Document:

<PAGE>

                                                                   Exhibit 10.18

                                    CONSENT

     THIS CONSENT (this "Consent"), dated as of October 5, 2001, to the Credit
                         -------
Agreement referenced below, is by and among Navigant International, Inc., a
Delaware corporation (the "Borrower"), the Subsidiaries of the Borrower
                           --------
identified on the signature pages hereto (the "Guarantors"), the Lenders
                                               ----------
identified on the signature pages hereto and Bank of America, N.A., as
Administrative Agent.  Terms used herein but not otherwise defined herein shall
have the meanings provided to such terms in the Credit Agreement.

                              W I T N E S S E T H

     WHEREAS, a $150 million credit facility has been extended to the Borrower
pursuant to the terms of that Amended and Restated Credit Agreement (as amended
and modified from time to time, the "Credit Agreement") dated as of August 6,
                                     ----------------
1999 among the Borrower, the Guarantors, the Lenders, U.S. Bank National
Association, as Syndication Agent, KeyBank National Association, as
Documentation Agent, and Bank of America, N.A., as Administrative Agent;

     WHEREAS, the Borrower has requested a consent under the Credit Agreement;
and

     WHEREAS, the Required Lenders have agreed to the requested consent on the
terms and conditions set forth herein.

     NOW, THEREFORE, IN CONSIDERATION of the premises and other good and
valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, the parties hereto agree as follows:

     1.   Consent of the Required Lenders.
          -------------------------------

     (a)  Section 7.9(a). Section 7.9(a) of the Credit Agreement provides that
          --------------
the Consolidated Leverage Ratio as of the end of each fiscal quarter shall not
be greater than 2.50:1.0. The Required Lenders hereby consent and agree that,
notwithstanding Section 7.9(a) of the Credit Agreement, (a) the Consolidated
Leverage Ratio as of the end of the fiscal quarter ending September 30, 2001
shall not be greater than 3.75:1.0 and (b) no Default or Event of Default shall
occur under Section 7.9(a) for the fiscal quarter ending September 30, 2001
unless the Consolidated Leverage Ratio as of the end of such quarter is greater
than 3.75:1.0.

     (b)  Section 7.9(e).  Section 7.9(e) of the Credit Agreement provides that
          --------------
the ratio of Consolidated Debt (as defined in the Note Purchase Agreement on the
Third Amendment Date) to Consolidated EBITDA (as defined in the Note Purchase
Agreement on the Third Amendment Date) as of the end of each fiscal quarter
shall not be greater than 2.75:1.0.  The Required Lenders hereby consent and
agree that, notwithstanding Section 7.9(e) of the Credit Agreement, (a) the
ratio of Consolidated Debt (as defined in the Note Purchase Agreement on the
Third Amendment Date) to Consolidated EBITDA (as defined in the Note Purchase
Agreement on the Third Amendment Date) shall not be greater than 3.75:1.0 and
(b) no Default or Event of Default shall occur under Section 7.9(e) for the
fiscal quarter ending September 30, 2001 unless the ratio of Consolidated Debt
(as defined in the Note Purchase Agreement on the Third Amendment Date) to
Consolidated EBITDA (as defined in the Note Purchase Agreement on the Third
Amendment Date) as of the end of such quarter is greater than 3.75:1.0.

     2.   Covenants of the Borrower.  In consideration of the consent of the
          -------------------------
Required Lenders set forth above, the Borrower hereby covenants and agrees that,
notwithstanding Section 8.4(c) and Section 8.10 of the Credit Agreement, the
Borrower will not at any time prior to January 1, 2002 (a) make any cash
payments (including, without limitation, the proceeds of any Loans) to acquire
all or any portion of
<PAGE>

the capital stock or other ownership interest in, or all or any substantial
portion of the assets, property and/or operations of, any Person (except cash
payments made to satisfy earn-out obligations to the extent funded exclusively
from the revenues of the acquired Person or from assets or operations acquired
from a Person shall not be prohibited hereunder) or (b) make or permit any cash
payments (including, without limitation, the proceeds of any Loans) to
repurchase any Capital Stock of the Borrower.

     3.  Conditions Precedent.  This Consent shall be effective as of the date
         --------------------
set forth above upon receipt by the Administrative Agent of multiple
counterparts of this Consent executed by the Borrower, the Guarantors and the
Required Lenders.

     4.  Reaffirmation of Representations and Warranties.  The Borrower hereby
         -----------------------------------------------
affirms that the representations and warranties set forth in the Credit
Agreement and the other Credit Documents are true and correct as of the date
hereof (except those which expressly relate to an earlier period).

     5.  Reaffirmation of Guaranty. Each Guarantor (i) acknowledges and consents
         -------------------------
to all of the terms and conditions of this Consent, (ii) affirms all of its
obligations under the Credit Documents and (iii) agrees that this Consent and
all documents executed in connection herewith do not operate to reduce or
discharge such Guarantor's obligations under the Credit Agreement or the other
Credit Documents.

     6.  No Other Changes.  Except as modified hereby, all of the terms and
         ----------------
provisions of the Credit Agreement and the other Credit Documents (including
schedules and exhibits thereto) shall remain in full force and effect.

     7.  Counterparts. This Consent may be executed in any number of
         ------------
counterparts, each of which when so executed and delivered shall be deemed an
original and it shall not be necessary in making proof of this Consent to
produce or account for more than one such counterpart.

     8.  Governing Law. This Consent shall be deemed to be a contract made
         -------------
under, and for all purposes shall be construed in accordance with, the laws of
the State of North Carolina.

                 [Remainder of Page Intentionally Left Blank]

                                       2
<PAGE>

     IN WITNESS WHEREOF, each of the parties hereto has caused a counterpart of
this Consent to be duly executed and delivered as of the date first above
written.

BORROWER:                               NAVIGANT INTERNATIONAL, INC.,
--------                                a Delaware corporation

                                        By:_________________________
                                        Name:  Eugene A. Over, Jr.
                                        Title: Vice President

GUARANTORS:                             AKRA TRAVEL, INC.,
----------                              a Florida corporation
                                        ARRINGTON TRAVEL CENTER, INC.,
                                        an Illinois corporation
                                        ASSOCIATED TRAVEL SERVICES, LLC,
                                        a Delaware limited liability company
                                        BOWERS WORLDWIDE TRAVEL SERVICES, INC.,
                                        an Arizona corporation
                                        COUCH/MOLLICA TRAVEL, LTD.,
                                        a Pennsylvania corporation
                                        CORNERSTONE ENTERPRISES, INC.,
                                        a Massachusetts corporation
                                        DAWSON'S TRAVEL, INC.,
                                        a California corporation
                                        DOLLINGER TRAVEL, INC.,
                                        a New York corporation
                                        ENVISION VACATIONS, INC.,
                                        a Michigan corporation
                                        EVANS TRAVEL GROUP, INC.,
                                        a Louisiana corporation
                                        EVANS VACATIONS, INC.,
                                        a Delaware corporation
                                        FIRST TRAVELCORP, INC.,
                                        a North Carolina corporation
                                        FORBES TRAVEL SERVICE, INC.,
                                        a Pennsylvania corporation
                                        INTERNATIONAL TRAVEL RESOURCES, INC.,
                                        a Georgia corporation
                                        LOVEJOY-TIFFANY & ASSOCIATES, INC.,
                                        a Michigan corporation

                                        By: _________________________
                                        Name:  Eugene A. Over, Jr.
                                        Title: Vice President of each
                                               of the foregoing Guarantors

                          [Signature Pages Continue]
<PAGE>

                            MCGREGOR TRAVEL MANAGEMENT, INC.,
                            a Connecticut corporation
                            MORAN TRAVEL BUREAU, INC.,
                            a Massachusetts corporation
                            MTA, INC.,
                            a Washington corporation
                            NAVIGANT INTERNATIONAL U.K. HOLDINGS, INC.
                            a Delaware corporation
                            NAVIGANT CRUISE CENTER, INC.,
                            a Delaware corporation
                            PROFESSIONAL TRAVEL CORPORATION,
                            a Colorado corporation
                            SIMMONS ASSOCIATES, INC.,
                            a Virginia corporation
                            TRAVEL CONSULTANTS, INC.,
                            a Michigan corporation
                            TRAVELCORP., INC.,
                            a Minnesota corporation
                            WORLD EXPRESS TRAVEL, INC.,
                            an Alaska corporation

                            By:_________________________
                            Name:  Eugene A. Over, Jr.
                            Title: Vice President of each
                                   of the foregoing Guarantors

                            ATLAS TRAVEL SERVICES, LP,
                            a Texas limited partnership

                            By:    ATLAS TRAVEL GP, INC.,
                                   a Texas corporation

                                   By:________________________________
                                   Name:  Eugene A. Over, Jr.
                                   Title: Vice President

                          [Signature Pages Continue]
<PAGE>

LENDERS:                      BANK OF AMERICA, N.A.,
-------                       in its capacity as Administrative Agent
                              and in its individual capacity as a Lender

                              By: _________________________
                              Name:
                              Title:

                              U.S. BANK NATIONAL ASSOCIATION

                              By: _________________________
                              Name:
                              Title:

                              KEYBANK, N.A.

                              By: _________________________
                              Name:
                              Title:

                              THE BANK OF NOVA SCOTIA

                              By: _________________________
                              Name:
                              Title:

                              BANK ONE, COLORADO, N.A.

                              By: _________________________
                              Name:
                              Title:

                              UNION BANK OF CALIFORNIA

                              By: _________________________
                              Name:
                              Title:<PAGE>

                                                                   Exhibit 10.19

                               October 10, 2001

Navigant International, Inc.
     84 Inverness Circle East
     Englewood, CO 80112
     Attention:  General Counsel

     Re:  Amendment to Note Purchase Agreements

Ladies and Gentlemen:

     Reference is made to (1) the Note Purchase Agreement, dated as of November
15, 2000, by and between Navigant International, Inc., a Delaware corporation
(the "Company"), and The Prudential Insurance Company of America, (2) the Note
Purchase Agreement, dated as of November 15, 2000, by and between the Company,
on the one hand, and Security Life of Denver Insurance Company, USG Annuity &
Life Company, Northern Life Insurance Company, Reliastar Life Insurance Company,
Reliastar Life Insurance Company of New York and Security Connecticut Life
Insurance Company, on the other hand, (3) the Note Purchase Agreement, dated as
of November 15, 2000, by and between the Company and Teachers Insurance and
Annuity Association of America, (4) the Note Purchase Agreement, dated as of
November 15, 2000, by and between the Company and The Guardian Life Insurance
Company of America, and (5) the Note Purchase Agreement, dated as of November
15, 2000, by and between the Company and Hartford Life Insurance Company (each a
"Note Purchase Agreement"; collectively, the "Note Purchase Agreements").
Capitalized terms not defined herein shall have the meanings given to such terms
in the Note Purchase Agreements.

     Pursuant to the request of the Company and the provisions of Section 17.1
of the Note Purchase Agreements, each of the undersigned agrees to amend the
respective Note Purchase Agreement to which it is a party, subject to the
conditions and in reliance on the representations and warranties set forth
herein.

     In consideration of the foregoing recitals, the parties hereto agree as
follows:

     1.   Amendments to Note Purchase Agreements.

          1.1  Section 10.5 of each Note Purchase Agreement is amended by
inserting the following proviso at the end thereof:

          "; provided, however, that solely during such period of time
          Consolidated EBITDA for the period of four fiscal quarters ended
          September 30, 2001 is
<PAGE>

Navigant International, Inc.
October 10, 2001
Page Two

          relevant, the Company may permit such ratio to be in excess of
          2.75:1.00 but not greater than 3.75:1.00."

          1.2    The following is added to each Note Purchase Agreement as a new
Section 9.10 thereof:

          "9.10  Minimum Commitment.

          The Company shall at all times have in place a committed revolving
          credit facility from banks and other financial institutions with
          aggregate availability of not less than $150,000,000, and such
          facility shall not expire until such time as each holder of the Notes
          has received (i) financial statements of the Company and its
          subsidiaries for the fiscal year ended December 31, 2001 (which may be
          in the form of internally-prepared financial statements) and (ii) a
          certificate ("Certificate") from the Company's chief financial officer
          certifying to the effect that such financial statements fairly present
          in all material respects the consolidated financial position of the
          Company and its Restricted Subsidiaries as of December 31, 2001 and
          that no Default or Event of Default existed on December 31, 2001 or
          exists as of the date of the Certificate, unless such Default or Event
          of Default has been consented to or waived."

          1.3    The following is added to each Note Purchase Agreement as a new
Section 10.14 thereof:

          "10.14 Minimum Bank Commitment.

          The Company will not allow the principal amount of Indebtedness of the
          Company under the Bank Credit Agreement to be less than $100,000,000
          until such time as each holder of the Notes has received (i) financial
          statements of the Company and its subsidiaries for the fiscal year
          ended December 31, 2001 (which may be in the form of internally-
          prepared financial statements) and (ii) the Certificate."

          1.4    The following definition is added to the list of definitions
set forth on Schedule B of each Note Purchase Agreement, inserted in its
respective alphabetical sequence:

          "Certificate" shall have the meaning assigned to such term in Section
9.10.

     2.   Condition to Effectiveness. The effectiveness of the foregoing
amendments is subject to the receipt by each of the undersigned of an amendment
to the Bank Credit Agreement, in the form of Exhibit A attached hereto ("Bank
Amendment"), duly executed and
<PAGE>

Navigant International, Inc.
October 10, 2001
Page Three

delivered by each lender under the Bank Credit Agreement and Bank of America, as
agent thereunder (collectively, the "Bank Group").

     3.   Representations and Warranties.  The Company hereby certifies that (a)
no Default or Event of Default under any Note Purchase Agreement will exist upon
giving effect to this letter amendment and the Bank Amendment, and (b) the Bank
Group is not receiving any remuneration for the Bank Amendment.

     4.   Covenants of the Company.  In consideration of the consent set forth
above, the Company hereby covenants and agrees that, notwithstanding Section
10.9, Section 10.11, and  Section 10.12 of, or any other provision to the
contrary in, the Note Purchase Agreements or the other Transaction Documents,
the Company will not at any time prior to the time each holder of the Notes has
received the Certificate (a) make any cash payments to acquire all or any
portion of the capital stock or other ownership interest in, or all or any
substantial portion of the assets, property and/or operations of, any Person
(except cash payments made to satisfy earn-out obligations to the extent
exclusively funded from the revenues of the acquired Person or from assets or
operations acquired from a Person shall not be prohibited hereunder) or (b) make
or permit any cash payments to repurchase or redeem any capital stock of the
Company, or (c) declare or pay any cash dividend or make any other cash
distribution on any of its capital stock now outstanding or hereafter issued.

     5.   No Waiver. The amendments and agreements set forth in this letter
amendment shall be limited precisely as written and shall not be deemed to be
(a) an amendment, consent or waiver of any other terms or conditions of any Note
Purchase Agreement or any other Transaction Document, (b) a waiver of any right
or remedy of the holders of the Notes pursuant to the Transaction Documents or
(c) a consent to any future amendment, consent or waiver of any provision of the
Note Purchase Agreements or any other Transaction Document. Except as expressly
set forth in this letter amendment, each Note Purchase Agreement and all related
documents shall continue in full force and effect.

     6.   Counterparts; Effectiveness.  This letter amendment may be executed in
any number of counterparts and by different parties hereto in separate
counterparts, each of which when so executed and delivered shall be deemed an
original, but all of which counterparts together shall constitute but one and
the same instrument.
<PAGE>

Navigant International, Inc.
October 10, 2001
Page Four

                              Very truly yours,

                              The Prudential Insurance Company of America

                              By:__________________________________
                              Name:________________________________
                              Title:_____________________________________

                              Security Life Of Denver Insurance Company
                              USG Annuity & Life Company
                              Northern Life Insurance Company
                              Reliastar Life Insurance Company
                              Reliastar Life Insurance Company Of New York
                              Security Connecticut Life Insurance Company
                              By:  ING Investment Management LLC,
                                   as Agent of each of the foregoing

                              By:__________________________________
                              Name:________________________________
                              Title:_______________________________

                              Teachers Insurance and Annuity Association of
                              America

                              By:______________________________________
                              Name:____________________________________
                              Title:___________________________________

                              The Guardian Life Insurance Company of America

                              By:______________________________________
                              Name:____________________________________
                              Title:___________________________________
<PAGE>

Navigant International, Inc.
October 10, 2001
Page Five

                                           Hartford Life Insurance Company

                                           By:_________________________________
                                           Name:_______________________________
                                           Title:______________________________

The foregoing is hereby accepted and agreed to
as of the date first above written.

Navigant International, Inc.

By:____________________________________
Name:__________________________________
Title:_________________________________

The undersigned Guarantors consent to the foregoing.

          AKRA TRAVEL, INC.,
          a Florida corporation
          ARRINGTON TRAVEL CENTER, INCORPORATED,
          an Illinois corporation
          ASSOCIATED TRAVEL SERVICES, LLC,
          a Delaware limited liability company
          BOWERS WORLDWIDE TRAVEL SERVICE, INCORPORATED,
          an Arizona corporation
          COUCH/MOLLICA TRAVEL, LTD.,
          a Pennsylvania corporation
          CORNERSTONE ENTERPRISES, INC.,
          a Massachusetts corporation
          ENVISION VACATIONS, INC.,
          a Michigan corporation
          EVANS TRAVEL GROUP, INC.,
          a Louisiana corporation

          By: _______________________________
          Name:   Eugene A. Over, Jr.
          Title:  Vice President of each
                  of the foregoing Guarantors
<PAGE>

Navigant International, Inc.
October 10, 2001
Page Six

               FIRST TRAVELCORP, INC.,
               a North Carolina corporation
               FORBES TRAVEL SERVICE, INC.,
               a Pennsylvania corporation
               MCGREGOR TRAVEL MANAGEMENT, INC.,
               a Connecticut corporation
               MORAN TRAVEL BUREAU, INC.,
               a Massachusetts corporation
               MTA, INC.,
               a Washington corporation
               NAVIGANT INTERNATIONAL UK HOLDINGS, INC.
               a Delaware corporation
               NAVIGANT CRUISE CENTER, INC.,
               a Delaware corporation
               PROFESSIONAL TRAVEL CORPORATION,
               a Colorado corporation
               SIMMONS ASSOCIATES, INC.,
               a Virginia corporation
               TRAVEL CONSULTANTS, INC.,
               a Michigan corporation
               TRAVELCORP, INC.,
               a Minnesota corporation
               MUTUAL TRAVEL, INC.,
               a Washington corporation

               By: ______________________________
               Name:  Eugene A. Over, Jr.
               Title: Vice President of each
                      of the foregoing Guarantors

               ATLAS TRAVEL SERVICES, L.P.,
               a Texas limited partnership

               By:    ATLAS TRAVEL GP, INC.,
                      a Texas corporation

                      By:________________________________
                      Name:   Eugene A. Over, Jr.
                      Title:  Vice President

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00035-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00035-of-00352.parquet"}]]