Related Documents.

               (f)  Neither  the  Company  nor  DTAG  is  in  violation  of  its
        Certificate of Incorporation or By-laws or in default in the performance
        or  observance  of any  obligation,  agreement,  covenant  or  condition
        contained in any  agreement or  instrument  to which it is a party or by
        which it or its properties are bound which would have a material adverse
        effect on the  transactions  contemplated  in this  Agreement  or in the
        Related Documents.

               (g) The execution, delivery and performance of this Agreement and
        the other  Related  Documents,  and the issuance and sale of the Offered
        Securities  and  compliance  with the terms and  provisions  hereof  and
        thereof will not result in a breach or violation of any of the terms and
        provisions  of, or constitute a default  under,  any statute,  any rule,
        regulation  or order of any  governmental  agency or body or any  court,
        domestic or foreign,  having jurisdiction over the Company, DTAG, or, to
        the best knowledge of the Company or DTAG, any subsidiary of DTAG or any
        of their  properties,  or any  agreement  or  instrument  to  which  the
        Company,  DTAG,  or, to the best  knowledge of the Company or DTAG,  any
        subsidiary  of DTAG is a party or by which  the  Company,  DTAG,  or any
        subsidiary  of DTAG is bound or to which  any of the  properties  of the
        Company,  DTAG,  or, to the best  knowledge of the Company or DTAG,  any
        subsidiary of DTAG is subject, or the charter or by-laws of the Company,
        DTAG,  or, to the best  knowledge of the Company or DTAG, any subsidiary
        of DTAG, that would have a material adverse effect on the ability of the
        Company or DTAG to perform its obligations  under (as  applicable)  this
        Agreement or the other Related  Documents to which it is a party or that
        are  otherwise  material  in the  context  of the  sale  of the  Offered
        Securities.

               Each of the  Company  and  DTAG  has  full  power  and  authority
        (corporate  and  otherwise)  to enter into this  Agreement and the other
        Related  Documents  to  which  it  is a  party  and  to  consummate  the
        transactions contemplated hereby and thereby,  including, in the case of
        the Company,  the full power and authority to authorize,  issue and sell
        the Offered  Securities as contemplated by this Agreement and the Series
        1999-1 Supplement.

               (h) As of the Closing Date, the representations and warranties of
        the Company and DTAG contained in the Related Documents will be true and
        correct, except that with respect to any such representation or warranty
        which represents or warrants as to a specific date, such  representation
        or warranty shall be true and correct as of such date.


                                            -3-







               (i)  This  Agreement  has  been  duly  authorized,  executed  and
        delivered by the Company and DTAG.

               (j) Except as disclosed in the Offering Document, the Company has
        good and  marketable  title to all properties and assets owned by it, in
        each  case  free  from  liens,   encumbrances  and  defects  that  would
        materially affect the value thereof or materially interfere with the use
        made or to be made thereof by it.

               (k) The Company,  DTAG and, to the best  knowledge of the Company
        or  DTAG,  DTAG's  subsidiaries   possess  all  material   certificates,
        licenses,  authorities  or permits  issued by  appropriate  governmental
        agencies or bodies  necessary  to conduct the  business  now operated by
        them and have not  received  any notice of  proceedings  relating to the
        revocation or modification of any such certificate,  authority or permit
        that,  if  determined  adversely  to  the  Company,  DTAG  or  any  U.S.
        subsidiary  of  DTAG,  would  individually  or in the  aggregate  have a
        material  adverse  effect on the Company,  DTAG and DTAG's  subsidiaries
        taken as a whole.

               (l)  Except  as set forth in  Schedule  D to this  Agreement  and
        specifically  identified as a labor  dispute,  no labor dispute with the
        employees of the Company,  DTAG or, to the best knowledge of the Company
        or DTAG, DTAG's  subsidiaries exists or in any case, to the knowledge of
        the  Company or DTAG,  is  imminent  that might have a material  adverse
        effect on the Company, DTAG and DTAG's subsidiaries taken as a whole.

               (m) Except as disclosed in the Offering  Document or as set forth
        in Schedule D to this Agreement,  there are no pending actions, suits or
        proceedings  against  or  affecting  the  Company,  DTAG or, to the best
        knowledge of the Company or DTAG, any U.S. subsidiary of DTAG, or any of
        their  respective  properties  that,  if  determined  adversely  to  the
        Company,  DTAG or any subsidiaries of DTAG, would individually or in the
        aggregate have a material adverse effect on the condition  (financial or
        other),  business  or results of  operations  of the  Company,  DTAG and
        DTAG's  subsidiaries taken as a whole, or would materially and adversely
        affect the  ability of the  Company or DTAG to perform  its  obligations
        under (as applicable)  this Agreement or the other Related  Documents to
        which it is a party,  or which are otherwise  material in the context of
        the  sale of the  Offered  Securities;  and no such  actions,  suits  or
        proceedings  are  threatened  or, to the Company's or DTAG's  knowledge,
        contemplated.

               (n) The financial  statements provided to the Initial Purchasers,
        as  specified  in Schedule C of this  Agreement,  present  fairly in all
        material  respects the financial  position of DTAG and its  consolidated
        subsidiaries  (including  the  Company)  as of the dates shown and their
        results of operations and cash flows for the periods shown,  and, except
        as  otherwise  disclosed  in  the  Offering  Document,   such  financial
        statements  have been prepared in  conformity  with  generally  accepted
        accounting  principles  in the United  States  applied  on a  consistent
        basis.

               (o) Since the date of the latest audited  consolidated  financial
        statements provided to the Initial Purchasers,  as specified in Schedule
        C of this Agreement,  there has been no material  adverse change nor any
        development or event known to the Company or DTAG that in the reasonable
        expectation of the Company or DTAG shall cause a material adverse change
        in the condition (financial or other),  business,  properties or results
        of  operations  of the  Company  and  DTAG as a whole,  DTAG and  DTAG's
        subsidiaries   taken  as  a  whole,  and,  except  as  disclosed  in  or
        contemplated  by the  Offering  Document,  there has been no dividend or
        distribution  of any kind declared,  paid or made by the Company or DTAG
        on any class of its capital stock.

               (p)  Neither  the  Company  nor  DTAG is an  open-end  investment
        company,  unit investment trust or face-amount  certificate company that
        is or is required to be registered  under Section 8 of the United States
        Investment Company Act of 1940 (the "Investment Company Act"), nor is it
        a closed-end

                                            -4-






        investment  company  required  to be  registered,  but  not  registered,
        thereunder; and neither the Company nor DTAG is and, after giving effect
        to the offering and sale of the Offered  Securities and the  application
        of the proceeds thereof as described in the Offering  Document,  neither
        will be an  "investment  company" as defined in the  Investment  Company
        Act.

               (q) No  securities  of the same class (within the meaning of Rule
        144A(d)(3) under the Securities Act) as the Offered Securities are:

                      (i) listed on any national  securities exchange registered
               under  Section  6 of the  Securities  Exchange  Act of  1934,  as
               amended  (the  "Exchange  Act")  or  quoted  in a U.S.  automated
               inter-dealer quotation system; or

                      (ii) convertible or exchangeable into securities so listed
               or quoted at the time of issuance.

               (r) The offer and sale of the Offered  Securities  by the Company
        to the Initial  Purchasers in the manner  contemplated by this Agreement
        will be exempt from the registration  requirements of the Securities Act
        and it is not necessary to qualify the Indenture under the United States
        Trust Indenture Act of 1939, as amended (the "Trust Indenture Act").

               (s)  Neither  the  Company,  nor any of its  affiliates,  nor any
        person acting on its or their behalf:

                      (i) has,  within the  six-month  period  prior to the date
               hereof,  offered  or sold in the  United  States  or to any  U.S.
               person  (as such  terms are  defined  in  Regulation  S under the
               Securities  Act) the Offered  Securities  or any  security of the
               same class or series as the Offered Securities; or

                      (ii)  has  offered  or  will  offer  or sell  the  Offered
               Securities by means of any directed  selling  efforts  within the
               meaning  of  Rule  902(b)  of  Regulation  S  ("Directed  Selling
               Efforts"),  including  specifically,  any activity undertaken for
               the purpose of, or that could  reasonably be expected to have the
               effect of,  conditioning  the market in the United States for any
               of  the  Offered  Securities,  including,  but  not  limited  to,
               placement of an  advertisement,  including  without  limitation a
               "tombstone",  that  refers  to  this  Agreement  or  the  Offered
               Securities  issued and sold  pursuant  hereto in any  publication
               that is either printed  primarily for  distribution in the United
               States or has had,  during the twelve (12) months  preceding  the
               date of this  Agreement,  an  average  circulation  in the United
               States of 15,000 or more  copies per issue,  except as  otherwise
               permitted by Regulation S promulgated  under the Securities  Act;
               or

                      (iii) has offered or sold,  or will offer or sell,  any of
               the Offered Securities to any person in the United States, except
               as permitted under  Regulation S or to persons who the Company or
               such  affiliate or person  acting on its behalf,  as  applicable,
               believes are qualified institutional buyers within the meaning of
               Rule 144A ("Rule 144A"),  in accordance with the  requirements of
               such Rule; or

                      (iv) has  offered or will offer to sell any of the Offered
               Securities  by  means  of any  form of  general  solicitation  or
               general  advertising  (as those  terms are used in  Regulation  D
               under the Securities Act), including, but not limited to:

                             (A) any advertisement,  article,  notice (except in
                      accordance with Rule 135c promulgated under the Securities
                      Act) or other  communication  published in any  newspaper,
                      magazine, or similar media or broadcast over television or
                      radio; and

                                            -5-






                             (B) any  seminar or meeting  whose  attendees  have
                      been  invited  by  any  general  solicitation  or  general
                      advertising,  or in any manner involving a public offering
                      within the meaning of Section 4(2) of the Securities  Act.
                      The  Company  has not  entered and will not enter into any
                      contractual  arrangement  with respect to the distribution
                      of the Offered Securities except for this Agreement.

        3. Purchase,  Sale and Delivery of Offered  Securities.  On the basis of
the representations, warranties and agreements in this Agreement, but subject to
the terms and  conditions in this  Agreement,  the Company agrees to sell to the
Initial  Purchasers,  and the Initial  Purchasers  agrees to  purchase  from the
Company,  the principal amount of each class of Offered Securities  specified in
Schedule A to this  Agreement,  at the respective  purchase  price  specified in
Schedule A with respect to each such class.

        The Company  will  deliver  against  payment of the  purchase  price the
Offered  Securities  initially  represented by one or more global  Securities in
definitive  form  (the  "Global  Securities"),  deposited  with the  Trustee  as
custodian  for The  Depository  Trust  Company  ("DTC")  and, in the case of the
Global  Securities  to be sold in the United  States,  registered in the name of
Cede & Co.,  as  nominee  for DTC or, in the case of Global  Securities  sold in
offshore  transactions,  registered  in the  name  of a  nominee  of DTC for the
accounts of the Euroclear  System  ("Euroclear")  and  Cedelbank  ("Cedelbank").
Interests in any Global  Security will be held only in  book-entry  form through
DTC,  except in the limited  circumstances  described in the Offering  Document.
Payment for the Offered  Securities  shall be made by the Initial  Purchasers in
Federal (same day) funds by wire  transfer to an account in New York  previously
designated to the Initial  Purchasers by the Company at a bank acceptable to the
Initial  Purchasers or official check or checks drawn to the order of Rental Car
Finance Corp. at the office of Mayer,  Brown & Platt,  1675 Broadway,  New York,
New York 10019,  at 11:00 A.M.  (New York time),  on April 29, 1999,  or at such
other time not later than seven (7) full business days thereafter as the Initial
Purchasers and the Company determine,  such time being herein referred to as the
"Closing  Date",  against  delivery to the Trustee as  custodian  for DTC of the
Global  Securities  representing  all  of the  Offered  Securities.  The  Global
Securities  will be made  available for inspection at the above office of Mayer,
Brown & Platt at least 24 hours prior to the Closing Date.

        4.  Representation  by  the  Initial Purchasers;  Resale  by the Initial
Purchasers.  

        (a)  Each of the  Initial  Purchasers  represents  and  warrants  to the
Company  and  DTAG  that  it is an  "accredited  investor"  as  defined  in Rule
501(a)(1) under the Securities Act.

        (b)  Each  of the  Initial  Purchasers  acknowledges  that  the  Offered
Securities have not been and will not be registered  under the Securities Act or
any state  securities  laws and may not be  offered  or sold  within  the United
States  or to,  or for the  account  or  benefit  of,  U.S.  persons  except  in
accordance with  Regulation S or pursuant to an exemption from the  registration
requirements of the Securities Act.

          Each of the Initial Purchasers severally represents and agrees that it
has offered and sold the Offered  Securities and will offer and sell the Offered
Securities:

               (i) as part of their distribution at any time; and

               (ii) otherwise  until  forty  (40) days  after the  later  of the
          commencement of the offering and the Closing Date,

only in accordance with Rule 144A or Rule 903 under the Securities Act.

          Accordingly, each Initial Purchaser severally represents and agrees on
behalf of itself that neither such Initial Purchaser nor its affiliates, nor any
persons acting on its or their behalf, have engaged or will engage in

                                            -6-






any Directed  Selling Efforts with respect to the Offered  Securities,  and each
Initial  Purchaser  agrees that it and its  affiliates and all persons acting on
its or their behalf have complied and will comply with the offering restrictions
requirement of Regulation S.

          Each Initial  Purchaser  agrees that, at or prior to  confirmation  of
sale of the Offered  Securities,  the Initial  Purchasers will have sent to each
distributor,  dealer or person  receiving  a  selling  concession,  fee or other
remuneration that purchases the Offered Securities from it during the restricted
period a confirmation or notice to substantially the following effect:

               "The  Securities  covered  hereby  have  not been and will not be
               registered under the U.S. Securities Act of 1933, as amended (the
               "Securities  Act")  and may not be  offered  or sold  within  the
               United  States or to, or for the  account  or  benefit  of,  U.S.
               persons  (i) as part of  their  distribution  at any time or (ii)
               otherwise  until  forty  (40) days after the later of the date of
               the commencement of the offering and the closing date,  except in
               either  case in  accordance  with  Regulation  S (or Rule 144A if
               available)  under the  Securities  Act. Terms used above have the
               meanings given to them by Regulation S."

        Terms used in this  subsection  (b) have the  meanings  given to them by
Regulation S.

        (c)  Each of the  Initial  Purchasers  agrees  that  it and  each of its
affiliates has not entered and will not enter into any  contractual  arrangement
with respect to the distribution of the Offered  Securities  except for any such
arrangements with the prior written consent of the Company.

        (d)  Each of the  Initial  Purchasers  agrees  that  it and  each of its
affiliates will not offer or sell the Offered Securities by means of any form of
general solicitation or general  advertising,  within the meaning of Rule 502(c)
under the Securities Act, including, but not limited to:

               (i) any  advertisement,  article,  notice or other  communication
        published in any newspaper,  magazine or similar media or broadcast over
        television or radio; or

               (ii) any seminar or meeting whose  attendees have been invited by
        any general solicitation or general advertising.

         Each of the  Initial  Purchasers  severally  agrees,  with  respect  to
resales  made in  reliance  on Rule 144A of any of the  Offered  Securities,  to
deliver  either  with the  confirmation  of such  resale or  otherwise  prior to
settlement of such resale a notice to the effect that the resale of such Offered
Securities  has been made in reliance upon the exemption  from the  registration
requirements of the Securities Act provided by Rule 144A.

        (e)  Each of the  Initial  Purchasers  represents  and  warrants  to the
Company and DTAG and agrees that (i) it has not offered or sold and prior to the
date six (6) months  after the  Closing  Date will not offer or sell any Offered
Securities to persons in the United  Kingdom  except to persons  whose  ordinary
activities  involve  them  in  acquiring,  holding,  managing  or  disposing  of
investments  (as  principal  or agent) for the purposes of their  businesses  or
otherwise  in  circumstances  which have not  resulted and will not result in an
offer to the  public in the  United  Kingdom  within  the  meaning of the Public
Offers of Securities Regulations 1995; (ii) it has complied and will comply with
all  applicable  provisions of the  Financial  Services Act 1986 with respect to
anything done by it in relation to the Offered  Securities in, from or otherwise
involving  the United  Kingdom;  and (iii) it has only  issued or passed on, and
will only issue or pass on, in the United Kingdom any document received by it in
connection with the issue of the Offered Securities to a person who is of a kind
described  in  Article  11(3) of the  Financial  Services  Act 1986  (Investment
Advertisements) (Exemptions) Order 1995 or is a person to whom such document may
otherwise lawfully be issued or passed on.


                                            -7-






        5. Certain  Agreements of the Company and DTAG.  Each of the Company and
DTAG agrees with the Initial Purchasers that:

               (a)  The  Company  and  DTAG  will  advise  each  of the  Initial
        Purchasers  promptly of any proposal to amend or supplement the Offering
        Document and will not effect such amendment or  supplementation  without
        each of the Initial  Purchasers'  consent.  If, at any time prior to the
        completion of the resale by the Initial  Purchasers in the  distribution
        of the Offered  Securities by the Initial Purchasers any event occurs as
        a result of which the Offering  Document as then amended or supplemented
        would  include an untrue  statement of a material  fact or omit to state
        any material fact necessary in order to make the statements  therein, in
        the  light  of  the  circumstances  under  which  they  were  made,  not
        misleading,  or if it  is  necessary  at  any  such  time  to  amend  or
        supplement the Offering  Document to comply with any applicable law, the
        Company and DTAG  promptly  will notify the Initial  Purchasers  of such
        event and promptly will prepare,  at their own expense,  an amendment or
        supplement  which will correct such statement or omission or effect such
        compliance.  Neither the Initial Purchasers' consent to, nor the Initial
        Purchasers'  delivery to offerees or investors of, any such amendment or
        supplement  shall constitute a waiver of any of the conditions set forth
        in Section 6 of this Agreement.

               (b) The Company and DTAG  authorize  the  Initial  Purchasers  to
        deliver to  prospective  subsequent  purchasers  copies of the  Offering
        Document,  any  amendments,  supplements  or exhibits  thereto,  and any
        information obtained pursuant to this Agreement,  in connection with any
        reoffer or resale of the Offered Securities by the Initial Purchasers in
        accordance with this Agreement,  and agree that any subsequent purchaser
        may rely on the  representations of the Company and DTAG set out in this
        Agreement  to the same  extent as if such  subsequent  purchaser  were a
        party to this Agreement.

               (c) Until such time as each of the Initial  Purchasers shall have
        resold in the distribution all Offered Securities purchased by it on the
        Closing  Date,  the  Company  and  DTAG  will  provide  to  the  Initial
        Purchasers and any prospective  subsequent  purchaser the opportunity to
        ask questions and receive answers concerning the terms and conditions of
        the offering of the Offered  Securities,  the  condition  (financial  or
        otherwise) of the Company or DTAG and any other matters  relating to the
        matters   described  in  the  Offering  Document  and  the  transactions
        contemplated by this Agreement and to obtain any additional  information
        and documents that the Company or DTAG possesses or can acquire  without
        unreasonable  effort or expense  with  respect  to any of the  foregoing
        other  than  information  and  documents  reasonably  determined  by the
        Company or DTAG,  as the case may be, to be  confidential  in nature and
        not  appropriate  for  disclosure  to  the  Initial   Purchasers  or  to
        prospective  purchasers.  Each of the Initial  Purchasers shall promptly
        notify the Company and DTAG as to the  completion  of the resale by that
        Initial Purchaser in the distribution of the Offered Securities.

               (d) The Company or DTAG (as  requested)  will  furnish to each of
        the Initial Purchasers,  without charge,  copies of any component of the
        Offering Document and all exhibits,  amendments and supplements thereto,
        in each case as soon as available and in such  reasonable  quantities as
        each of the Initial Purchasers requests, and the Company will furnish to
        each of the Initial  Purchasers  on the date hereof  three copies of the
        Offering  Document.  At any time  when the  Company  is not  subject  to
        Section 13 or 15(d) of the  Exchange  Act,  the  Company  will  promptly
        furnish or cause to be furnished  to the Initial  Purchasers  and,  upon
        request of holders and prospective purchasers of the Offered Securities,
        to such holders and purchasers, copies of the information required to be
        delivered  to  holders  and   prospective   purchasers  of  the  Offered
        Securities  pursuant to Rule 144A(d)(4) under the Securities Act (or any
        successor  provision  thereto) in order to permit  compliance  with Rule
        144A  in  connection  with  resales  by  such  holders  of  the  Offered
        Securities.  The  Company  and DTAG,  jointly  and  severally,  shall be
        obligated  to pay the  expenses  of  printing  and  distributing  to the
        Initial Purchasers all such documents.


                                            -8-






               (e) The Company will arrange for the qualification of the Offered
        Securities  for sale and the  determination  of  their  eligibility  for
        investment under the laws of such states in the United States as each of
        the Initial Purchasers  designates and will continue such qualifications
        in effect so long as required  for the resale of the Offered  Securities
        by the Initial Purchasers provided that the Company will not be required
        to  qualify  as a foreign  corporation  or to file a general  consent to
        service  of process in any such  state  unless so  required  in order to
        perform fully its  obligations  under the Indenture and the Master Lease
        (as defined in the Series 1999-1 Supplement).

               (f) For a  period  from  the  date of this  Agreement  until  the
        retirement  of  the  Offered   Securities,   DTAG  or  the  Company,  as
        applicable,  will furnish to each of the Initial  Purchasers,  copies of
        each report and certificate and any financial  information  delivered to
        the Trustee  pursuant to Sections 5.4 and 7.3 of the Base  Indenture and
        Section  24.4 of the Master  Lease  (except  that Daily  Reports will be
        furnished to the Initial Purchasers only upon request thereby), and such
        other forms of periodic  certificates  or reports as may be delivered to
        the Trustee or the holders of Offered  Securities under the Indenture or
        other Related Documents.

                (g) During the period of two (2) years after the  Closing  Date,
        the Company will, upon request,  furnish to the Initial Purchasers,  and
        any holder of Offered  Securities a copy of the restrictions on transfer
        applicable to the Offered Securities.

               (h) During the period of two (2) years  after the  Closing  Date,
        the  Company  will not,  and will not permit any of its  affiliates  (as
        defined  in Rule 144 under the  Securities  Act) to,  resell  any of the
        Offered Securities that have been reacquired by any of them.

               (i) During the period of two (2) years  after the  Closing  Date,
        neither  DTAG nor the Company  will be or become an open-end  investment
        company,  unit investment trust or face-amount  certificate company that
        is or is required to be  registered  under  Section 8 of the  Investment
        Company  Act,  and  neither  is,  nor will be or  become,  a  closed-end
        investment company required to be registered, but not registered,  under
        the Investment Company Act.

               (j) The Company and DTAG,  jointly and  severally,  shall pay all
        expenses  incidental to the performance of their respective  obligations
        under this  Agreement  and the Series 1999-1  Supplement,  including all
        expenses in connection  with the  execution,  issuance,  authentication,
        packaging  and  initial   delivery  of  the  Offered   Securities,   the
        preparation and printing of this Agreement, the Offered Securities,  the
        Series  1999-1  Supplement,  the Offering  Document and  amendments  and
        supplements  thereto,  and any other document  relating to the issuance,
        offer,  sale and  delivery  of the Offered  Securities.  The Company and
        DTAG,  jointly  and  severally,  shall  reimburse  each  of the  Initial
        Purchasers  for any  expenses  (other  than  fees and  disbursements  of
        special  counsel to the Initial  Purchasers)  incurred  by that  Initial
        Purchaser in connection with qualification of the Offered Securities for
        sale  under the laws of such  jurisdictions  as each  Initial  Purchaser
        designates  and the printing of memoranda  relating  thereto and for any
        fees  charged  by  investment  rating  agencies  for the  rating  of the
        Securities.

               Notwithstanding  the foregoing,  the Initial Purchasers shall pay
        and bear (i) all reasonable  fees and expenses of Mayer,  Brown & Platt,
        special  counsel  to the  Initial  Purchasers,  charged or  incurred  in
        connection with the offering and purchase of the Offered  Securities and
        (ii) all out of pocket  expenses  of the Initial  Purchasers,  including
        (without  limitation)  all travel  expenses of the  Initial  Purchasers'
        officers and employees and any other expenses of the Initial  Purchasers
        in  connection  with  attending  or hosting  meetings  with  prospective
        purchasers of the Offered Securities.

               (k) In connection  with the  offering,  until each of the Initial
        Purchasers shall have notified the Company and DTAG of the completion of
        the resale by that Initial Purchaser in the distribution of the

                                            -9-







        Offered  Securities,  neither  the  Company  nor  DTAG  nor any of their
        affiliates has or will,  either alone or with one or more other persons,
        bid for or purchase for any account in which it or any of its affiliates
        has a beneficial  interest any Offered  Securities  or attempt to induce
        any person to purchase any Offered  Securities;  and neither the Company
        nor DTAG nor any of its  affiliates  will make bids or purchases for the
        purpose of  creating  actual,  or  apparent,  active  trading  in, or of
        raising the price of, the Offered Securities.

               (l) For a  period  of  thirty  (30)  days  after  the date of the
        initial  offering of the Offered  Securities by the Initial  Purchasers,
        the  Company  will  not  without  the  consent  of each  of the  Initial
        Purchasers offer,  sell,  contract to sell, pledge, or otherwise dispose
        of, directly or indirectly,  any United States  dollar-denominated  debt
        securities  issued or guaranteed by the Company and having a maturity of
        more than one (1) year from the date of issue.  The Company  will not at
        any time offer, sell,  contract to sell, pledge or otherwise dispose of,
        directly or indirectly,  any securities under  circumstances  where such
        offer, sale,  pledge,  contract or disposition would cause the exemption
        afforded by Section 4(2) or Regulation D of the  Securities Act to cease
        to be applicable to the offer and sale of the Offered  Securities to the
        Initial Purchasers.

               (m) To the extent,  if any, that the rating provided with respect
        to the Offered  Securities  by Duff & Phelps  Credit  Rating Co., or its
        successors and assigns ("DCR"),  Moody's Investors Service, Inc., or its
        successors  and  assigns  ("Moody's")  and  Standard  &  Poor's  Ratings
        Services,  or its  successors  and  assigns  ("Standard  & Poor's"  and,
        together with DCR and Moody's,  the "Rating  Agencies")  is  conditional
        upon the  furnishing  of documents or the taking of any other actions by
        the Company  and/or  DTAG,  the Company  and/or DTAG shall  furnish such
        documents and take any such other action.

               (n) The Company and DTAG shall furnish, or cause to be furnished,
        or make  available,  or  cause  to be  made  available,  to the  Initial
        Purchasers and their counsel such  additional  documents and information
        regarding it and its affairs as the Initial  Purchasers may from time to
        time reasonably request,  including any and all documentation reasonably
        requested  in  connection  with  its  due  diligence  efforts  regarding
        information  in the  Offering  Document  and to evidence the accuracy or
        completeness of any of the conditions contained in this Agreement.

               (o) The  Company  and/or  DTAG,  as the case may be, will pay all
        expenses  incident  to the  performance  of its  obligations  under this
        Agreement  and will  reimburse  the  Initial  Purchasers  (if and to the
        extent  incurred by the Initial  Purchasers) for any fees charged by the
        Rating Agencies for the rating of the Offered Securities, for any travel
        expenses of the Company's  and/or DTAG's  officers and employees and any
        other expenses of the Company  and/or DTAG in connection  with attending
        or  hosting  meetings  with   prospective   purchasers  of  the  Offered
        Securities  and for  expenses  incurred  in  distributing  the  Offering
        Document (including any amendments and supplements thereto).

        6.  Conditions  of  the  Obligations  of  the  Initial  Purchasers.  The
obligations  of the  Initial  Purchasers  to  purchase  and pay for the  Offered
Securities will be subject to the accuracy of the representations and warranties
on the part of the Company and DTAG in this  Agreement,  to the  accuracy of the
statements of officers of the Company and DTAG made  pursuant to the  provisions
of this Agreement, to the performance by the Company and DTAG of its obligations
under this Agreement and to the following additional conditions precedent:

               (a) Each of the Initial  Purchasers shall have received a letter,
        dated the date of this  Agreement,  of Deloitte & Touche LLP in form and
        substance   satisfactory  to  the  Initial  Purchasers   concerning  the
        accounting,  financial and statistical  information  with respect to the
        Company set forth in the  Offering  Document  and, if  practicable,  the
        Additional Issuer Information.

               (b)  Subsequent to the execution and delivery of this  Agreement,
there shall not have occurred:

                                            -10-







                      (i) a change in U.S. or international financial, political
               or economic  conditions  or currency  exchange  rates or exchange
               controls as would, in the judgment of the Initial Purchasers,  be
               likely to prejudice materially the success of the proposed issue,
               sale or  distribution of the Offered  Securities,  whether in the
               primary market or in respect of dealings in the secondary market;
               or

                      (ii) any change,  or any  development or event involving a
               prospective  change,  in  the  condition  (financial  or  other),
               business,  properties  or results of  operations  of the Company,
               DTAG or DTAG's subsidiaries which, in the judgment of the Initial
               Purchasers,  is material and adverse and makes it  impractical or
               inadvisable  to proceed  with  completion  of the offering or the
               sale of and payment for the Offered Securities; or

                      (iii) any downgrading in the rating of any debt securities
               of the Company by any "nationally  recognized  statistical rating
               organization"  (as defined for  purposes of Rule 436(g) under the
               Securities  Act),  or  any  public  announcement  that  any  such
               organization  has under  surveillance or review its rating of any
               debt securities of the Company (other than an  announcement  with
               positive implications of a possible upgrading, and no implication
               of a possible downgrading, of such rating); or

                      (iv) any suspension or limitation of trading in securities
               generally  on the New  York  Stock  Exchange  or any  setting  of
               minimum prices for trading on such exchange; or

                      (v)  any  banking  moratorium  declared  by  U.S. Federal,
               New York or Oklahoma authorities; or

                      (vi) any outbreak or  escalation of major  hostilities  in
               which the United States is involved,  any  declaration  of war by
               Congress  or any  other  substantial  national  or  international
               calamity  or  emergency  if,  in  the  judgment  of  the  Initial
               Purchasers,   the  effect  of  any  such  outbreak,   escalation,
               declaration,  calamity  or  emergency  makes  it  impractical  or
               inadvisable to proceed with completion of the offering or sale of
               and payment for the Offered Securities.

               (c) Each of the Initial  Purchasers shall have received  evidence
        satisfactory to it, and its counsel, that on or before the Closing Date,
        UCC-1  financing  statements  required  to be  filed  on or prior to the
        Closing Date  pursuant to the Related  Documents  have been or are being
        filed  in the  office  of the  Oklahoma  County  Clerk  of the  State of
        Oklahoma or in any other applicable offices and jurisdictions.

               (d) Each of the Initial Purchasers shall have received an opinion
        of Hall, Estill, Hardwick,  Gable, Golden & Nelson P.C., counsel for the
        Company and DTAG,  dated the Closing  Date and  addressed to the Initial
        Purchasers,  regarding general corporate matters,  in form and substance
        satisfactory to each of the Initial Purchasers and its counsel.

               (e) Each of the Initial Purchasers shall have received an opinion
        of Hall, Estill,  Hardwick,  Gable, Golden & Nelson P.C., counsel to the
        Company and DTAG,  dated the Closing  Date and  addressed to each of the
        Initial Purchasers,  regarding  perfection and priority matters, in form
        and substance  satisfactory  to each of the Initial  Purchasers  and its
        counsel.

               (f) Each of the Initial  Purchasers shall have received  opinions
        of Mayer, Brown & Platt, dated the Closing Date and addressed to each of
        the Initial Purchasers, regarding:

                       (i)(x) substantive  consolidation  of   the  assets   and
               liabilities  of  the  Company  and  any  of  its  affiliates  (y)
               preference matters;

                                            -11-







                      (ii) a letter confirming that the opinion of Mayer,  Brown
               & Platt,  dated December 23, 1997, opining that the Master Lease,
               with respect to Acquired Vehicles (as such term is defined in the
               Series 1999-1  Supplement),  was a "true lease,"  continues to be
               correct as of the Closing Date;

                       (iii) enforceability and securities law matters; and

                       (iv) certain negative  assurances  concerning the private
               placement memoranda,  each in form and substance  satisfactory to
               the Initial Purchasers.

               (g) Each of the Initial Purchasers shall have received an opinion
        of Mayer,  Brown & Platt in its  capacity as federal  income tax counsel
        for the Company and DTAG,  dated the Closing Date and  addressed to each
        of the Initial  Purchasers,  to the effect that the statements set forth
        in the private placement  memorandum under the headings "Certain Federal
        Income Tax Consequences" accurately describe the material federal income
        tax  consequences  to holders  of the  Offered  Securities,  in form and
        substance satisfactory to the Initial Purchasers and its counsel.

               (h) Each of the Initial Purchasers shall have received an opinion
        from White & Case,  counsel for the  Trustee  and the Master  Collateral
        Agent,  dated the  Closing  Date and  addressed  to each of the  Initial
        Purchasers,  in  form  and  substance  satisfactory  to the  each of the
        Initial Purchasers and its counsel.

               (i) Each of the Initial Purchasers shall have received an opinion
        of Mayer, Brown & Platt, dated the Closing Date and addressed to each of
        the  Initial  Purchasers,  with  respect to the  validity of the Offered
        Securities  and  such  other  matters  as  the  Initial  Purchasers  may
        reasonably request,  and the Company and DTAG, as the case may be, shall
        have  furnished to such counsel  such  documents as they may  reasonably
        request for the purpose of enabling them to pass upon such matters.

               (j)  Each  of  the  Initial  Purchasers  shall  have  received  a
        certificate  or  certificates  signed  by the  President  and  any  Vice
        President and a principal financial or accounting officer of each of the
        Company and DTAG,  dated the Closing Date, in which such officers  shall
        state that, to the best of their knowledge:

                       (i) the representations and warranties of the Company and
               DTAG in this  Agreement and any other Related  Documents to which
               the  Company  and DTAG are a party are true and correct on and as
               of the Closing  Date or, in the case of the  representations  and
               warranties  in the  Related  Documents,  on  and as of the  dates
               specified in such agreements;

                       (ii) that the  Company  and DTAG have  complied  with all
               agreements  and  satisfied  all  conditions  on  its  part  to be
               performed or satisfied  hereunder or under the Related  Documents
               at or prior to the Closing Date;

                       (iii)  subsequent to the date as of which  information is
               given in the Offering  Document,  there has not been any material
               adverse change in the general affairs, business,  properties, key
               personnel, capitalization,  condition (financial or otherwise) or
               results of  operation of the Company and DTAG except as set forth
               or contemplated in the Offering  Document or as described in such
               certificate or certificates; and

                      (iv)  nothing has come to such  officer's  attention  that
               would lead such officer to believe that the  preliminary  private
               placement  memorandum  as of  its  date,  the  private  placement
               memorandum  as of  its  date  and  as of the  Closing  Date,  the
               remaining documents  comprising the Offering Document as of their
               dates and as of, as  applicable,  the date of this  Agreement and
               the  Closing  Date does not or will not on such date  include any
               untrue statement of a material fact or

                                            -12-







               omit to state any  material  fact  necessary in order to make the
               statements therein, in the light of the circumstances under which
               they were made, not misleading.

               (k) The Initial  Purchasers  shall have received a letter,  dated
        the Closing Date, of Deloitte & Touche which meets the  requirements  of
        subsection (a) of this Section,  except that the specified date referred
        to in such  subsection  will be a date not more than five (5) days prior
        to the Closing Date for the purposes of this subsection.

               (l) The Initial Purchasers shall have received a letter from each
        of Standard & Poor's, DCR and Moody's stating (as applicable) that:

                       (i) the Class A Notes (as  defined in the  Series  1999-1
               Supplement)  have  received  a  rating  of at  least  "AAA"  from
               Standard and Poor's and DCR and "Aaa" from Moody's, respectively;

                      (ii) the Class B Notes (as  defined in the  Series  1999-1
               Supplement) have received a rating of at least "AA" from Standard
               & Poor's and DCR, and "Aaa" from Moody's, respectively;

                      (iii) the Class C Notes (as  defined in the Series  1999-1
               Supplement)  have received a rating of at least "A" from Standard
               & Poor's and DCR and "A3" from Moody's, respectively; and

                      (iv) the Class D Notes (as  defined in the  Series  1999-1
               Supplement)  have received a rating of at least "BBB" by Standard
               & Poor's and DCR, respectively.

The Company and DTAG will  furnish the Initial  Purchasers  with such  conformed
copies of such  opinions,  certificates,  letters and  documents  as the Initial
Purchasers  reasonably  request.  The  Initial  Purchasers  may  in  their  sole
discretion  waive  on  behalf  of the  Initial  Purchasers  compliance  with any
conditions to the obligations of the Initial Purchasers hereunder.

        7.  Indemnification and Contribution.

               (a) The Company and DTAG shall, jointly and severally,  indemnify
        and hold  harmless the Initial  Purchasers  against any losses,  claims,
        damages  or  liabilities  to which the  Initial  Purchasers  may  become
        subject,  under the  Securities  Act or the Exchange  Act or  otherwise,
        insofar as such losses,  claims,  damages or liabilities  (or actions in
        respect  thereof) arise out of or are based upon any untrue statement or
        alleged untrue  statement of any material fact contained in the Offering
        Document,  or any amendment or  supplement  thereto,  or any  Additional
        Issuer  Information,  or arise out of or are based upon the  omission or
        alleged  omission to state therein a material fact required to be stated
        therein or necessary in order to make the statements  therein,  in light
        of the  circumstances  under which they were made, not  misleading,  and
        shall  reimburse the Initial  Purchasers for any legal or other expenses
        reasonably  incurred  by  the  Initial  Purchasers  in  connection  with
        investigating or defending any such loss,  claim,  damage,  liability or
        action as such expenses are incurred;  provided,  however,  that neither
        the  Company nor DTAG will be liable in any such case to the extent that
        any such loss, claim, damage or liability arises out of or is based upon
        an untrue  statement  or alleged  untrue  statement  in or  omission  or
        alleged  omission  from any of such  documents  in reliance  upon and in
        conformity with written information  furnished to the Company or DTAG by
        the Initial Purchasers specifically for use therein, it being understood
        and agreed that the only such  information  consists of the  information
        described as such in subsection (b) below.


                                            -13-






               (b)  The  Initial  Purchasers  will  severally  and  not  jointly
        indemnify  and hold  harmless  the Company and DTAG  against any losses,
        claims,  damages or  liabilities to which the Company or DTAG may become
        subject,  under the  Securities  Act or the Exchange  Act or  otherwise,
        insofar as such losses,  claims,  damages or liabilities  (or actions in
        respect  thereof) arise out of or are based upon any untrue statement or
        alleged untrue  statement of any material fact contained in the Offering
        Document,  or any amendment or supplement thereto or arise out of or are
        based upon the  omission  or the  alleged  omission  to state  therein a
        material  fact  required to be stated  therein or  necessary in order to
        make the statements  therein,  in the light of the  circumstances  under
        which they were made, not  misleading,  in each case to the extent,  but
        only to the  extent,  that  such  untrue  statement  or  alleged  untrue
        statement or omission or alleged  omission was made in reliance upon and
        in conformity with written information  furnished to the Company or DTAG
        by that  Initial  Purchaser  specifically  for  use  therein,  and  will
        reimburse any legal or other expenses reasonably incurred by the Company
        or DTAG in  connection  with  investigating  or defending any such loss,
        claim,  damage,  liability or action as such expenses are  incurred,  it
        being understood and agreed that the only such information  furnished by
        the  Initial  Purchasers  consists  of the  information  in the  private
        placement  memorandum and the supplement thereto specified in Schedule E
        to this  Agreement.  The  Initial  Purchasers  may,  but  shall  have no
        obligation  to,  make a market in the Offered  Securities,  and any such
        market making may be  discontinued at any time,  without notice,  in the
        sole discretion of the Initial Purchasers.

               (c) Promptly  after  receipt by an  indemnified  party under this
        Section 7 of notice of the commencement of any action,  such indemnified
        party  will,  if a claim in respect  thereof is to be made  against  the
        indemnifying  party  under  subsection  (a) or  (b)  above,  notify  the
        indemnifying party of the commencement  thereof;  but the omission so to
        notify the  indemnifying  party will not  relieve it from any  liability
        which  it may  have  to  any  indemnified  party  otherwise  than  under
        subsection (a) or (b) above.  In case any such action is brought against
        any  indemnified  party and it notifies  the  indemnifying  party of the
        commencement  thereof,  the  indemnifying  party  will  be  entitled  to
        participate  therein  and, to the extent that it may wish,  jointly with
        any other indemnifying party similarly  notified,  to assume the defense
        thereof,  with counsel satisfactory to such indemnified party, and after
        notice  from the  indemnifying  party to such  indemnified  party of its
        election so to assume the defense thereof,  the indemnifying  party will
        not be liable to such  indemnified  party  under this  Section 7 for any
        legal or other expenses  subsequently incurred by such indemnified party
        in connection with the defense  thereof other than  reasonable  costs of
        investigation.

        Notwithstanding the indemnifying  party's election to appoint counsel to
        represent the  indemnified  party in an action,  the  indemnified  party
        shall  have the  right  to  employ  separate  counsel  (including  local
        counsel),  and the  indemnifying  party shall bear the reasonable  fees,
        costs and expenses of such separate counsel if:

                      (i) the use of counsel chosen by the indemnifying party to
               represent the indemnified party would present such counsel with a
               conflict of interest;

                      (ii) the actual or potential  defendants in, or targets of
               any such  action  include  both  the  indemnified  party  and the
               indemnifying   party  and  the   indemnified   party  shall  have
               reasonably  concluded that there may be legal defenses  available
               to it and/or other  indemnified  parties which are different from
               or additional to those available to the indemnifying party;

                      (iii)  the  indemnifying  party  shall  not have  employed
               counsel  satisfactory to the  indemnified  party to represent the
               indemnified  party within a  reasonable  time after notice of the
               institution of such action; or

                      (iv)  the   indemnifying   party   shall   authorize   the
               indemnified  party to employ  separate  counsel at the expense of
               the indemnifying party.

                                            -14-






        No  indemnifying  party shall,  without the prior written consent of the
        indemnified  party,  effect any  settlement of any pending or threatened
        action in respect of which any indemnified party is or could have been a
        party and indemnity could have been sought hereunder by such indemnified
        party unless such settlement  includes an unconditional  release of such
        indemnified  party from all liability on any claims that are the subject
        matter of such action.

               (d) If the  indemnification  provided  for in this  Section  7 is
        unavailable or insufficient to hold harmless an indemnified  party under
        subsection  (a)  or  (b)  above,  then  each  indemnifying  party  shall
        contribute to the amount paid or payable by such indemnified  party as a
        result of the  losses,  claims,  damages or  liabilities  referred to in
        subsection (a) or (b) above (i) in such  proportion as is appropriate to
        reflect the  relative  benefits  received by the Company and DTAG on the
        one  hand and the  relevant  Initial  Purchaser  on the  other  from the
        offering of the Offered Securities or (ii) if the allocation provided by
        clause (i) above is not permitted by applicable  law, in such proportion
        as is appropriate to reflect not only the relative  benefits referred to
        in clause (i) above but also the relative  fault of the Company and DTAG
        on the one hand  and the  relevant  Initial  Purchaser  on the  other in
        connection  with the  statements  or  omissions  which  resulted in such
        losses,  claims,  damages or  liabilities  as well as any other relevant
        equitable considerations.  The relative benefits received by the Company
        and DTAG on the one hand and the relevant Initial Purchaser on the other
        shall be deemed to be in the same  proportion  as the total net proceeds
        from the offering (before  deducting  expenses)  received by the Company
        bear to the total  discounts  and  commissions  received by the relevant
        Initial  Purchaser from the Company under this  Agreement.  The relative
        fault shall be determined  by reference to, among other things,  whether
        the  untrue  or  alleged  untrue  statement  of a  material  fact or the
        omission  or  alleged  omission  to state a  material  fact  relates  to
        information  supplied  by the  Company  or DTAG  on the one  hand or the
        relevant  Initial  Purchaser  on the  other  and the  parties'  relative
        intent,  knowledge,  access to information and opportunity to correct or
        prevent  such  untrue  statement  or  omission.  The  amount  paid by an
        indemnified  party  as a  result  of  the  losses,  claims,  damages  or
        liabilities  referred to in the first  sentence of this  subsection  (d)
        shall be  deemed  to  include  any  legal or other  expenses  reasonably
        incurred by such indemnified  party in connection with  investigating or
        defending  any action or claim which is the  subject of this  subsection
        (d).

               Notwithstanding the provisions of this subsection (d), neither of
        the Initial  Purchasers  shall be required to  contribute  any amount in
        excess  of the  amount  by which the  total  discounts  and  commissions
        received  by  that  Initial   Purchaser  with  respect  to  the  Offered
        Securities  exceeds  the  amount  of  any  damages  which  that  Initial
        Purchaser has otherwise been required to pay by reason of such untrue or
        alleged  untrue  statement  or omission or alleged  omission.  No person
        guilty of  fraudulent  misrepresentation  (within the meaning of Section
        11(f) of the Securities Act) shall be entitled to contribution  from any
        person who was not guilty of such fraudulent misrepresentation.

               (e) The  obligations of the Company and DTAG under this Section 7
        shall be in  addition  to any  liability  which the  Company or DTAG may
        otherwise have and shall extend, upon the same terms and conditions,  to
        each person, if any, who controls each of the Initial  Purchasers within
        the  meaning  of the  Securities  Act  or  the  Exchange  Act;  and  the
        obligations of each of the Initial Purchasers under this Section 7 shall
        be in addition to any liability which each of the Initial Purchasers may
        otherwise have and shall extend, upon the same terms and conditions,  to
        each person, if any, who controls the Company or DTAG within the meaning
        of the Securities Act or the Exchange Act.

        8. Survival of Certain  Representations and Obligations.  The respective
indemnities, agreements, representations, warranties and other statements of the
Company,  DTAG or their  respective  officers and of the Initial  Purchasers set
forth in or made  pursuant  to this  Agreement  will  remain  in full  force and
effect, regardless of any investigation, or statement as to the results thereof,
made by or on behalf of the  Initial  Purchasers,  the  Company,  DTAG or any of
their  respective  representatives,  officers or  directors  or any  controlling
person, and

                                            -15-






will  survive  delivery of and payment  for the Offered  Securities.  If for any
reason  the  purchase  of the  Offered  Securities  by  either  of  the  Initial
Purchasers  is not  consummated,  each of the  Company  and  DTAG  shall  remain
responsible  for the expenses to be paid or reimbursed by it pursuant to Section
5 and the respective obligations of the Company, DTAG and the Initial Purchasers
pursuant  to Section 7 shall  remain in effect.  If the  purchase of the Offered
Securities by either of the Initial Purchasers is not consummated for any reason
other than solely  because of the  occurrence  of any event  specified in clause
(i),  (iv), (v) or (vi) of Section 6(b), the Company and DTAG will reimburse the
Initial   Purchasers  for  all  out-of-pocket   expenses   (including  fees  and
disbursements  of counsel)  reasonably  incurred by them in connection  with the
offering of the Offered Securities.

        9. Notices. All communications hereunder will be in writing and, if sent
to Credit  Suisse will be mailed,  delivered  or  telegraphed  and  confirmed to
Credit  Suisse First  Boston  Corporation,  11 Madison  Avenue,  New York,  N.Y.
10010-3629,  Attention:  Investment  Banking  Department  Transactions  Advisory
Group,  or, if sent to Chase,  will be  mailed,  delivered  or  telegraphed  and
confirmed to Chase, c/o Chase  Securities Inc., 270 Park Avenue,  7th Floor, New
York, New York 10017,  Attention:  Global Asset-Backed Department or, if sent to
the Company,  will be mailed,  delivered or  telegraphed  and confirmed to it at
5330 East 31st Street,  Tulsa, Oklahoma 74135,  Attention:  Pamela S. Peck, Vice
President  and  Treasurer  or, if sent to DTAG,  will be  mailed,  delivered  or
telegraphed  and confirmed to at 5330 East 31st Street,  Tulsa,  Oklahoma 74135,
Attention:  Steven B.  Hildebrand,  Vice President and Chief Financial  Officer,
provided, however, that any notice to the Initial Purchasers pursuant to Section
7 will  be  mailed,  delivered  or  telegraphed  and  confirmed  to the  Initial
Purchasers.

        10.  Successors.  This  Agreement  will  inure to the  benefit of and be
binding  upon  the  parties  hereto  and  their  respective  successors  and the
controlling  persons referred to in Section 7, and no other person will have any
right or obligation  hereunder,  except that holders of Offered Securities shall
be entitled to enforce the agreements for their benefit  contained in the second
and third  sentences  of Section  5(d)  hereof  against  the  Company as if such
holders were parties hereto.

        11.  Counterparts.  This  Agreement  may be  executed  in any  number of
counterparts,  each of which  shall be  deemed to be an  original,  but all such
counterparts shall together constitute one and the same agreement.

        12. Construction of Certain Terms. As used herein, the term "to the best
knowledge of the Company or DTAG" means to the best knowledge of the officers of
the Company and DTAG specified in Schedule F hereto.

        13.  APPLICABLE  LAW. THIS AGREEMENT SHALL BE GOVERNED BY, AND CONSTRUED
IN  ACCORDANCE  WITH,  THE  LAWS OF THE  STATE  OF NEW YORK  WITHOUT  REGARD  TO
PRINCIPLES OF CONFLICTS OF LAWS.

        Each of the Company and DTAG and the Initial  Purchasers  hereby submits
to the non-exclusive jurisdiction of the Federal and state courts in the Borough
of Manhattan in The City of New York in any suit or proceeding arising out of or
relating to this Agreement or the transactions contemplated hereby.



                                            -16-








               If the  foregoing  is in  accordance  with  the  each of  Initial
        Purchasers'  understanding  of our agreement,  kindly sign and return to
        the Company and to DTAG one of the  counterparts  hereof,  whereupon  it
        will become a binding agreement among the Company,  DTAG and each of the
        Initial Purchasers in accordance with its terms.

                Very truly yours,

                       RENTAL CAR FINANCE CORP.



                       By.......................................................
                          Name: Pamela S. Peck
                          Title: Vice President and Treasurer



                       DOLLAR THRIFTY AUTOMOTIVE GROUP, INC.



                       By.......................................................
                          Name:
                          Title:

                                            -17-






The foregoing Note Purchase Agreement is hereby confirmed and accepted as of the
date first above written.


               Credit Suisse First Boston Corporation


               By..................................................
                 Name:
                 Title:


The foregoing Note Purchase Agreement is hereby confirmed and accepted as of the
date first above written.


               Chase Securities Inc.


               By..................................................
                 Name:
                 Title:


                                            -18-






                                   SCHEDULE A




         Principal Amount of                          Purchase
          Offered Securities                            Price
- --------------------------------------              ------------

$175,000,000 principal amount of its Series
1999-1 5.90% Rental Car Asset Backed                99.859375%
Notes, Class A

$20,000,000 principal amount of its Series 
1999-1 6.20% Rental Car Asset Backed                99.906250%
Notes, Class B

$42,500,000 principal amount of its Series 
1999-1 6.50% Rental Car Asset Backed                99.953125%
Notes, Class C

$12,500,000 principal amount of its Series 
1999-1 7.10% Rental Car Asset Backed                99.781250%
Notes, Class D                             



                                            -19-






                                   SCHEDULE B

                              Additional Documents


                                      NONE




                                            -20-






                                   SCHEDULE C

                              Financial Statements


                   [Audited consolidated financial statements]


                                            -21-







                                   SCHEDULE D

                  Labor Disputes and Other Pending Proceedings


        Dollar Thrifty Automotive Group, Inc.
        -------------------------------------

        NONE

        Rental Car Finance Corp.
        ------------------------

        NONE

        Dollar Rent A Car Systems, Inc.
        -------------------------------

               On November 2, 1994,  the City of San Jose,  California  filed an
action in the Superior Court of California,  against Chevron, Dollar and others,
seeking unspecified compensatory and punitive damages and injunctive relief. The
City of San Jose has not served process on Dollar. The suit relates to pollution
at a site currently occupied by Dollar and formerly occupied by Chevron.  Dollar
has partially  remediated  the affected  soil,  but not the  allegedly  affected
ground  water.  Dollar  believes  that  prior uses of the site  resulted  in any
remaining contamination at the site.

               On October 2, 1997,  a purported  class  action suit was filed in
the Circuit Court of Coosa County,  Alabama,  against Dollar,  Thrifty and other
car rental  companies.  The plaintiffs in this suit alleged  violations of state
law in connection with the sale by the car rental companies of certain insurance
products.  Dollar and Thrifty have filed answers denying the alleged violations.
The case has been removed to the U.S.  District Court for the Middle District of
Alabama.  Plaintiffs filed an amended  complaint on February 16, 1998,  dropping
their fraud allegations, but adding a claim for a refund of the amounts paid for
insurance.  Dollar,  Thrifty  and other car rental  companies  filed a motion to
dismiss the conspiracy  claim portion of the suit,  which dismissal was granted.
On April 10, 1999 the Court  dismissed the case in its entirety with  prejudice.
Plaintiffs intend to appeal.

        Thrifty Rent-A-Car System, Inc.
        -------------------------------

        SEE DESCRIPTION OF COOSA COUNTY, ALABAMA CASE DESCRIBED ABOVE.




                                            -22-







                                   SCHEDULE E

                   Information Provided by Initial Purchasers

The  information  provided by the Initial  Purchasers  consists of the following
paragraphs in the final private placement memorandum and supplement to the final
private placement memorandum, both dated April 21, 1999:


        (1) the  first two  sentences  of the last  paragraph  at the end of the
inside of the front cover page of the supplement to the final private  placement
memorandum concerning the terms of the offering by the Initial Purchasers;

        (2) the legend concerning over-allotments and stabilizing on page S-5 of
the supplement to the final private placement memorandum;

        (3) the  second  sentence  of the  second  paragraph  in the  "Method of
Distribution"   section  of  the  supplement  to  the  final  private  placement
memorandum;

        (4) the fourth,  fifth,  seventh and eighth paragraphs in the "Method of
Distribution"   section  of  the  supplement  to  the  final  private  placement
memorandum;

        (5) the next to last sentence in the  "Restrictions on Transfer" section
of "Risk Factors" on page 24 of the final private placement memorandum; and

        (6) the fifth paragraph and the second sentence of the seventh paragraph
in  the  "Method  of  Distribution"  section  in  the  final  private  placement
memorandum.


                                            -23-






                                   SCHEDULE F

                               Specified Officers
                               ------------------


        The Company:

        1. Pamela S. Peck
        2. Michael H. McMahon
        3. Stephen W. Ray


        DTAG:

        1. Steven B.  Hildebrand
        2. Pamela S. Peck
        3. Stephen W. Ray
        4. Michael H. McMahon



                                            -24-