Document:

<PAGE>

EXHIBIT ___                                                       CONFORMED COPY

                            SECURED PROMISSORY NOTE
                            -----------------------

US$*                                                           December 30, 1999

     FOR VALUE RECEIVED, the undersigned MIDWAY AIRLINES CORPORATION, a Delaware
corporation ("Borrower") hereby promises to pay to the order of FLEET CAPITAL
CORPORATION, a Rhode Island Corporation (the "Lender"):

           (a)   the principal sum of US$*, in the number of installments set
     forth in Annex A hereto, and each installment to be due and payable on a
     Payment Date and in an amount equal to the amount set forth in Annex A
     hereto opposite such Payment Date;

           (b)   interest on the unpaid principal amount hereof from time to
     time outstanding from and including the date hereof until such principal
     amount if paid in full at the Applicable Rate, payable in arrears on each
     Payment Date and on the date this Note is paid in full; and

           (c)   interest at the Past Due Rate on any principal hereof, and, to
     the extent permitted by Applicable Law, interest and other amounts due
     hereunder, not paid when due (whether at stated maturity, by acceleration
     or otherwise), for any period during which the same shall be overdue,
     payable on demand by the Lender.

     All capitalized terms used in this Note and not otherwise defined herein
shall have the same meanings herein as in the Loan Agreement. This Note
evidences a borrowing under and has been issued by the Borrower in accordance
with the terms of the Load Agreement. Each of the Lender and any transferee of
the Lender under Section 5.01(b) of the Loan Agreement is entitled to the
benefits of the Loan Agreement, the Security Agreement and the other Operative
Agreements.

     The Borrower has the right in certain circumstances and the obligation
under certain other circumstances to prepay the whole of the principal of this
Note on the terms and conditions specified in the Loan Agreement.

     If any one or more of the Events of Default shall occur, the entire unpaid
principal amount of this Note and all of the unpaid interest accrued thereon may
become or be declared due and payable in the manner and with the effect provided
in the Loan Agreement.

* Confidential treatment has been requested for omitted information. Omitted
information has been filed separately with the Commission.

<PAGE>

     No delay or omission on the part of the Lender in exercising any right
hereunder shall operate as waiver of such right or of any other rights of the
Lender, nor shall any delay, omission or waiver on any one occasion be deemed a
bar or waiver of the same or any other right on any further occasion.

     The Borrower hereby waives to the extent permitted by law, presentment,
demand, notice protest and all other demands and notices in connection with the
delivery, acceptance, performance, default or enforcement of this Note, and
assents to any extension or postponement of the time of payment or any other
indulgence, to any release of collateral and to the addition or release of any
other party or person primarily or secondarily liable.

     THIS NOTE IS BEING DELIVERED IN THE STATE OF NEW YORK, AND THIS NOTE AND
THE OBLIGATIONS OF THE BORROWER HEREUNDER SHALL BE GOVERNED BY AND SHALL BE
CONSTRUED AND ENFORCED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK.

                 [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]

                                       2
<PAGE>

        IN WITNESS WHEREOF, the undersigned has caused this Note to be executed
by its duly authorized officer as of the day and year first written above.

                                       MIDWAY AIRLINES CORPORATION
                                        as Borrower

                                       By: /s/ Jonathan S. Waller
                                           -----------------------------
                                           Name: Jonathan S. Waller
                                           Title: Senior Vice President
                                                       General Counsel

                                       3
<PAGE>

                                                              Annex A to Secured
                                                              Promissory Note

                             Amortization Schedule
                             ---------------------

          Payment Date                            Amount
          ------------                            ------
                *                                   *

* Confidential treatment has been requested for omitted information. Omitted
information has been filed separately with the Commission.<PAGE>

                                                                   EXHIBIT 10.84

                                                                  CONFORMED COPY
                                                                  --------------

                            SECURED PROMISSORY NOTE
                            -----------------------

US$*                                                            January 25, 2000

     FOR VALUE RECEIVED, the undersigned MIDWAY AIRLINES CORPORATION , a
Delaware corporation ("Borrower") hereby promises to pay to the order of FLEET
CAPITAL CORPORATION, a Rhode Island Corporation (the "Lender"):

          (a)   the principal sum of US$*, in the number of installments set
     forth in Annex A hereto, and each installment to be due and payable on a
     Payment Date and in an amount equal to the amount set forth in Annex A
     hereto opposite such Payment Date;

          (b)   interest on the unpaid principal amount hereof from time to time
     outstanding from and including the date hereof until such principal amount
     is paid in full at the Applicable Rate, payable in arrears on each Payment
     Date and on the date this Note is paid in full; and

          (c)   interest at the Past Due Rate on any principal hereof, and, to
     the extent permitted by Applicable Law, interest and other amounts due
     hereunder, not paid when due (whether at stated maturity, by acceleration
     or otherwise), for any period during which the same shall be overdue,
     payable on demand by the Lender.

     All capitalized terms used in this Note and not otherwise defined herein
shall have the same meanings herein as in the Loan Agreement.  This Note
evidences a borrowing under and has been issued by the Borrower in accordance
with the terms of the Loan Agreement. Each of the Lender and any transferee of
the Lender under Section 5.01(b) of the Loan Agreement is entitled to the
benefits of the Loan Agreement, the Security Agreement and the other Operative
Agreements.

     The Borrower has the right in certain circumstances and the obligation
under certain other circumstances to prepay the whole of the principal of this
Note on the terms and conditions specified in the Loan Agreement.

     If any one or more of the Events of Default shall occur, the entire unpaid
principal amount of this Note and all of the unpaid interest accrued thereon may
become or be declared due and payable in the manner and with the effect provided
in the Loan Agreement.

* Confidential treatment has been requested for omitted information.  Omitted
information has been filed separately with the Commission.
<PAGE>

     No delay or omission on the part of the Lender in exercising any right
hereunder shall operate as a waiver of such right or of any other rights of the
Lender, nor shall any delay, omission or waiver on any one occasion be deemed a
bar or waiver of the same or any other right on any further occasion.

     The Borrower hereby waives to the extent permitted by law, presentment,
demand, notice, protest and all other demands and notices in connection with the
delivery, acceptance, performance, default or enforcement of this Note, and
assents to any extension or postponement of the time of payment or any other
indulgence, to any release of collateral and to the addition or release of any
other party or person primarily or secondarily liable.

     THIS NOTE IS BEING DELIVERED IN THE STATE OF NEW YORK, AND THIS NOTE AND
THE OBLIGATIONS OF THE BORROWER HEREUNDER SHALL BE GOVERNED BY, AND SHALL BE
CONSTRUED AND ENFORCED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK.

                 [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK.]

                                       2
<PAGE>

     IN WITNESS WHEREOF, the undersigned has caused this Note to be executed by
its duly authorized officer as of the day and year first written above.

                                   MIDWAY AIRLINES CORPORATION,
                                   as Borrower

                                   By:  /s/ Jonathan S. Waller
                                      ------------------------
                                      Name: Jonathan S. Waller
                                      Title: Senior Vice President
                                             General Counsel

                                       3
<PAGE>

                                                             Annex A to Secured
                                                             Promissory Note

                             Amortization Schedule
                             ---------------------

          Payment Date                        Amount
          ------------                        ------
               *                                *

* Confidential treatment has been requested for omitted information.  Omitted
information has been filed separately with the Commission.<PAGE>

                                                                  Exhibit 10.13

                           INTERIM SERVICES AGREEMENT

This Interim Services Agreement is made as of the _____ day of September, 1999,
between Snyder Communications, Inc., a Delaware corporation ("Snyder"), and
Ventiv Health, Inc., a Delaware corporation ("Ventiv"). Capitalized terms used
herein but not otherwise defined herein shall have the meanings ascribed to such
terms in that certain Distribution Agreement, dated as of September__, 1999, by
and between Snyder and Ventiv (the "Distribution Agreement").

In consideration of the premises and mutual covenants herein contained and
intending to be legally bound thereby, the parties hereto agree as follows:

1.  PURPOSES.

1.1  Pursuant to the Distribution Agreement and certain other agreements to be
executed among Snyder, Ventiv and certain Subsidiaries thereof, Snyder will
transfer its healthcare services business to Ventiv, and thereafter, Snyder will
distribute to holders of Snyder Common Stock on the Distribution Date one share
of Common Stock of Ventiv for every three shares of Snyder Common Stock held by
such holders of record on the Record Date. Snyder will distribute in the
Distribution all of the issued and outstanding shares of capital stock of
Ventiv, and thereafter, Ventiv will be a corporation independent of Snyder.

1.2  Prior to the Distribution Date, Snyder provided certain services to and on
behalf of its healthcare services business.

1.3  After the Distribution Date, Ventiv will require for a limited term that
Snyder provides certain administrative and support services to Ventiv and its
Subsidiaries until Ventiv and its Subsidiaries are able to otherwise contract or
arrange for such services.

2.  TERM.  Subject to the provisions of Section 5 hereof, this Agreement shall
be effective on the Distribution Date and shall continue until the earlier of
(i) one (1) year following the Distribution Date, and (ii) termination of all
Services (as herein defined) pursuant to Section 5 of this Agreement ("Term").

3.  AGREEMENT TO PERFORM SELECTED SERVICES.

3.1  Subject to all of the terms and conditions hereof, Snyder and Ventiv hereby
agree that Snyder shall make available to Ventiv and its Subsidiaries
during the Term those services described on Schedule A hereto (the "Services").
-------------------------------------------------------------------------------

Services heretofore provided by Snyder to Ventiv will be provided on a basis
consistent with prior practice. Services to be provided hereunder that were not
heretofore provided by Snyder shall be provided on a reasonably timely basis.
Charges for Services shall be as set forth in Section 4 hereof.

3.2  If Ventiv elects to utilize any available Services not previously utilized
prior to the Distribution Date, it shall notify Snyder in writing of those
Services it elects to use. If no such notice is given by the Distribution Date,
Snyder shall have no further obligation to furnish such new Services.

4.  CHARGES FOR SERVICES; PAYMENT.

4.1  It is the intention of the parties hereto that the charges for Services
requested and provided hereunder shall consist of fully allocated direct and
indirect costs of providing Services but without any profit to Snyder.

4.2  Snyder shall bill Ventiv monthly for all charges for Services provided
hereunder, which bill shall be accompanied by reasonable documentation or
explanation supporting such charges, and Ventiv shall pay Snyder in full for all
charges for Services within thirty (30) days after receipt of such bill and
other documentation or explanation.

5.  REDUCTION IN SERVICES; TERMINATION.

5.1  The parties recognize that during the Term hereof the requirements of
Ventiv for certain Services will decrease and that Ventiv intends to reduce or
completely phase out any Services no longer required.  Accordingly, at any time
after the Distribution Date, Ventiv may request termination of all or any part
of the Services received from Snyder (including termination of any part of any
individual Service) by giving Snyder not less than ninety (90) days' advance
notice in writing of any anticipated termination of any Services or part thereof
and, to the extent practicable, the parties will agree to an orderly reduction
or phase-out of such Services.
<PAGE>

Once a Service is discontinued, Snyder shall not again be obligated to later
reinstate such Service.

5.2  Following the termination or discontinuance of any Service as provided
herein, to the extent Snyder is thereafter requested to provide any terminated
or discontinued Service, including any transition-related assistance necessary
for Ventiv to perform the terminated or discontinued Service, and Snyder
consents to perform such Service, Snyder shall be entitled to compensation
reflecting incurred costs in accordance with Section 4.1 herein.

6.  MUTUAL COVENANT.  Except to the extent otherwise provided herein, Snyder
covenants and warrants that the charges for Services hereunder are and shall be
determined in a fair and equitable manner.

7.  FORCE MAJEURE.  If either party is unable to perform any of its duties or
fulfill any of its covenants or obligations under this agreement as a result of
causes beyond its control and without its fault or negligence, including but not
limited to acts of god or government, fire, flood, war, governmental controls,
and labor strife, then such party shall not be deemed to be in default of this
agreement during the continuance of such events which rendered it unable to
perform; such party shall have such additional time thereafter as is reasonably
necessary to enable it to resume performance of its duties and obligations under
this agreement; and Ventiv shall not be required to pay Snyder for any service
to the extent that Snyder is unable to perform. Notwithstanding the foregoing,
if the suspension of a party's obligation to perform under this agreement is of
such a nature or duration as to substantially frustrate the purpose of this
agreement, then Snyder or Ventiv, as the case may be, shall have the right to
terminate this agreement by giving to the other thirty (30) days' prior written
notice of termination, in which case termination shall be effective upon the
expiration of such thirty (30) day period unless performance is resumed prior to
such expiration.

8.  COMPLETE AGREEMENT.  This Agreement, the Exhibits and Schedules hereto and
the agreements and other documents referred to herein shall constitute the
entire agreement between the parties hereto with respect to the subject matter
hereof and shall supersede all previous negotiations, commitments and writings
with respect to such subject matter.

9.  SEVERABILITY.  The invalidity of any provision of this agreement as
determined by a court of competent jurisdiction in no way shall affect the
validity of any other provision hereof.  if a provision is determined to be
invalid, the parties shall negotiate in good faith in an effort to agree upon a
suitable and equitable alternative provision to effect the original intent of
the parties.

10.  TIME OF THE ESSENCE.  The parties hereto agree that with respect to the
performance of all terms, conditions and covenants of this agreement, time is of
the essence.

11.  CAPTIONS.  Section captions are not a part hereof and are merely for the
convenience of the parties.

12.  BINDING EFFECT; CHOICE OF LAW.  Subject to any provisions hereof, this
agreement shall bind the parties, their successors and assigns. this agreement
shall be governed by the laws of the state of delaware without reference to the
conflict or choice of law provisions thereof.

13.  ASSIGNMENT.  Neither party shall assign or sublease this agreement or any
service to be provided hereunder without the prior written consent of the other,
which consent shall not be unreasonably withheld.  notwithstanding the
foregoing, consent shall not be required for an assignment or sublease of this
agreement or any service provided hereunder by Snyder to a subsidiary of Ventiv
or to any third party vendor or third party recordkeeper who had been providing
all or a material portion of the services to or on behalf of snyder prior to the
distribution date.

14.  AMENDMENT.  This agreement may not be amended without the express written
agreement of all parties hereto.

15. NOTICES. All notices under this agreement must be in writing and delivered
personally or sent by united states mail, postage prepaid, addressed as follows,
except that any party by written notice given as aforesaid, may change its
address for subsequent notices to be given hereunder.

If to Snyder:

Snyder Communications, Inc. Two Democracy Center 6903 Rockledge Drive, 15th
Floor Bethesda, Maryland  20817, Attention:  Mr. A. Clayton Perfall

If to Ventiv:

Ventiv Health, Inc. 200 Cottontail Lane Vantage Court North Somerset, New Jersey
08873, Attention:  Mr. Eran Broshy

Notice sent by U.S. mail will be deemed given when deposited with the U.S.
postal service.

                                       2
<PAGE>

16.  LIABILITY FOR NONPERFORMANCE.  Snyder shall not have any liability to
Ventiv for failure to perform its obligations hereunder unless such failure
arises out of, directly or indirectly, the willful misconduct on the part of
Snyder.  Snyder shall not be required to perform any Service (or any part of any
Service) to the extent that performance of such Service (or such part of such
Service) would violate any law, rule or regulation.  In no event shall Snyder be
liable for any Services provided or the failure to provide any Services for an
amount in excess of the compensation payable to Snyder in respect of such
Services pursuant to Section 4.1 hereof.  In no event shall any party be liable
hereunder for consequential, incidental or punitive damages.

17.  INDEPENDENT ENTITIES.  In carrying out the provisions of this agreement,
Ventiv and Snyder are and shall be deemed to be for all purposes, separate and
independent entities.  Snyder shall select its employees and agents, and such
employees and agents shall be under the exclusive and complete supervision and
control of Snyder. Snyder hereby acknowledges responsibility for full payment of
wages and other compensation to all employees and agents engaged in the
performance of its services under this agreement. It is the express intent of
this agreement that the relationship of Ventiv to Snyder and Snyder to Ventiv
shall be solely that of separate and independent companies and not that of a
joint venture, partnership or any other joint relationship.

18.  NONFIDUCIARY STATUS.  In carrying out the provisions of this agreement,
neither party shall be a fiduciary (as defined in section 3(21) of ERISA) with
respect to any employee benefit plan, program or arrangement maintained by or on
behalf of the other party. Snyder will provide services pursuant to the terms
and conditions of this agreement in accordance with the directions, guidelines
and/or procedures established by Ventiv, or the plan administrator (as defined
in section 3(16) of ERISA) of each party's employee benefit plans or
arrangements.

19. THIRD PARTY BENEFICIARIES. The provisions of this agreement are solely for
the benefit of the parties and are not intended to confer upon any person except
the parties any rights or remedies hereunder. There are no third party
beneficiaries of this agreement, and this agreement shall not provide any third
person with any remedy, claim, liability, reimbursement, action or other right
in excess of those existing prior to such date.

20.  CONSTRUCTION.  For purposes of this agreement, references to Ventiv, with
respect to events or periods prior to the distribution date, shall mean and
include, where appropriate, Snyder's healthcare services business as it existed
prior to such date.

21.  COUNTERPARTS.  This Agreement may be executed in two or more counterparts,
each of which shall be deemed an original, but all of which together shall
constitute one and the same instrument.

IN WITNESS WHEREOF, this Agreement has been executed in multiple counterparts on
the date set forth above, each of which shall, for all purposes, be deemed an
original and all of which shall evidence but one agreement between the parties
hereto.

SNYDER COMMUNICATIONS, INC.,         VENTIV HEALTH, INC.,
  a Delaware corporation               a Delaware corporation

By:                                  By:
---

 Name:                               Name:
 Title:                              Title:

                                       3

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