<PAGE>   1
                                                                   EXHIBIT 10.15

                                 July 27, 2000


flightserv.com
3343 Peachtree Road, N.E.
Suite 530
Atlanta, GA 30326


                  RE:  TERMINATION OF THE EMPLOYMENT AGREEMENT BETWEEN C.
                       BEVERLY LANCE AND FLIGHTSERV.COM

Gentlemen:


         This Letter Agreement (the "Agreement"), when countersigned by you,
will confirm our agreement with respect to the termination of my employment
agreement dated January 1, 1999, (the "Employment Agreement") between
flightserv.com (the "Company") and myself and my engagement by the Company as a
consultant.

         1.       TERMINATION OF EMPLOYMENT AGREEMENT

                  The Employment Agreement is hereby terminated as of July 27,
2000, and neither the Company nor I shall have any obligations arising out of
or relating to the Employment Agreement.

         2.       COMPENSATION

         For the six months beginning July 27, 2000, and ending on January 26,
2001, I consent and agree to provide consulting services to the Company;
provided, however, I shall not be obligated to consult for any fixed or set
hours, nor will my consulting agreement preclude me from accepting other
employment. As full and complete compensation for my agreement to provide
consulting services herein, and for any such services so provided, the Company
shall promptly transfer to me full and complete and unencumbered title to that
certain 1999 model Lincoln Navigator with the vehicle identification number
5LMPU28A6XLJ17756 which the Company is currently providing me pursuant to my
employment agreement.


<PAGE>   2


         3.       GENERAL RELEASE AND OTHER AGREEMENTS OF C. BEVERLY LANCE

         In exchange for the consideration provided by the Company pursuant to
this Agreement, I enter into the following release (hereinafter the "General
Release"):

                  (a)      Except for the rights and obligations provided by or
arising under this Agreement, I hereby release, acquit, withdraw, retract and
forever discharge any and all claims, manner of actions, causes of action, in
law or in equity, suits, judgments, debts, liens, contracts, agreements,
promises, liabilities, demands, damages, losses, costs, expenses or disputes,
known or unknown, fixed or contingent, which I now have or may have hereafter,
directly or indirectly, personally or in a representative capacity, against the
Company, and its successors, administrators, fiduciaries, parents,
subsidiaries, affiliates, officers, directors, shareholders, representatives,
agents, employees, and all persons acting through or in connection with the
Company by reason of any act, omission, matter, cause or thing whatsoever, from
the beginning of time to, and including, the date of execution of this
Agreement. This General Release includes, but is not limited to, all claims,
manner of actions, causes of action in law or in equity, suits, judgments,
debts, liens, contracts, agreements, promises, liabilities, demands, damages,
losses, costs, expenses or disputes, known or unknown, fixed or contingent,
which arise under Title VII of the Civil Rights Act of 1964, as amended; The
Americans with Disabilities Act; The Employee Retirement Income Security Act of
1974, as amended; the Georgia Equal Employment for Persons with Disabilities
Code; any other federal, state or local statute or ordinance respecting
discriminatory hiring or employment practices or civil rights laws based on
protected class status; common law claims of intentional or negligent
infliction of emotional distress, negligent hiring, breach of contract, breach
of the covenant of good faith and fair dealing, promissory estoppel,
negligence, wrongful termination of employment; and all other claims of any
type or nature, including any claim in contract or tort, and including any
claim for attorneys' fees. The parties intend that this General Release shall
discharge all claims against the released parties to the extent permitted by
law, but shall not discharge claims arising out of any events which may occur
after the date of execution of this Agreement nor shall this General Release
release or adversely affect any of my rights to indemnification pursuant to the
Company's certificate of incorporation, bylaws, separate agreements of
indemnity, and officers and directors liability insurance all of which the
Company agrees by its signature hereto that I retain in full in accordance with
the respective terms thereof. The Company acknowledges that there is presently
in force a valid and enforceable existing agreement of indemnity between the
Company and me, a copy of which shall be attached as an exhibit to this
Agreement.

                  (b)      Except as necessary to enforce the terms of this
Agreement, I may not sue the Company or any other released party concerning any
of the matters covered by this Agreement. In the event that I sue the Company
or any other released party concerning any of the matters covered by this
Agreement, I agree that I will forfeit or tender back to the Company all
compensation provided to me under, or in respect of, Section 2 of this
Agreement.


<PAGE>   3


                  (c)      I warrant and represent that I have filed no charge
or complaint against the Company, nor commenced any other administrative action
against the Company in any local, state or federal agency. I further warrant
and represent that I am not presently a named plaintiff in any lawsuit, filed
in any jurisdiction, in which the Company is a party. In the event that any of
these warranties and representations are incorrect, the Company shall have the
absolute right (but not the obligation) to terminate this Agreement, and to
demand and have immediately returned to the Company all consideration paid by
it to me pursuant to this Agreement. Further, the Company shall be entitled to
be indemnified and held harmless by me for any breach of the warranty and
representation contained in this Section, and to recover from me all costs and
expenses incurred as a result of my breach of the warranty and representation
contained in this Section, and all costs and expenses incurred in defending any
now pending legal or administrative proceeding, in which I am a named party.
Costs and expenses, for purposes of this Section, shall include, but not be
limited to, attorneys' fees and other legal costs.

                  (d)      Nothing in this Agreement should be construed as a
release by me of, or an agreement by me not to sue on, any charges, complaints,
claims, liabilities, obligations, promises, agreements, controversies, damages,
costs, losses, debts, or expenses arising out of any matter, cause, acts,
conduct, claims, or events which may occur after the date of execution of this
Agreement. Further, I shall not be deemed to have released any vested rights
under any stock option plan.

                  (e)      Neither the negotiation, undertaking or signing of
this Agreement constitutes or operates as an acknowledgment or admission by the
Company, or any other released party, that any of them have violated or failed
to comply with any provision of federal or state constitutions, statutes or
laws, including but not limited to those set forth in Section 2(a) above or
that any claims under the principles of common law, including but not limited
to those set forth in Section 2(a) above, exist or may exist.

         4.       GENERAL RELEASE AND OTHER AGREEMENTS OF THE COMPANY

                  (a)      In exchange for the consideration provided by me
pursuant to this Agreement, the Company enters into the following release:

                  Except for the rights and obligations provided by or arising
under this Agreement, the Company hereby releases, acquits, withdraws, retracts
and forever discharges any and all claims, manner of actions, causes of action,
in law or in equity, suits, judgments, debts, liens, contracts, agreements,
promises, liabilities, demands, damages, losses, costs, expenses or disputes,
known or unknown, fixed or contingent, which it now has or may have hereafter,
directly or indirectly, personally or in a representative capacity, against me
by reason of any act, omission, matter, cause or thing whatsoever, from the
beginning of time to, and including, the date of execution of this Agreement.
This General Release includes, but is not limited to, all claims, manner of
actions, causes of action in law or in equity, suits, judgments, debts, liens,
contracts, agreements, promises, liabilities, demands, damages, losses, costs,
expenses or disputes, known or unknown, fixed or contingent, which arise under
any federal, state or local statute or ordinance; common law claims; and all
other claims of any type or nature,


<PAGE>   4


including any claim in contract or tort, and including any claim for attorneys'
fees. The parties intend that this release shall discharge all claims against
me to the extent permitted by law, but shall not discharge claims arising out
of any events which may occur after the date of execution of this Agreement.

                  (b)      Except as necessary to enforce the terms of this
Agreement, the Company may not sue me concerning any of the matters covered by
this Agreement. In the event that the Company sues me concerning any of the
matters covered by this Agreement, the Company will forfeit or tender back to
me all consideration provided by me to it under, or in respect of, Section 2 of
this Agreement.

                  (c)      the Company warrants and represents that it is not
presently a named plaintiff in any lawsuit, filed in any jurisdiction, in which
the I am a party. In the event that this warranty and representation is
incorrect, I shall have the absolute right (but not the obligation) to
terminate this Agreement, and to demand and have immediately returned to me all
consideration paid by me to the Company pursuant to this Agreement. Further, I
shall be entitled to be indemnified and held harmless by the Company for any
breach of the warranty and representation contained in this Section, and to
recover from the Company all costs and expenses incurred as a result of the
Company's breach of the warranty and representation contained in this Section,
and all costs and expenses incurred in defending any now pending legal or
administrative proceeding, in which the Company is a named party. Costs and
expenses, for purposes of this Section, shall include, but not be limited to,
attorneys' fees and other legal costs.

                  (d)      Nothing in this Agreement should be construed as a
release by the Company of, or an agreement by the Company not to sue on, any
charges, complaints, claims, liabilities, obligations, promises, agreements,
controversies, damages, costs, losses, debts, or expenses arising out of any
matter, cause, acts, conduct, claims, or events which may occur after the date
of execution of this Agreement.

                  (e)      Neither the negotiation, undertaking or signing of
this Agreement constitutes or operates as an acknowledgment or admission by me
that I have violated or failed to comply with any provision of federal or state
constitutions, statutes or laws, including but not limited to those set forth
in Section 3(a) above or that any claims under the principles of common law,
including but not limited to those set forth in Section 3(a) above, exist or
may exist.

                  (f)      the Company represents and agrees that it has had a
full and adequate opportunity to discuss and consider any claims that it
believes it may have against me. Further, the Company represents and agrees
that: (i) this Agreement is written in an understandable manner; (ii) this
Agreement and the promises made in this Agreement by the Company are granted in
exchange for consideration which is in addition to anything of value to which
the Company is otherwise entitled; (iii) the payments and other consideration
provided by me pursuant to this Agreement constitute adequate consideration for
the affirmations, waivers, releases, discharges and other agreements made by
the Company in this Agreement; (iv) the payments and other consideration
provided by me pursuant to this Agreement are accepted by the Company as full
and final satisfaction for any claim against me available to the Company under


<PAGE>   5


the law; (v) the Company has been advised to, and has had an opportunity to
consult with, an attorney prior to deciding whether to enter into this
Agreement; (vi) the Company has been given adequate time, and at least
twenty-one (21) days, within which to consider this Agreement prior to
executing it; and (vii) the Company's President and Secretary of the Company
have the power and authority to contract on behalf of the Company, and to bind
the Company to this Agreement.

         In consideration of the forgoing, the Company hereby unconditionally
releases me from all obligations under the Employment Agreements and
unconditionally waives all rights granted to the Company thereunder.

                                                     Very truly yours,



                                                     C. Beverly Lance



Confirmed and agreed:


flightserv.com

---------------------------
By:
Its: