Document:

Exhibit 10.26

             CONFIDENTIAL TREATMENT HAS BEEN REQUESTED FOR CERTAIN
           PORTIONS OF THIS DOCUMENT. CONFIDENTIAL PORTIONS HAVE BEEN
               FILED WITH THE SECURITIES AND EXCHANGE COMMISSION.

THE WARRANT ISSUED PURSUANT TO THIS PARTICIPATION WARRANT AGREEMENT HAS NOT BEEN
REGISTERED UNDER THE SECURITIES ACT OF 1933 OR ANY STATE SECURITIES LAWS. IT MAY
NOT BE SOLD OR OFFERED FOR SALE, PLEDGED, HYPOTHECATED OR OTHERWISE TRANSFERRED
IN THE ABSENCE OF AN EFFECTIVE REGISTRATION STATEMENT UNDER SAID ACT AND
APPLICABLE STATE SECURITIES LAWS UNLESS THE COMPANY HAS RECEIVED AN OPINION OF
COUNSEL REASONABLY SATISFACTORY TO THE COMPANY THAT SUCH REGISTRATION IS NOT
REQUIRED TO EFFECTUATE SUCH TRANSACTION.

                         PARTICIPATION WARRANT AGREEMENT
                       To Purchase Shares of Common Stock
                          Dated as of November 17, 1999
                           PRICELINE.COM INCORPORATED
                             a Delaware Corporation

                                                   Issue Date: November 17, 1999

THIS CERTIFIES THAT, Trans World Airlines, Inc. (the "Warrant Holder"), with a
place of business at One City Centre, 515 North 6th, Saint Louis, Missouri
63101, for value received, is entitled, upon the terms and subject to the
conditions of this Participation Warrant Agreement (this "Warrant Agreement"),
to subscribe for and purchase fully-paid and non-assessable shares of common
stock, par value $.008 per share (the "Common Stock"), of priceline.com
Incorporated, a Delaware corporation (the "Company").

      1. Issuance of Warrants. On the Issue Date, the Company will issue to the
Warrant Holder warrants (the "Warrants") to acquire Five Hundred Thousand
(500,000) shares of the Common Stock (the "Shares"), subject to adjustment as
hereinafter provided pursuant to Section 10 herein.

      2. Exercise Price. The Warrants have an exercise price of $59.93 per share
of Common Stock, as adjusted pursuant to the provisions of Section 10 of this
Warrant Agreement (the "Exercise Price").

      3. Term. The Warrants are fully vested on the Issue Date. Except as
otherwise provided herein, the term of the Warrants and the right to purchase
Shares as granted herein shall be exercisable on the fifth (5th) anniversary of
the Issue Date; provided, further, that if any of the Warrants first become
exercisable on the fifth (5th) anniversary of the Issue Date, the Warrant Holder
will have an additional six months thereafter to exercise its purchase rights in
respect of those Warrants (the end of such five year period and additional six
months, if applicable, being referred to herein as the "Termination Date").

      4. Exercise Events.

            (a) General. Unless otherwise exercisable at an earlier date, in
accordance with this Section 4, all of the Warrants shall be fully exercisable
commencing of the fifth anniversary of the Issue Date.

            (b) Early Exercise Rights. Subject to the provisions of Section 4(d)
      hereof, Warrant Holder shall have the following early exercise rights:

                  (i)   The Warrant Holder will have the right at any time
                        during the first Measuring Period (as defined in Section
                        4(c) below), to exercise Warrants, subject to adjustment
                        as provided in Section 10 hereof, equal to [**]% or
                        [**]% of the Shares, as applicable, provided that,
                        except as otherwise provided in Sections 4(b)(iii) and
                        4(b)(iv) hereof, (i) the right to exercise Warrants for
                        [**]% of the Shares shall not accrue unless and

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                        until the Company has, on an aggregated basis during the
                        first Measuring Period, received at least [**] million
                        of Net Revenues (as also defined in Section 4(c) below)
                        from tickets sold during such Measuring Period for
                        travel on the Warrant Holder, its subsidiaries and/or on
                        the Warrant Holder's code share partners using Warrant
                        Holder's code (collectively, "Warrant Holder and its
                        Code Share Partners"), and (ii) the right to exercise
                        Warrants for [**]% of the Shares shall not accrue unless
                        and until the Company has, on an aggregated basis during
                        the first Measuring Period, received at least $[**]
                        million of Net Revenues from tickets sold during such
                        Measuring Period for travel on the Warrant Holder and
                        its Code Share Partners.

                  (ii)  The Warrant Holder will have the right at any time
                        during the second Measuring Period and all remaining
                        Measuring Periods thereafter, to exercise Warrants,
                        subject to adjustment as provided in Section 10 hereof,
                        equal to [**]% or [**]% of the Shares, as applicable, or
                        such lesser percentage of the Shares as shall constitute
                        all of the remaining Shares not then exercisable;
                        provided that (i) the right to exercise Warrants for
                        [**]% of such Shares shall not accrue unless and until
                        the Company has, on an aggregated basis during the
                        applicable Measuring Period, received at least $[**]
                        million of Net Revenues from tickets sold during such
                        Measuring Period for travel on the Warrant Holder and
                        its Code Share Partners, and (ii) the right to exercise
                        Warrants for [**]% of such Shares shall not accrue
                        unless and until the Company has, on an aggregated basis
                        during the applicable Measuring Period, received at
                        least $[**] million of Net Revenues from tickets sold
                        during such Measuring Period for travel on the Warrant
                        Holder and its Code Share Partners.

                  (iii) Notwithstanding the Net Revenue benchmarks specified in
                        clauses (i) and (ii) of this Section 4(b) for the early
                        exercisability of Warrants, if, in any Measuring Period,
                        the Company fails to achieve the minimum Net Revenues
                        from ticket sales for travel on Warrant Holder and its
                        Code Share Partners necessary to enable Warrant Holder
                        to exercise Warrants for the [**]% or [**]% portion of
                        Shares that would otherwise become exercisable if such
                        benchmarks were achieved during such Measuring Period,
                        then, effective on the last day of such Measuring Period
                        and thereafter, Warrant Holder (i) shall have the right
                        to exercise Warrants for the [**]% portion of Warrants
                        that would otherwise become exercisable upon achieving
                        the corresponding Net Revenue benchmark for such
                        Measuring Period, if Warrant Holders and its Code Share
                        Partners' percentage of the aggregate of all ticket sale
                        revenues (calculated using the same methodology used to
                        calculate Net Revenue hereunder) received by the Company
                        for U.S. originating O&D's for such Measuring Period
                        equals or exceeds [**]% of Warrant Holder's Fair Share
                        (as defined in Section 4(c) below) (the "[**]% Fair
                        Share Threshold"), and (ii) shall have the right to
                        exercise Warrants for the [**]% portion of Warrants that
                        would otherwise become exercisable upon achieving the
                        corresponding Net Revenue benchmark for such Measuring
                        Period, if Warrant Holder's and its Code Share Partners'
                        percentage of the aggregate of all ticket sale revenues
                        received by the Company for U.S. originating O&D's for
                        such Measuring Period equals or exceeds [**]% of Warrant
                        Holder's Fair Share (the "[**]% Fair Share Threshold").

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                  (iv)  In the event that the Company does not achieve the
                        $[**] million Net Revenue benchmark specified in
                        clauses (i) of this Section 4(b) and Warrant Holder does
                        not achieve the [**]% Fair Share Threshold specified in
                        clause (iii) of this Section 4(b) for the early
                        exercisability of Warrants for the first Measuring
                        Period, Warrant Holder shall have the right upon
                        completion of the first Measuring Period and thereafter
                        to exercise Warrants for the [**]% portion of Warrants
                        that would otherwise become exercisable upon the
                        Company's achieving the $[**] million Net Revenue
                        benchmark or Warrant Holder's achieving the [**]% Fair
                        Share Threshold for such Measuring Period, if, during
                        the entire term of the first Measuring Period, Warrant
                        Holder does not voluntarily participate in any "demand
                        collection system" (as defined in Section 4 (d)) other
                        than the Company's and its affiliates' airline ticket
                        services.

            (c) Measuring Periods and Net Revenue.

                  (i)   As used in this Warrant Agreement, the term "Measuring
                        Period" shall mean a 12-month period, with the first
                        such Measuring Period commencing on the Date the Warrant
                        Holder first provides tickets for sale by the Company
                        following the Grant Date (the "First Ticket Date").
                        Subsequent Measuring Periods will expire on the second,
                        third, fourth and fifth anniversary of the First Ticket
                        Date, respectively, except that the fifth Measuring
                        Period shall end on the fifth (5Th) anniversary of the
                        Issue Date.

                  (ii)  As used in this Warrant Agreement, the term "Net
                        Revenue" shall mean the total ticket revenue received by
                        the Company from tickets sold for travel on the Warrant
                        Holder and its Code Share Partners, net of federal
                        excise and segment taxes, passenger facility charges and
                        related fees. The parties acknowledge that credit card
                        processing fees, and any processing fees or similar fees
                        charged by the Company to the consumer in connection
                        with the sale of a ticket shall not be included in the
                        calculation of Net Revenue..

                  (iii) As used in this Warrant Agreement, the term "Fair Share"
                        shall mean Warrant Holder's domestic market share
                        calculated as a fraction, the numerator of which shall
                        be Warrant Holder's RPM's for U.S. originating O&D's
                        only, and the denominator of which shall be the total
                        RPM's for U.S. originating O&D's only of all of the
                        Company's participating airlines.

            (d)   Warrant Holder's right to early exercise under Section 4(b) is
                  contingent upon Airline's participating exclusively in the
                  Company's leisure airline ticket service as the only "demand
                  collection system" for Warrant Holder's sale of airline
                  tickets over the Internet. For purposes of this Section 4(d),
                  "demand collection system" is narrowly defined as an airline
                  ticket service that (i) enables a consumer to name the price
                  the consumer willing to pay for one or more airline tickets
                  (ii) enables the seller to bind the consumer to the consumer's
                  offer price upon the seller's acceptance of the consumer's
                  offer, and (iii) does not permit the consumer to specify the
                  exact airline on which the consumer is willing to fly. In
                  order for Warrant Holder to be entitled to the early exercise
                  rights specified in Section 4(b), Warrant Holder must not at
                  any time between the date hereof and the date

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<PAGE>

                  exercises an early exercise of Warrants in accordance with
                  Section 4(b) participate in any "demand collection system"
                  other than the Company's for the sale of airline tickets over
                  the Internet. For example, if in the first Measuring Period,
                  the Company achieves Net Revenues to that would entitle the
                  Warrant Holder to exercise Warrants for [**]% of the Shares,
                  the Warrant Holder will be entitle to exercise such Warrants
                  at all time thereafter so long as the Warrant Holder at all
                  times from the date hereof though the date of such exercise
                  has not participated in another "demand collection system" for
                  the sale of airline tickets over the Internet. If at any time
                  from the date hereof though to the fifth 5th anniversary of
                  the Grant Date, the Warrant Holder participates in another
                  "demand collection system" for the sale of airline ticket over
                  the Internet, the Warrant Holder's early exercise rights will
                  terminate and be of no further force or effect, and such
                  Warrants will become exercisable on the fifth 5th anniversary
                  of the Grant Date.

      5. Exercise of Purchase Rights.

            (a) Subject to the provisions of Section 4 of this Warrant
Agreement, the purchase rights represented by this Warrant Agreement are
exercisable by the Warrant Holder, in whole or in part, at any time, or from
time to time during the period set forth in Section 3 above, by tendering to the
Company at its principal office a duly completed and executed notice of exercise
in the form attached hereto as Exhibit A (the "Notice of Exercise"), the
Warrants and the Exercise Price. Upon receipt of such items, the Company shall
issue to the Warrant Holder a certificate for the number of shares of Common
Stock purchased. The Warrant Holder, upon exercise of the Warrants, shall be
deemed to have become the holder of the Shares represented thereby (and such
Shares shall be deemed to have been issued) immediately prior to the close of
business on the date or dates upon which the Warrants are exercised. In the
event of any exercise of the rights represented by the Warrants, certificates
for the Shares so purchased shall be delivered to the Warrant Holder or its
designee as soon as practical and in any event within ten (10) business days
after receipt of such notice and, unless the Warrants have been fully exercised
or expired, new Warrants representing the remaining portion of the Warrants and
the underlying Shares, if any, with respect to which this Warrant Agreement
shall not then have been exercised shall also be issued to the Warrant Holder as
soon as possible and in any event within such ten-day period.

            (b) Net Issue Exercise. Notwithstanding any provisions herein to the
contrary, if the fair market value of one share of the Company's Common Stock is
greater than the Exercise Price (at the date of calculation as set forth below),
in lieu of exercising the Warrants for cash, the Warrant Holder may elect to
receive shares equal to the value (as determined below) of the Warrants (or
portion thereof being canceled) by surrender of the Warrants at the principal
office of the Company together with the duly executed Notice of Exercise in
which event the Company shall issue to the Warrant Holder a number of shares of
Common Stock computed using the following formula: X=Y(A-B)/ A WHERE X= the
number of shares of Common Stock to be issued to the Warrant Holder; Y= the
number of shares of the Common Stock purchasable under the Warrants or, if only
a portion of the Warrants is being exercised, the portion of the Warrants being
canceled (at the date of such calculation); A= the fair market value of one
share of the Company's Common Stock (at the date of such calculation); and B=
Exercise Price (at the date of such calculation). For purposes of the above
calculation, fair market value of one share of the Common Stock shall be equal
to the closing trading price of the Company's Common Stock on the day
immediately prior to the date the Notice of Exercise is tendered to the Company.

      6. Reservation of Shares. The Company will at all times have authorized
and reserved a sufficient number of shares of Common Stock to provide for the
exercise of the rights to purchase the Shares as provided in this Warrant
Agreement. All of the Shares shall be duly authorized and, when issued upon

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<PAGE>

such exercise, shall be validly issued, fully paid and nonassessable, and free
and clear of all preemptive rights.

      7. No Fractional Shares. No fractional shares or scrip representing
fractional shares shall be issued upon the exercise of the Warrant Holder's
rights to purchase the Shares.

      8. No Rights as Shareholder. This Warrant Agreement does not entitle the
Warrant Holder to any voting rights or other rights as a shareholder of the
Company prior to the exercise of the Warrant Holder's rights to purchase the
Shares as provided for herein.

      9. Redemption. The Warrants represented by this Warrant Agreement are not
redeemable by the Company.

      10. Adjustment Rights. The Exercise Price and the number of shares of
Common Stock purchasable hereunder are subject to adjustment from time to time,
as follows:

            (a) Merger. If at any time there shall be a merger or consolidation
of the Company with or into another corporation when the Company is not the
surviving corporation, then, as part of such merger or consolidation, lawful
provision shall be made so that the holder of the Warrants evidenced hereby
shall thereafter be entitled to receive upon exercise of rights herein granted,
during the period specified herein and upon payment of the aggregate Exercise
Price, the number of shares of stock or other securities or property of the
successor corporation resulting from such merger or consolidation, to which a
holder of the stock deliverable upon exercise of the rights granted in this
Warrant Agreement would have been entitled in such merger or consolidation if
such rights had been exercised immediately before such merger or consolidation.
In any such case, appropriate adjustment shall be made in the application of the
provisions of this Warrant Agreement with respect to the rights and interests of
the holder after the merger or consolidation. The Company will not effect any
such merger or consolidation unless, prior to the consummation thereof, the
successor corporation shall assume, by written instrument reasonably
satisfactory in form and substance to the Warrant Holder, the obligations of the
Company under the Warrants.

            (b) Reclassification, Etc. If the Company at any time shall, by
subdivision, combination or reclassification of securities or otherwise, change
any of the securities as to which purchase rights under this Warrant Agreement
exist into the same or a different number of securities of any other class or
classes, this Warrant Agreement shall thereafter represent the right to acquire
such number and kind of securities as would have been issuable as the result of
such change with respect to the securities which were subject to the purchase
rights under this Warrant Agreement immediately prior to such subdivision,
combination, reclassification or other change.

            (c) Split, Subdivision or Combination of Shares. If the Company at
any time shall split or subdivide its Common Stock, the Exercise Price shall be
proportionately decreased and the number of Shares issuable pursuant to this
Warrant Agreement shall be proportionately increased. If the Company at any time
shall combine or reverse split its Common Stock, the Exercise Price shall be
proportionately increased and the number of Shares issuable pursuant to this
Warrant Agreement shall be proportionately decreased.

            (d) Stock Dividends. If the Company at any time shall pay a dividend
payable in Common Stock, then the Exercise Price shall be adjusted, from and
after the date of determination of stockholders entitled to receive such
dividend, to that price determined by multiplying the Exercise Price in effect
immediately prior to such date of determination by a fraction (i) the numerator
of which shall be the total number of shares of Common Stock outstanding
immediately prior to such dividend and (ii) the denominator of which shall be
the total number of shares of Common Stock outstanding immediately after such
dividend. The Warrant Holder shall thereafter be entitled to purchase, at the
Exercise Price resulting from such adjustment, the number of shares of Common
Stock (calculated to the nearest whole share)

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obtained by multiplying (i) the Exercise Price in effect immediately prior to
such adjustment by (ii) the number of shares of Common Stock issuable upon the
exercise hereof immediately prior to such adjustment and dividing the product
thereof by the Exercise Price resulting from such adjustment.

            (e) Other Changes. If any change in the outstanding Common Stock of
the Company or any other event occurs as to which the other provisions of this
Section 10 are not strictly applicable or if strictly applicable, would not
fairly protect the purchase rights of the Warrant Holder in accordance with such
provisions, then the Board of Directors of the Company shall make an adjustment
in the number of and class of shares available under the Warrants, the Exercise
Price or the application of such provisions, so as to protect the purchase
rights of the Warrant Holder. The adjustment shall be such as will give the
Warrant Holder upon exercise for the same aggregate Exercise Price the total
number, class and kind of shares or other property as the Warrant Holder would
have owned had the Warrants been exercised prior to the event and had the
Warrant Holder continued to hold such shares until after the event requiring
adjustment.

            (f) Notice of Adjustments; Notices. Whenever the Exercise Price or
number of shares purchasable hereunder shall be adjusted pursuant to Section 10
hereof, the Company shall issue a certificate signed by its Chief Executive
Officer or Chief Financial Officer setting forth, in reasonable detail, the
event requiring the adjustment, the amount of the adjustment, the method by
which such adjustment was calculated and the Exercise Price and number of shares
purchasable hereunder after giving effect to such adjustment, and shall cause a
copy of such certificate to be mailed (by first class mail, postage prepaid) to
the holder of this Warrant. The Company shall give written notice to the Warrant
Holder at least 10 days prior to the date on which the Company closes its books
or takes a record for determining rights to receive any dividends or
distributions. The Company shall also give written notice to the Warrant Holder
at least 30 business days prior to the date on which a merger or consolidation
of the Company with or into another corporation when the Company is not the
surviving corporation shall take place.

            (g) No Change of Warrant Necessary. Irrespective of any adjustment
in the Exercise Price or in the number or kind of securities issuable upon
exercise of the Warrant, unless the Warrant Holder otherwise requests, this
Warrant Agreement may continue to express the same price and number and kind of
shares of Common Stock as are stated in this Warrant Agreement as initially
executed.

      11. Representations and Warranties of the Warrant Holder.

      The Warrant Holder hereby represents and warrants to the Company as
follows:

            (a) Existence and Power. The Warrant Holder is a (i) is a
corporation duly organized, validly existing and in good standing under the laws
of the jurisdiction of its incorporation and (ii) has the corporate power and
authority to execute, deliver and perform its obligations under this Warrant
Agreement.

            (b) Authorization; No Contravention. The execution, delivery and
performance by the Warrant Holder of this Warrant Agreement and the transactions
contemplated hereby (i) have been duly authorized by all necessary corporate
action of the Warrant Holder and (ii) do not contravene the terms of the
Certificate of Incorporation or By-laws of the Warrant Holder, each as amended
as of and through the Issue Date.

            (c) Governmental Authorization; Third Party Consents. No approval,
consent, compliance, exemption or authorization of any governmental authority or
agency, or of any other person or entity, is necessary or required in connection
with the execution, delivery or performance by, or enforcement against, the
Warrant Holder of this Warrant Agreement or the transactions contemplated
hereby.

            (d) Binding Effect. This Warrant Agreement has been duly executed
and delivered by the Warrant Holder and constitutes the valid and binding
obligations of the Warrant Holder, enforceable against it in accordance with its
terms, except as enforceability may be limited by applicable bankruptcy,

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<PAGE>

insolvency, reorganization, fraudulent conveyance or transfer, moratorium or
similar laws affecting the enforcement of creditors' rights generally or by
equitable principles relating to enforceability (regardless of whether
considered in a proceeding at law or in equity).

            (e) Purchase for Own Account. The Warrants issued to the Warrant
Holder pursuant to this Warrant Agreement, and the Shares to be issued upon
vesting and exercise thereof, are being or will be acquired for the Warrant
Holder's own account and with no intention of distributing or reselling such
securities or any part thereof in any transaction that would be in violation of
the securities laws of the United States of America, or any state.

            (f) Restricted Securities. The Warrant Holder understands that the
Warrants and the Shares issuable upon vesting and exercise of the Warrants, will
not be registered at the time of their issuance under the Securities Act for the
reason that the sale provided for in this Agreement is exempt pursuant to
Section 4(2) of the Securities Act and that reliance of the Company on such
exemption is predicated in part on such Warrant Holder's representations set
forth herein. The Warrant Holder represents that it is experienced in evaluating
companies such as the Company, has such knowledge and experience in financial
and business matters as to be capable of evaluating the merits and risks of its
investment and has the ability to suffer the total loss of the investment. The
Warrant Holder further represents that it has had the opportunity to ask
questions of and receive answers from the Company concerning the terms and
conditions of the Warrants, the business of the Company, and to obtain
additional information to such Warrant Holder's satisfaction.

            (g) Accredited Investor. The Warrant Holder is an "Accredited
Investor" within the meaning of Rule 501 of Regulation D under the Securities
Act, as presently in effect.

      12. Compliance with Securities Act; Transferability of Warrant or Shares
of Common Stock.

            (a) Compliance with Securities Act. The Warrant Holder, by
acceptance hereof, agrees that the Warrants, and the shares of Common Stock to
be issued upon exercise of the Warrants, are being acquired for investment and
that such Warrant Holder will not offer, sell or otherwise dispose of the
Warrants, or any shares of Common Stock to be issued upon exercise of the
Warrants except under circumstances which will not result in a violation of the
Securities Act of 1933, as amended (the "Securities Act"), or any applicable
state securities laws. The Warrants and all shares of Common Stock issued upon
exercise of the Warrants (unless registered under) the Securities Act and any
applicable state securities laws) shall be stamped or imprinted with a legend in
substantially the following form:

           "THESE SECURITIES HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT
           OF 1933, AS AMENDED, OR ANY STATE SECURITIES LAW. THEY MAY NOT BE
           SOLD OR OFFERED FOR SALE, PLEDGED, HYPOTHECATED OR OTHERWISE
           TRANSFERRED IN THE ABSENCE OF AN EFFECTIVE REGISTRATION STATEMENT
           RELATED THERETO UNDER SAID ACT AND APPLICABLE STATE SECURITIES LAWS
           OR UNLESS THE COMPANY HAS RECEIVED AN OPINION OF COUNSEL THAT SUCH
           REGISTRATION IS NOT REQUIRED TO EFFECTUATE SUCH TRANSACTION."

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<PAGE>

      (b) Exchange, Transfer, Assignment. The Warrants cannot be exchanged,
transferred or assigned otherwise than in accordance with applicable law. Upon
compliance with applicable law and surrender of the Warrants to the Company with
the Assignment Form annexed hereto as Exhibit B duly executed, and funds
sufficient to pay any transfer tax, the Company shall, without charge, execute
and deliver a new Warrant Agreement in the name of the heir, devisee or assignee
named in such instrument of assignment and this Warrant Agreement shall promptly
be canceled. Subject to the terms hereof, the Warrants may be assigned in whole
or in part.

      13. Restricted Securities. The Warrant Holder understands that the
Warrants and the Shares issuable upon vesting and exercise of the Warrants, will
not be registered at the time of their issuance under the Securities Act for the
reason that the sale provided for in this Agreement is exempt pursuant to
Section 4(2) of the Securities Act based on the representations of the warrant
Holder set forth herein. The Warrant Holder represents that it is experienced in
evaluating companies such as the Company, has such knowledge and experience in
financial and business matters as to be capable of evaluating the merits and
risks of its investment and has the ability to suffer the total loss of the
investment. The Warrant Holder further represents that it has had the
opportunity to ask questions of and receive answers from the Company concerning
the terms and conditions of the Warrants, the business of the Company, and to
obtain additional information to such Warrant Holder's satisfaction. The Warrant
Holder is an "Accredited Investor" within the meaning of Rule 501 of Regulation
D under the Securities Act, as presently in effect.

      14. Registration Rights. Upon the parties' execution of this Warrant
Agreement and the Acknowledgment and Agreement to the Amended and Restated
Registration Rights Agreement attached hereto as Exhibit C, Warrant Holder shall
be made a party to that certain Amended and Restated Registration Rights
Agreement, dated as of December 8, 1998, by and among the Company, the
stockholders of the Company named therein and such other stockholders and
warrant holders of the Company made a party thereto. In addition, within 30 days
of the execution of this Warrant Agreement, the Company agrees to enter into an
agreement with Warrant Holder, in form and substance reasonably satisfactory to
Warrant Holder, which shall grant Warrant Holder the right to transfer its
registration rights pursuant to such Amended and Restated Registration Rights
Agreement dated as of December 8, 1998 to any assignee or assignees of all or
any part of this Warrant or the Shares issuable upon exercise hereof, which
assignees, upon their execution and delivery of an Acknowledgment and Agreement
to the Amended and Restated Registration Rights Agreement substantially in the
form of Exhibit C hereto (with appropriate changes therein) shall each have all
the rights and obligations of a Demand Stockholder (as defined in such
Agreement) under such Agreement; provided that no registration statement with
respect to less than a minimum of 250,000 Shares shall be required to be
effected by the Company thereunder for the benefit of any such assignee.

      15. Miscellaneous.

            (a) No Consequential Damages. No party hereto shall be entitled to
consequential damages as a result of any breach of a covenant, representation or
warranty contained herein.

            (b) Notices. All notices, demands and other communications provided
for or permitted hereunder shall be made in writing and shall be by registered
or certified first-class mail, return receipt requested, telecopier, courier
service or personal delivery:

                  (i)   if to the Company, to:

                        priceline.com Incorporated
                        Five High Ridge Park
                        Stamford, CT 06905
                        Telecopy:  (203) 595-8345
                        Attention:  Melissa M. Taub, Esq.

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<PAGE>

                  and to:

                        Skadden, Arps, Slate, Meagher, & Flom, L.L.P.
                        One Rodney Square
                        Wilmington, DE  19801
                        Telecopy:  (302) 651-3001
                        Attention:  Patricia Moran Chuff, Esq.

                  (ii)  if to the Warrant Holder, to:

                        Trans World Airlines, Inc.
                        One City Centre
                        515 North 6th
                        Saint Louis, Missouri  63101
                        Attention:  Corporate Secretary
                        Telephone:
                        Fax:  314-589-3267

                  and to:

                        Trans World Airlines, Inc.
                        Level 5
                        11500 Ambassador Drive
                        Kansas City, Missouri  64153
                        Telephone:
                        Telecopy:  816-464-6168
                        Attention:  Treasurer

            All such notices and communications shall be deemed to have been
duly given when delivered by hand, if personally delivered; when delivered by
courier, if delivered by commercial courier service; five (5) business days
after being deposited in the mail, postage prepaid, if mailed; and when receipt
is mechanically acknowledged, if telecopied.

            (d) Successors and Assigns; Third Party Beneficiaries. This
Agreement shall inure to the benefit of and be binding upon the successors and
permitted assigns of the parties hereto. No person, other than the parties
hereto and their successors and permitted assigns, is intended to be a
beneficiary of this Agreement.

            (e) Amendment and Waiver.

                  (i) No failure or delay on the part of the Company, or the
Warrant Holder in exercising any right, power or remedy hereunder shall operate
as a waiver thereof, nor shall any single or partial exercise of any such right,
power or remedy preclude any other or further exercise thereof or the exercise
of any other right, power or remedy. The remedies provided for herein are
cumulative and are not exclusive of any remedies that may be available to the
Company and the Warrant Holder at law, in equity or otherwise.

                  (ii) Any amendment, supplement or modification of or to any
provision of this Warrant Agreement, any waiver of any provision of this Warrant
Agreement, and any consent to any

                                      -9-
<PAGE>

departure by the Company or the Warrant Holder from the terms of any provision
of this Agreement, shall be effective only if it is made or given in writing and
signed by the Company and the Warrant Holder.

            (f) Counterparts. This Warrant Agreement may be executed in any
number of counterparts and by the parties hereto in separate counterparts, each
of which when so executed shall be deemed to be an original and all of which
taken together shall constitute one and the same agreement.

            (g) Headings. The headings in this Warrant Agreement are for
convenience of reference only and shall not limit or otherwise affect the
meaning hereof.

            (h) GOVERNING LAW. THIS WARRANT AGREEMENT SHALL BE GOVERNED BY AND
CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF DELAWARE, WITHOUT REGARD
TO THE PRINCIPLES OF CONFLICTS OF LAW OF ANY JURISDICTION.

            (i) Severability. If any one or more of the provisions contained
herein, or the application thereof in any circumstance, is held invalid, illegal
or unenforceable in any respect for any reason, the validity, legality and
enforceability of any such provision in every other respect and of the remaining
provisions hereof shall not be in any way impaired, unless the provisions held
invalid, illegal or unenforceable shall substantially impair the benefits of the
remaining provisions hereof.

            (j) Entire Agreement. This Warrant Agreement, together with the
exhibits hereto is intended by the parties as a final expression of their
agreement and intended to be a complete and exclusive statement of the agreement
and understanding of the parties hereto in respect of the subject matter
contained herein. This Warrant Agreement, together with the exhibits hereto,
supersedes all prior agreements and understandings between the parties with
respect to such subject matter.

            (k) Publicity. Except as may be required by law, none of the parties
hereto shall issue a publicity release or public announcement or otherwise make
any disclosure concerning this Warrant Agreement or the transactions
contemplated hereby, without prior approval by the other party (which approval
shall not be unreasonably withheld); provided, however, that nothing in this
Warrant Agreement shall restrict the Warrant Holder from disclosing information
(a) that is already publicly available and (b) to its attorneys, accountants,
consultants and other advisors to the extent necessary to obtain their services
in connection with the Warrant Holder's investment or participation in the
Company. If any announcement is required by law to be made by any party hereto
concerning this Warrant Agreement or the transactions contemplated hereby, prior
to making such announcement such party will deliver a draft of such announcement
to the other parties and shall give the other parties an opportunity to comment
thereon.

            (l) Charges; Taxes and Expenses. Issuance of certificates for shares
upon the exercise of the Warrants shall be made without charge to the Warrant
Holder for any issue or transfer tax or other incidental expense in respect of
the issuance of such certificates, all of which taxes and expenses shall be paid
by the Company.

            (m) Saturdays, Sundays, Holidays, Etc. If the last or appointed day
for the taking of any action or the expiration of any right required or granted
herein shall be a Saturday, Sunday or a legal holiday, then such action may be
taken or such right may be exercised on the next succeeding day not a Saturday,
Sunday or a legal holiday.

            (n) Lost Warrants. The Company covenants to the Warrant Holder that,
upon receipt of evidence reasonably satisfactory to the Company of the loss,
theft, destruction or mutilation of this Warrant Agreement and, in the case of
any such loss, theft or destruction, upon receipt of an indemnity reasonably
satisfactory to the Company, or in the case of any such mutilation, upon
surrender and

                                      -10-
<PAGE>

cancellation of this Warrant Agreement, the Company will make and deliver a new
Warrant Agreement of like tenor, in lieu of the lost, stolen, destroyed or
mutilated document.

            (o) Further Assurances. Each of the parties shall execute such
documents and perform such further acts (including, without limitation,
obtaining any consents, exemptions, authorizations or other actions by, or
giving any notices to, or making any filings with, any governmental authority or
any other person, and otherwise fulfilling, or causing the fulfillment of, the
various obligations made herein), as may be reasonably required or desirable to
carry out or to perform the provisions of this Warrant Agreement and to
consummate and make effective as promptly as possible the transactions
contemplated by this Warrant Agreement.

                                      -11-
<PAGE>

IN WITNESS WHEREOF, this Warrant Agreement has been duly executed and delivered
by the authorized officers of each of the undersigned.

                                    PRICELINE.COM INCORPORATED

                                    By:__________________________________
                                        Name:
                                        Title:

                                    TRANS WORLD AIRLINES, INC.

                                    By:__________________________________
                                        Name:
                                        Title:

                                      -12-
<PAGE>

EXHIBIT A

NOTICE OF EXERCISE

To:   priceline.com Incorporated

            1. ___ The undersigned hereby elects to purchase __________ shares
of the Common Stock of priceline.com Incorporated pursuant to the terms of the
Participation Warrant Agreement, dated as of _________________, 1999, by and
between priceline.com Incorporated and the undersigned (the "Warrant
Agreement"), and tenders herewith payment of the purchase price of such shares
in full.

            ___ The undersigned hereby elects to convert ___________ percent
(____%) of the value of the Warrants pursuant to the provisions of Section 5(b)
of the Warrant Agreement.

            2. Please issue a certificate or certificates representing said
shares in the name of the undersigned.

                                    TRANS WORLD AIRLINES, INC.

                                    By:________________________________

                                     ___________________________________
                                    (Print Name of Signatory)

                                     ___________________________________
                                    (Title of Signatory)

Date:_____________________

                                      -13-
<PAGE>

EXHIBIT B

ASSIGNMENT FORM

TO: priceline.com Incorporated

The undersigned hereby assigns and transfers unto _____________________________
of _________________________________________________________________
               (Please typewrite or print in block letters)
the right to purchase ____________ shares of the common stock of priceline.com
Incorporated subject to the Participation Warrant Agreement, dated as of
________________, 1999, by and between priceline.com Incorporated and the
undersigned (the "Warrant Agreement").

This assignment complies with the provisions of Section 12(b) of the Warrant
Agreement and is accompanied by funds sufficient to pay all applicable transfer
taxes.

                                     TRANS WORLD AIRLINES, INC.

                                     By:________________________________

                                     ___________________________________
                                     (Print Name of Signatory)

                                     ___________________________________
                                     (Title of Signatory)

Date:_____________________
<PAGE>

Exhibit C

ACKNOWLEDGMENT AND AGREEMENT
TO THE AMENDED AND RESTATED REGISTRATION RIGHTS AGREEMENT

      WHEREAS, pursuant to a Participation Warrant Agreement, the undersigned
received a warrant to purchase 500,000 shares of common stock, par value $.008
per share (the "Shares"), of priceline.com Incorporated, a Delaware corporation
(the "Company"); and

WHEREAS, the undersigned wishes to receive certain registration rights with
respect to such Shares; and

      WHEREAS, the undersigned has reviewed a copy of that certain Amended and
Restated Registration Rights Agreement, dated as of December 8, 1998 (the
"Agreement"), among the Company, General Atlantic Partners 48, L.P., GAP
Coinvestment Partners, L.P., General Atlantic Partners 50, L.P. and the
stockholders named therein and has been given a copy of the Agreement and
afforded ample opportunity to read and to have counsel review it, and the
undersigned is thoroughly familiar with its terms.

      NOW, THEREFORE, in consideration of the mutual premises contained herein
and in the Agreement and for other good and valuable consideration, the receipt
and sufficiency of which is hereby acknowledged, the undersigned hereby
acknowledges and agrees that (i) the undersigned has been given a copy of the
Agreement and afforded ample opportunity to read and to have counsel review it,
and the undersigned is thoroughly familiar with its terms, (ii) the Shares are
subject to terms and conditions set forth in the Agreement, (iii) the
undersigned does hereby agree fully to be bound by the Agreement as a "Demand
Stockholder" (as therein defined), and upon the execution and delivery of this
Acknowledgment and Agreement by the Company, the undersigned shall have all the
rights and obligations under the Agreement as a Demand Stockholder, and (iv) the
undersigned does hereby name _________________to serve as their representative
under the Agreement.

      This 17th day of November, 1999.

Acknowledged and agreed:

PRICELINE.COM INCORPORATED                  TRANS WORLD AIRLINES, INC.

By:_____________________________            By:_________________________
   Name:                                       Name:
   Title:                                      Title:

                                      -2-

[**] = Confidential Treatment requested for redacted portionExhibit 10.27

             CONFIDENTIAL TREATMENT HAS BEEN REQUESTED FOR CERTAIN
           PORTIONS OF THIS DOCUMENT. CONFIDENTIAL PORTIONS HAVE BEEN
               FILED WITH THE SECURITIES AND EXCHANGE COMMISSION.

THE WARRANT ISSUED PURSUANT TO THIS PARTICIPATION WARRANT AGREEMENT HAS NOT BEEN
REGISTERED UNDER THE SECURITIES ACT OF 1933 OR ANY STATE SECURITIES LAWS. IT MAY
NOT BE SOLD OR OFFERED FOR SALE, PLEDGED, HYPOTHECATED OR OTHERWISE TRANSFERRED
IN THE ABSENCE OF AN EFFECTIVE REGISTRATION STATEMENT UNDER SAID ACT AND
APPLICABLE STATE SECURITIES LAWS UNLESS THE COMPANY HAS RECEIVED AN OPINION OF
COUNSEL REASONABLY SATISFACTORY TO THE COMPANY THAT SUCH REGISTRATION IS NOT
REQUIRED TO EFFECTUATE SUCH TRANSACTION.

                         PARTICIPATION WARRANT AGREEMENT
                       To Purchase Shares of Common Stock
                          Dated as of November 17, 1999
                           PRICELINE.COM INCORPORATED
                             a Delaware Corporation

                                                   Issue Date: November 17, 1999

THIS CERTIFIES THAT, Northwest Airlines, Inc. (the "Warrant Holder"), with a
place of business at 5101 Northwest Drive, Saint Paul, Minnesota 55111-3034, for
value received, is entitled, upon the terms and subject to the conditions of
this Participation Warrant Agreement (this "Warrant Agreement"), to subscribe
for and purchase fully-paid and non-assessable shares of common stock, par value
$.008 per share (the "Common Stock"), of priceline.com Incorporated, a Delaware
corporation (the "Company").

      1. Issuance of Warrants. On the Issue Date, the Company will issue to the
Warrant Holder warrants (the "Warrants") to acquire Five Hundred Thousand
(500,000) shares of the Common Stock (the "Shares"), subject to adjustment as
hereinafter provided pursuant to Section 10 herein.

      2. Exercise Price. The Warrants have an exercise price of $59.93 per share
of Common Stock, as adjusted pursuant to the provisions of Section 10 of this
Warrant Agreement (the "Exercise Price").

      3. Term. The Warrants are fully vested on the Issue Date. Except as
otherwise provided herein, the term of the Warrants and the right to purchase
Shares as granted herein shall be exercisable on the fifth (5th) anniversary of
the Issue Date; provided, further, that if any of the Warrants first become
exercisable on the fifth (5th) anniversary of the Issue Date, the Warrant Holder
will have an additional six months thereafter to exercise its purchase rights in
respect of those Warrants (the end of such five year period and additional six
months, if applicable, being referred to herein as the "Termination Date").

      4. Exercise Events.

            (a) General. Unless otherwise exercisable at an earlier date, in
accordance with this Section 4, all of the Warrants shall be fully exercisable
commencing of the fifth anniversary of the Issue Date.

            (b) Early Exercise Rights. Subject to the provisions of Section 4(d)
hereof, Warrant Holder shall have the following early exercise rights:

                  (i)   The Warrant Holder will have the right at any time
                        during the first Measuring Period (as defined in Section
                        4(c) below), to exercise Warrants, subject to adjustment
                        as provided in Section 10 hereof, equal to [**]% or
                        [**]% of the Shares, as applicable, provided that,
                        except as otherwise provided in Sections 4(b)(iii) and
                        4(b)(iv) hereof, (i) the right to exercise Warrants for
                        [**]% of the Shares shall not accrue unless and

                                      -1-
<PAGE>

                        until the Company has, on an aggregated basis during the
                        first Measuring Period, received at least $[**] million
                        of Net Revenues (as also defined in Section 4(c) below)
                        from tickets sold during such Measuring Period for
                        travel on the Warrant Holder, its subsidiaries and/or on
                        the Warrant Holder's code share partners using Warrant
                        Holder's code (collectively, "Warrant Holder and its
                        Code Share Partners"), and (ii) the right to exercise
                        Warrants for [**]% of the Shares shall not accrue unless
                        and until the Company has, on an aggregated basis during
                        the first Measuring Period, received at least $[**]
                        million of Net Revenues from tickets sold during such
                        Measuring Period for travel on the Warrant Holder and
                        its Code Share Partners.

                  (ii)  The Warrant Holder will have the right at any time
                        during the second Measuring Period and all remaining
                        Measuring Periods thereafter, to exercise Warrants,
                        subject to adjustment as provided in Section 10 hereof,
                        equal to [**]% or [**]% of the Shares, as applicable, or
                        such lesser percentage of the Shares as shall constitute
                        all of the remaining Shares not then exercisable;
                        provided that (i) the right to exercise Warrants for
                        [**]% of such Shares shall not accrue unless and until
                        the Company has, on an aggregated basis during the
                        applicable Measuring Period, received at least $[**]
                        million of Net Revenues from tickets sold during such
                        Measuring Period for travel on the Warrant Holder and
                        its Code Share Partners, and (ii) the right to exercise
                        Warrants for [**]% of such Shares shall not accrue
                        unless and until the Company has, on an aggregated basis
                        during the applicable Measuring Period, received at
                        least $[**] million of Net Revenues from tickets sold
                        during such Measuring Period for travel on the Warrant
                        Holder and its Code Share Partners.

                  (iii) Notwithstanding the Net Revenue benchmarks specified in
                        clauses (i) and (ii) of this Section 4(b) for the early
                        exercisability of Warrants, if, in any Measuring Period,
                        the Company fails to achieve the minimum Net Revenues
                        from ticket sales for travel on Warrant Holder and its
                        Code Share Partners necessary to enable Warrant Holder
                        to exercise Warrants for the [**]% or [**]% portion of
                        Shares that would otherwise become exercisable if such
                        benchmarks were achieved during such Measuring Period,
                        then, effective on the last day of such Measuring Period
                        and thereafter, Warrant Holder (i) shall have the right
                        to exercise Warrants for the [**]% portion of Warrants
                        that would otherwise become exercisable upon achieving
                        the corresponding Net Revenue benchmark for such
                        Measuring Period, if Warrant Holders and its Code Share
                        Partners' percentage of the aggregate of all ticket sale
                        revenues (calculated using the same methodology used to
                        calculate Net Revenue hereunder) received by the Company
                        for U.S. originating O&D's for such Measuring Period
                        equals or exceeds [**]% of Warrant Holder's Fair Share
                        (as defined in Section 4(c) below) (the "[**]% Fair
                        Share Threshold"), and (ii) shall have the right to
                        exercise Warrants for the [**]% portion of Warrants that
                        would otherwise become exercisable upon achieving the
                        corresponding Net Revenue benchmark for such Measuring
                        Period, if Warrant Holder's and its Code Share Partners'
                        percentage of the aggregate of all ticket sale revenues
                        received by the Company for U.S. originating O&D's for
                        such Measuring Period equals or exceeds [**]% of Warrant
                        Holder's Fair Share (the "[**]% Fair Share Threshold").

                                      -2-
<PAGE>

                  (iv)  In the event that the Company does not achieve the
                        $[**] million Net Revenue benchmark specified in
                        clauses (i) of this Section 4(b) and Warrant Holder does
                        not achieve the [**]% Fair Share Threshold specified in
                        clause (iii) of this Section 4(b) for the early
                        exercisability of Warrants for the first Measuring
                        Period, Warrant Holder shall have the right upon
                        completion of the first Measuring Period and thereafter
                        to exercise Warrants for the [**]% portion of Warrants
                        that would otherwise become exercisable upon the
                        Company's achieving the $[**] million Net Revenue
                        benchmark or Warrant Holder's achieving the [**]% Fair
                        Share Threshold for such Measuring Period, if, during
                        the entire term of the first Measuring Period, Warrant
                        Holder does not voluntarily participate in any "demand
                        collection system" (as defined in Section 4(d)) other
                        than the Company's airline ticket service.

            (c) Measuring Periods and Net Revenue.

                  (i)   As used in this Warrant Agreement, the term "Measuring
                        Period" shall mean a 12-month period, with the first
                        such Measuring Period commencing on the Date the Warrant
                        Holder first provides tickets for sale by the Company
                        following the Grant Date (the "First Ticket Date").
                        Subsequent Measuring Periods will expire on the second,
                        third, fourth and fifth anniversary of the First Ticket
                        Date, respectively, except that the fifth Measuring
                        Period shall end on the fifth (5Th) anniversary of the
                        Issue Date.

                  (ii)  As used in this Warrant Agreement, the term "Net
                        Revenue" shall mean the total ticket revenue received by
                        the Company from tickets sold for travel on the Warrant
                        Holder and its Code Share Partners, net of federal
                        excise and segment taxes, passenger facility charges and
                        related fees. The parties acknowledge that credit card
                        processing fees, and any processing fees or similar fees
                        charged by the Company to the consumer in connection
                        with the sale of a ticket shall not be included in the
                        calculation of Net Revenue..

                  (iii) As used in this Warrant Agreement, the term "Fair Share"
                        shall mean Warrant Holder's domestic market share
                        calculated as a fraction, the numerator of which shall
                        be Warrant Holder's RPM's for U.S. originating O&D's
                        only, and the denominator of which shall be the total
                        RPM's for U.S. originating O&D's only of all of the
                        Company's participating airlines.

            (d)   Warrant Holder's right to early exercise under Section 4(b) is
                  contingent upon Airline's participating exclusively in the
                  Company's leisure airline ticket service as the only "demand
                  collection system" for Warrant Holder's sale of airline
                  tickets over the Internet. For purposes of this Section 4(d),
                  "demand collection system" is narrowly defined as an airline
                  ticket service that (i) enables a consumer to name the price
                  the consumer is willing to pay for one or more airline
                  tickets, (ii) enables the seller to bind the consumer to the
                  consumer's offer price upon the seller's acceptance of the
                  consumer's offer, and (iii) does not permit the consumer to
                  specify the exact airline on which the consumer is willing to
                  fly. In order for Warrant Holder to be entitled to the early
                  exercise rights specified in Section 4(b), Warrant Holder must
                  not at any time between the date hereof and the date

                                      -3-
<PAGE>

                  exercises an early exercise of Warrants in accordance with
                  Section 4(b) participate in any "demand collection system"
                  other than the Company's for the sale of airline tickets over
                  the Internet. For example, if in the first Measuring Period,
                  the Company achieves Net Revenues to that would entitle the
                  Warrant Holder to exercise Warrants for [**]% of the Shares,
                  the Warrant Holder will be entitle to exercise such Warrants
                  at all time thereafter so long as the Warrant Holder at all
                  times from the date hereof though the date of such exercise
                  has not participated in another "demand collection system" for
                  the sale of airline tickets over the Internet. If at any time
                  from the date hereof though to the fifth 5th anniversary of
                  the Grant Date, the Warrant Holder participates in another
                  "demand collection system" for the sale of airline ticket over
                  the Internet, the Warrant Holder's early exercise rights will
                  terminate and be of no further force or effect, and such
                  Warrants will become exercisable on the fifth 5th anniversary
                  of the Grant Date.

      5. Exercise of Purchase Rights.

            (a) Subject to the provisions of Section 4 of this Warrant
Agreement, the purchase rights represented by this Warrant Agreement are
exercisable by the Warrant Holder, in whole or in part, at any time, or from
time to time during the period set forth in Section 3 above, by tendering to the
Company at its principal office a duly completed and executed notice of exercise
in the form attached hereto as Exhibit A (the "Notice of Exercise"), the
Warrants and the Exercise Price. Upon receipt of such items, the Company shall
issue to the Warrant Holder a certificate for the number of shares of Common
Stock purchased. The Warrant Holder, upon exercise of the Warrants, shall be
deemed to have become the holder of the Shares represented thereby (and such
Shares shall be deemed to have been issued) immediately prior to the close of
business on the date or dates upon which the Warrants are exercised. In the
event of any exercise of the rights represented by the Warrants, certificates
for the Shares so purchased shall be delivered to the Warrant Holder or its
designee as soon as practical and in any event within ten (10) business days
after receipt of such notice and, unless the Warrants have been fully exercised
or expired, new Warrants representing the remaining portion of the Warrants and
the underlying Shares, if any, with respect to which this Warrant Agreement
shall not then have been exercised shall also be issued to the Warrant Holder as
soon as possible and in any event within such ten-day period.

            (b) Net Issue Exercise. Notwithstanding any provisions herein to the
contrary, if the fair market value of one share of the Company's Common Stock is
greater than the Exercise Price (at the date of calculation as set forth below),
in lieu of exercising the Warrants for cash, the Warrant Holder may elect to
receive shares equal to the value (as determined below) of the Warrants (or
portion thereof being canceled) by surrender of the Warrants at the principal
office of the Company together with the duly executed Notice of Exercise in
which event the Company shall issue to the Warrant Holder a number of shares of
Common Stock computed using the following formula: X=Y(A-B)/ A WHERE X= the
number of shares of Common Stock to be issued to the Warrant Holder; Y= the
number of shares of the Common Stock purchasable under the Warrants or, if only
a portion of the Warrants is being exercised, the portion of the Warrants being
canceled (at the date of such calculation); A= the fair market value of one
share of the Company's Common Stock (at the date of such calculation); and B=
Exercise Price (at the date of such calculation). For purposes of the above
calculation, fair market value of one share of the Common Stock shall be equal
to the closing trading price of the Company's Common Stock on the day
immediately prior to the date the Notice of Exercise is tendered to the Company.

      6. Reservation of Shares. The Company will at all times have authorized
and reserved a sufficient number of shares of Common Stock to provide for the
exercise of the rights to purchase the Shares as provided in this Warrant
Agreement. All of the Shares shall be duly authorized and, when issued upon such
exercise, shall be validly issued, fully paid and nonassessable, and free and
clear of all preemptive rights.

                                      -4-
<PAGE>

      7. No Fractional Shares. No fractional shares or scrip representing
fractional shares shall be issued upon the exercise of the Warrant Holder's
rights to purchase the Shares.

      8. No Rights as Shareholder. This Warrant Agreement does not entitle the
Warrant Holder to any voting rights or other rights as a shareholder of the
Company prior to the exercise of the Warrant Holder's rights to purchase the
Shares as provided for herein.

      9. Redemption. The Warrants represented by this Warrant Agreement are not
redeemable by the Company.

      10. Adjustment Rights. The Exercise Price and the number of shares of
Common Stock purchasable hereunder are subject to adjustment from time to time,
as follows:

            (a) Merger. If at any time there shall be a merger or consolidation
of the Company with or into another corporation when the Company is not the
surviving corporation, then, as part of such merger or consolidation, lawful
provision shall be made so that the holder of the Warrants evidenced hereby
shall thereafter be entitled to receive upon exercise of rights herein granted,
during the period specified herein and upon payment of the aggregate Exercise
Price, the number of shares of stock or other securities or property of the
successor corporation resulting from such merger or consolidation, to which a
holder of the stock deliverable upon exercise of the rights granted in this
Warrant Agreement would have been entitled in such merger or consolidation if
such rights had been exercised immediately before such merger or consolidation.
In any such case, appropriate adjustment shall be made in the application of the
provisions of this Warrant Agreement with respect to the rights and interests of
the holder after the merger or consolidation. The Company will not effect any
such merger or consolidation unless, prior to the consummation thereof, the
successor corporation shall assume, by written instrument reasonably
satisfactory in form and substance to the Warrant Holder, the obligations of the
Company under the Warrants.

            (b) Reclassification, Etc. If the Company at any time shall, by
subdivision, combination or reclassification of securities or otherwise, change
any of the securities as to which purchase rights under this Warrant Agreement
exist into the same or a different number of securities of any other class or
classes, this Warrant Agreement shall thereafter represent the right to acquire
such number and kind of securities as would have been issuable as the result of
such change with respect to the securities which were subject to the purchase
rights under this Warrant Agreement immediately prior to such subdivision,
combination, reclassification or other change.

            (c) Split, Subdivision or Combination of Shares. If the Company at
any time shall split or subdivide its Common Stock, the Exercise Price shall be
proportionately decreased and the number of Shares issuable pursuant to this
Warrant Agreement shall be proportionately increased. If the Company at any time
shall combine or reverse split its Common Stock, the Exercise Price shall be
proportionately increased and the number of Shares issuable pursuant to this
Warrant Agreement shall be proportionately decreased.

            (d) Stock Dividends. If the Company at any time shall pay a dividend
payable in Common Stock, then the Exercise Price shall be adjusted, from and
after the date of determination of stockholders entitled to receive such
dividend, to that price determined by multiplying the Exercise Price in effect
immediately prior to such date of determination by a fraction (i) the numerator
of which shall be the total number of shares of Common Stock outstanding
immediately prior to such dividend and (ii) the denominator of which shall be
the total number of shares of Common Stock outstanding immediately after such
dividend. The Warrant Holder shall thereafter be entitled to purchase, at the
Exercise Price resulting from such adjustment, the number of shares of Common
Stock (calculated to the nearest whole share) obtained by multiplying (i) the
Exercise Price in effect immediately prior to such adjustment by (ii) the

                                      -5-
<PAGE>

number of shares of Common Stock issuable upon the exercise hereof immediately
prior to such adjustment and dividing the product thereof by the Exercise Price
resulting from such adjustment.

            (e) Other Changes. If any change in the outstanding Common Stock of
the Company or any other event occurs as to which the other provisions of this
Section 10 are not strictly applicable or if strictly applicable, would not
fairly protect the purchase rights of the Warrant Holder in accordance with such
provisions, then the Board of Directors of the Company shall make an adjustment
in the number of and class of shares available under the Warrants, the Exercise
Price or the application of such provisions, so as to protect the purchase
rights of the Warrant Holder. The adjustment shall be such as will give the
Warrant Holder upon exercise for the same aggregate Exercise Price the total
number, class and kind of shares or other property as the Warrant Holder would
have owned had the Warrants been exercised prior to the event and had the
Warrant Holder continued to hold such shares until after the event requiring
adjustment.

            (f) Notice of Adjustments; Notices. Whenever the Exercise Price or
number of shares purchasable hereunder shall be adjusted pursuant to Section 10
hereof, the Company shall issue a certificate signed by its Chief Executive
Officer or Chief Financial Officer setting forth, in reasonable detail, the
event requiring the adjustment, the amount of the adjustment, the method by
which such adjustment was calculated and the Exercise Price and number of shares
purchasable hereunder after giving effect to such adjustment, and shall cause a
copy of such certificate to be mailed (by first class mail, postage prepaid) to
the holder of this Warrant. The Company shall give written notice to the Warrant
Holder at least 10 days prior to the date on which the Company closes its books
or takes a record for determining rights to receive any dividends or
distributions. The Company shall also give written notice to the Warrant Holder
at least 30 business days prior to the date on which a merger or consolidation
of the Company with or into another corporation when the Company is not the
surviving corporation shall take place.

            (g) No Change of Warrant Necessary. Irrespective of any adjustment
in the Exercise Price or in the number or kind of securities issuable upon
exercise of the Warrant, unless the Warrant Holder otherwise requests, this
Warrant Agreement may continue to express the same price and number and kind of
shares of Common Stock as are stated in this Warrant Agreement as initially
executed.

      11. Representations and Warranties of the Warrant Holder.

      The Warrant Holder hereby represents and warrants to the Company as
follows:

            (a) Existence and Power. The Warrant Holder is a (i) is a
corporation duly organized, validly existing and in good standing under the laws
of the jurisdiction of its incorporation and (ii) has the corporate power and
authority to execute, deliver and perform its obligations under this Warrant
Agreement.

            (b) Authorization; No Contravention. The execution, delivery and
performance by the Warrant Holder of this Warrant Agreement and the transactions
contemplated hereby (i) have been duly authorized by all necessary corporate
action of the Warrant Holder and (ii) do not contravene the terms of the
Certificate of Incorporation or By-laws of the Warrant Holder, each as amended
as of and through the Issue Date.

            (c) Governmental Authorization; Third Party Consents. No approval,
consent, compliance, exemption or authorization of any governmental authority or
agency, or of any other person or entity, is necessary or required in connection
with the execution, delivery or performance by, or enforcement against, the
Warrant Holder of this Warrant Agreement or the transactions contemplated
hereby.

            (d) Binding Effect. This Warrant Agreement has been duly executed
and delivered by the Warrant Holder and constitutes the valid and binding
obligations of the Warrant Holder, enforceable against it in accordance with its
terms, except as enforceability may be limited by applicable bankruptcy,
insolvency, reorganization, fraudulent conveyance or transfer, moratorium or
similar laws affecting the

                                      -6-
<PAGE>

enforcement of creditors' rights generally or by equitable principles relating
to enforceability (regardless of whether considered in a proceeding at law or in
equity).

            (e) Purchase for Own Account. The Warrants issued to the Warrant
Holder pursuant to this Warrant Agreement, and the Shares to be issued upon
vesting and exercise thereof, are being or will be acquired for the Warrant
Holder's own account and with no intention of distributing or reselling such
securities or any part thereof in any transaction that would be in violation of
the securities laws of the United States of America, or any state.

            (f) Restricted Securities. The Warrant Holder understands that the
Warrants and the Shares issuable upon vesting and exercise of the Warrants, will
not be registered at the time of their issuance under the Securities Act for the
reason that the sale provided for in this Agreement is exempt pursuant to
Section 4(2) of the Securities Act and that reliance of the Company on such
exemption is predicated in part on such Warrant Holder's representations set
forth herein. The Warrant Holder represents that it is experienced in evaluating
companies such as the Company, has such knowledge and experience in financial
and business matters as to be capable of evaluating the merits and risks of its
investment and has the ability to suffer the total loss of the investment. The
Warrant Holder further represents that it has had the opportunity to ask
questions of and receive answers from the Company concerning the terms and
conditions of the Warrants, the business of the Company, and to obtain
additional information to such Warrant Holder's satisfaction.

            (g) Accredited Investor. The Warrant Holder is an "Accredited
Investor" within the meaning of Rule 501 of Regulation D under the Securities
Act, as presently in effect.

      12. Compliance with Securities Act; Transferability of Warrant or Shares
of Common Stock.

            (a) Compliance with Securities Act. The Warrant Holder, by
acceptance hereof, agrees that the Warrants, and the shares of Common Stock to
be issued upon exercise of the Warrants, are being acquired for investment and
that such Warrant Holder will not offer, sell or otherwise dispose of the
Warrants, or any shares of Common Stock to be issued upon exercise of the
Warrants except under circumstances which will not result in a violation of the
Securities Act of 1933, as amended (the "Securities Act"), or any applicable
state securities laws. The Warrants and all shares of Common Stock issued upon
exercise of the Warrants (unless registered under) the Securities Act and any
applicable state securities laws) shall be stamped or imprinted with a legend in
substantially the following form:

           "THESE SECURITIES HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT
           OF 1933, AS AMENDED, OR ANY STATE SECURITIES LAW. THEY MAY NOT BE
           SOLD OR OFFERED FOR SALE, PLEDGED, HYPOTHECATED OR OTHERWISE
           TRANSFERRED IN THE ABSENCE OF AN EFFECTIVE REGISTRATION STATEMENT
           RELATED THERETO UNDER SAID ACT AND APPLICABLE STATE SECURITIES LAWS
           OR UNLESS THE COMPANY HAS RECEIVED AN OPINION OF COUNSEL THAT SUCH
           REGISTRATION IS NOT REQUIRED TO EFFECTUATE SUCH TRANSACTION."

                                      -7-
<PAGE>

      (b) Exchange, Transfer, Assignment. The Warrants cannot be exchanged,
transferred or assigned otherwise than in accordance with applicable law. Upon
compliance with applicable law and surrender of the Warrants to the Company with
the Assignment Form annexed hereto as Exhibit B duly executed, and funds
sufficient to pay any transfer tax, the Company shall, without charge, execute
and deliver a new Warrant Agreement in the name of the heir, devisee or assignee
named in such instrument of assignment and this Warrant Agreement shall promptly
be canceled. Subject to the terms hereof, the Warrants may be assigned in whole
or in part.

      13. Restricted Securities. The Warrant Holder understands that the
Warrants and the Shares issuable upon vesting and exercise of the Warrants, will
not be registered at the time of their issuance under the Securities Act for the
reason that the sale provided for in this Agreement is exempt pursuant to
Section 4(2) of the Securities Act based on the representations of the warrant
Holder set forth herein. The Warrant Holder represents that it is experienced in
evaluating companies such as the Company, has such knowledge and experience in
financial and business matters as to be capable of evaluating the merits and
risks of its investment and has the ability to suffer the total loss of the
investment. The Warrant Holder further represents that it has had the
opportunity to ask questions of and receive answers from the Company concerning
the terms and conditions of the Warrants, the business of the Company, and to
obtain additional information to such Warrant Holder's satisfaction. The Warrant
Holder is an "Accredited Investor" within the meaning of Rule 501 of Regulation
D under the Securities Act, as presently in effect.

      14. Registration Rights. Upon the parties' execution of this Warrant
Agreement and the Acknowledgment and Agreement to the Amended and Restated
Registration Rights Agreement attached hereto as Exhibit C, Warrant Holder shall
be made a party to that certain Amended and Restated Registration Rights
Agreement, dated as of December 8, 1998, by and among the Company, the
stockholders of the Company named therein and such other stockholders and
warrant holders of the Company made a party thereto. In addition, within 30 days
of the execution of this Warrant Agreement, the Company agrees to enter into an
agreement with Warrant Holder, in form and substance reasonably satisfactory to
Warrant Holder, which shall grant Warrant Holder the right to transfer its
registration rights pursuant to such Amended and Restated Registration Rights
Agreement dated as of December 8, 1998 to any assignee or assignees of all or
any part of this Warrant or the Shares issuable upon exercise hereof, which
assignees, upon their execution and delivery of an Acknowledgment and Agreement
to the Amended and Restated Registration Rights Agreement substantially in the
form of Exhibit C hereto (with appropriate changes therein) shall each have all
the rights and obligations of a Demand Stockholder (as defined in such
Agreement) under such Agreement; provided that no registration statement with
respect to less than a minimum of 250,000 Shares shall be required to be
effected by the Company thereunder for the benefit of any such assignee.

      15. Miscellaneous.

            (a) No Consequential Damages. No party hereto shall be entitled to
consequential damages as a result of any breach of a covenant, representation or
warranty contained herein.

            (b) Notices. All notices, demands and other communications provided
for or permitted hereunder shall be made in writing and shall be by registered
or certified first-class mail, return receipt requested, telecopier, courier
service or personal delivery:

                  (i)   if to the Company, to:

                        priceline.com Incorporated
                        Five High Ridge Park
                        Stamford, CT 06905
                        Telecopy:  (203) 595-8345
                        Attention:  Melissa M. Taub, Esq.

                                      -8-
<PAGE>

                  and to:

                        Skadden, Arps, Slate, Meagher, & Flom, L.L.P.
                        One Rodney Square
                        Wilmington, DE  19801
                        Telecopy:  (302) 651-3001
                        Attention:  Patricia Moran Chuff, Esq.

                  (ii)  if to the Warrant Holder, to:

                        Northwest Airlines, Inc.
                        5101 Northwest Drive
                        Saint Paul, Minnesota  55111-3034
                        Attention:
                        Title:
                        Phone:
                        Fax:  612-726-0771

                  and to:

                        Northwest Airlines, Inc.
                        5101 Northwest Drive
                        St. Paul, Minnesota  55111-3034
                        Telephone:
                        Telecopy: 612-726-0771
                        Attention:

            All such notices and communications shall be deemed to have been
duly given when delivered by hand, if personally delivered; when delivered by
courier, if delivered by commercial courier service; five (5) business days
after being deposited in the mail, postage prepaid, if mailed; and when receipt
is mechanically acknowledged, if telecopied.

            (d) Successors and Assigns; Third Party Beneficiaries. This
Agreement shall inure to the benefit of and be binding upon the successors and
permitted assigns of the parties hereto. No person, other than the parties
hereto and their successors and permitted assigns, is intended to be a
beneficiary of this Agreement.

            (e) Amendment and Waiver.

                  (i) No failure or delay on the part of the Company, or the
Warrant Holder in exercising any right, power or remedy hereunder shall operate
as a waiver thereof, nor shall any single or partial exercise of any such right,
power or remedy preclude any other or further exercise thereof or the exercise
of any other right, power or remedy. The remedies provided for herein are
cumulative and are not exclusive of any remedies that may be available to the
Company and the Warrant Holder at law, in equity or otherwise.

                  (ii) Any amendment, supplement or modification of or to any
provision of this Warrant Agreement, any waiver of any provision of this Warrant
Agreement, and any consent to any departure by the Company or the Warrant Holder
from the terms of any provision of this Agreement, shall be effective only if it
is made or given in writing and signed by the Company and the Warrant Holder.

                                      -9-
<PAGE>

            (f) Counterparts. This Warrant Agreement may be executed in any
number of counterparts and by the parties hereto in separate counterparts, each
of which when so executed shall be deemed to be an original and all of which
taken together shall constitute one and the same agreement.

            (g) Headings. The headings in this Warrant Agreement are for
convenience of reference only and shall not limit or otherwise affect the
meaning hereof.

            (h) GOVERNING LAW. THIS WARRANT AGREEMENT SHALL BE GOVERNED BY AND
CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF DELAWARE, WITHOUT REGARD
TO THE PRINCIPLES OF CONFLICTS OF LAW OF ANY JURISDICTION.

            (i) Severability. If any one or more of the provisions contained
herein, or the application thereof in any circumstance, is held invalid, illegal
or unenforceable in any respect for any reason, the validity, legality and
enforceability of any such provision in every other respect and of the remaining
provisions hereof shall not be in any way impaired, unless the provisions held
invalid, illegal or unenforceable shall substantially impair the benefits of the
remaining provisions hereof.

            (j) Entire Agreement. This Warrant Agreement, together with the
exhibits hereto is intended by the parties as a final expression of their
agreement and intended to be a complete and exclusive statement of the agreement
and understanding of the parties hereto in respect of the subject matter
contained herein. This Warrant Agreement, together with the exhibits hereto,
supersedes all prior agreements and understandings between the parties with
respect to such subject matter.

            (k) Publicity. Except as may be required by law, none of the parties
hereto shall issue a publicity release or public announcement or otherwise make
any disclosure concerning this Warrant Agreement or the transactions
contemplated hereby, without prior approval by the other party (which approval
shall not be unreasonably withheld); provided, however, that nothing in this
Warrant Agreement shall restrict the Warrant Holder from disclosing information
(a) that is already publicly available and (b) to its attorneys, accountants,
consultants and other advisors to the extent necessary to obtain their services
in connection with the Warrant Holder's investment or participation in the
Company. If any announcement is required by law to be made by any party hereto
concerning this Warrant Agreement or the transactions contemplated hereby, prior
to making such announcement such party will deliver a draft of such announcement
to the other parties and shall give the other parties an opportunity to comment
thereon.

            (l) Charges; Taxes and Expenses. Issuance of certificates for shares
upon the exercise of the Warrants shall be made without charge to the Warrant
Holder for any issue or transfer tax or other incidental expense in respect of
the issuance of such certificates, all of which taxes and expenses shall be paid
by the Company.

            (m) Saturdays, Sundays, Holidays, Etc. If the last or appointed day
for the taking of any action or the expiration of any right required or granted
herein shall be a Saturday, Sunday or a legal holiday, then such action may be
taken or such right may be exercised on the next succeeding day not a Saturday,
Sunday or a legal holiday.

            (n) Lost Warrants. The Company covenants to the Warrant Holder that,
upon receipt of evidence reasonably satisfactory to the Company of the loss,
theft, destruction or mutilation of this Warrant Agreement and, in the case of
any such loss, theft or destruction, upon receipt of an indemnity reasonably
satisfactory to the Company, or in the case of any such mutilation, upon
surrender and cancellation of this Warrant Agreement, the Company will make and
deliver a new Warrant Agreement of like tenor, in lieu of the lost, stolen,
destroyed or mutilated document.

                                      -10-
<PAGE>

            (o) Further Assurances. Each of the parties shall execute such
documents and perform such further acts (including, without limitation,
obtaining any consents, exemptions, authorizations or other actions by, or
giving any notices to, or making any filings with, any governmental authority or
any other person, and otherwise fulfilling, or causing the fulfillment of, the
various obligations made herein), as may be reasonably required or desirable to
carry out or to perform the provisions of this Warrant Agreement and to
consummate and make effective as promptly as possible the transactions
contemplated by this Warrant Agreement.

IN WITNESS WHEREOF, this Warrant Agreement has been duly executed and delivered
by the authorized officers of each of the undersigned.

                                    PRICELINE.COM INCORPORATED

                                    By:__________________________________
                                        Name:
                                        Title:

                                    NORTHWEST AIRLINES, INC.

                                    By:__________________________________
                                        Name:
                                        Title:

                                      -11-
<PAGE>

EXHIBIT A

NOTICE OF EXERCISE

To: priceline.com Incorporated

            1. ___ The undersigned hereby elects to purchase __________ shares
of the Common Stock of priceline.com Incorporated pursuant to the terms of the
Participation Warrant Agreement, dated as of _________________, 1999, by and
between priceline.com Incorporated and the undersigned (the "Warrant
Agreement"), and tenders herewith payment of the purchase price of such shares
in full.

            ___ The undersigned hereby elects to convert ___________ percent
(____%) of the value of the Warrants pursuant to the provisions of Section 5(b)
of the Warrant Agreement.

            2. Please issue a certificate or certificates representing said
shares in the name of the undersigned.

                                     NORTHWEST AIRLINES, INC.

                                     By:________________________________

                                     ___________________________________
                                     (Print Name of Signatory)

                                     ___________________________________
                                     (Title of Signatory)

Date:_____________________

                                      -12-
<PAGE>

EXHIBIT B

ASSIGNMENT FORM

TO: priceline.com Incorporated

The undersigned hereby assigns and transfers unto _____________________________
of _________________________________________________________________
               (Please typewrite or print in block letters)
the right to purchase ____________ shares of the common stock of priceline.com
Incorporated subject to the Participation Warrant Agreement, dated as of
________________, 1999, by and between priceline.com Incorporated and the
undersigned (the "Warrant Agreement").

This assignment complies with the provisions of Section 12(b) of the Warrant
Agreement and is accompanied by funds sufficient to pay all applicable transfer
taxes.

                                     NORTHWEST AIRLINES, INC.

                                     By:________________________________

                                     ___________________________________
                                     (Print Name of Signatory)

                                     ___________________________________
                                     (Title of Signatory)

Date:_____________________
<PAGE>

Exhibit C

ACKNOWLEDGMENT AND AGREEMENT
TO THE AMENDED AND RESTATED REGISTRATION RIGHTS AGREEMENT

      WHEREAS, pursuant to a Participation Warrant Agreement, the undersigned
received a warrant to purchase 500,000 shares of common stock, par value $.008
per share (the "Shares"), of priceline.com Incorporated, a Delaware corporation
(the "Company"); and

WHEREAS, the undersigned wishes to receive certain registration rights with
respect to such Shares; and

      WHEREAS, the undersigned has reviewed a copy of that certain Amended and
Restated Registration Rights Agreement, dated as of December 8, 1998 (the
"Agreement"), among the Company, General Atlantic Partners 48, L.P., GAP
Coinvestment Partners, L.P., General Atlantic Partners 50, L.P. and the
stockholders named therein and has been given a copy of the Agreement and
afforded ample opportunity to read and to have counsel review it, and the
undersigned is thoroughly familiar with its terms.

      NOW, THEREFORE, in consideration of the mutual premises contained herein
and in the Agreement and for other good and valuable consideration, the receipt
and sufficiency of which is hereby acknowledged, the undersigned hereby
acknowledges and agrees that (i) the undersigned has been given a copy of the
Agreement and afforded ample opportunity to read and to have counsel review it,
and the undersigned is thoroughly familiar with its terms, (ii) the Shares are
subject to terms and conditions set forth in the Agreement, (iii) the
undersigned does hereby agree fully to be bound by the Agreement as a "Demand
Stockholder" (as therein defined), and upon the execution and delivery of this
Acknowledgment and Agreement by the Company, the undersigned shall have all the
rights and obligations under the Agreement as a Demand Stockholder, and (iv) the
undersigned does hereby name _________________to serve as their representative
under the Agreement.

      This 17th day of November, 1999.

Acknowledged and agreed:

PRICELINE.COM INCORPORATED                  NORTHWEST AIRLINES, INC.

By: _____________________________           By:_________________________
    Name:                                      Name:
    Title:                                     Title:

                                      -2-

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