<PAGE>   1
                                                    BLACKED-OUT TEXT OMITTED
                                                    AND SEPARATELY FILED WITH
                                                    THE SECURITIES AND EXCHANGE
                                                    COMMISSION.

                                                                   EXHIBIT 10.1


                               ADDENDUM NO. 6 TO

                                MASTER AGREEMENT
                                      FOR
                      AIR CHARTER TRANSPORTATION SERVICES


This Addendum extends and clarifies the Agreement dated June 4, 1990, between
KITTY HAWK CHARTERS, INC. and GENERAL MOTORS CORPORATION.

Kitty Hawk and GM agree to amend their Agreement dated June 4, 1990, by
extending the term through May 31, 2000. The term of this Agreement will
continue on a monthly basis thereafter, until terminated upon not less than
thirty (30) days written notice by either party.

Kitty Hawk and GM further agree to amend their agreement as follows:
     Charter Aircraft Operator Selection, shall be clarified to include:
     Air Charter Manager is encouraged to utilize aircraft owned by Air Charter
     Manager affiliates up to a maximum of 70% of charter revenue or volume.
     Manager will advise GM prior to acquiring any additional aircraft.

This agreement is further governed by the following Exhibits which superceed
any and all previous Exhibits associated with this contract. 
Exhibit "A" - Domestic Aircraft and Accessorial Rates, effective Jenue 1, 1997
Exhibit "B" - Accessorial Charges, effective June 1, 1997 
Exhibit "C" - Rules and Definitions, effective June 1, 1997 
Exhibit "D" - Canadian Aircraft and Accessorial, effective 5-1-94.

GM will take a proactive roll in communicating Kitty Hawk charter routing
compliance to suppliers on prepaid shipments.

The parties agree the effective date of this Amendment will be the June 1, 1997


KITTY HAWK CHARTERS, INC.               GENERAL MOTORS CORPORATION



By:                                     By:  
   ----------------------------------      ----------------------------------
       Toby J. Skaar                          Joseph J. Casaroll
Title: Director Charter Operations      Title: Director Material Transportation


Date:                                   Date:
     --------------------------------        --------------------------------


<PAGE>   2
                                                    BLACKED-OUT TEXT OMITTED
                                                    AND SEPARATELY FILED WITH
                                                    THE SECURITIES AND EXCHANGE
                                                    COMMISSION.


                               AIR CHARTER TARIFF
                                                             (REVISED) Exhibit A
                                                                 Eff. 6/1/97

<TABLE>
<CAPTION>
                          MANAGED        KITTY HAWK                                              U.S.       CANADA     CREDIT
                         AIRCRAFT         AIRCRAFT         * MIN.     * MIN.      REPOSITION     GROUND     GROUND      HOUSE
AIR CRAFT TYPE         PER STAT. MI.    PER STAT. MI.        TRIP        LEG          CHARGE     CHARGE     CHARGE      TRUCK
<S>                    <C>              <C>                <C>        <C>         <C>            <C>        <C>        <C>
AZTEC                  
B-707                  
B-727-100              
B-727-200              
BANDEIRANTE            
BARON                  
BEECH 18               
BONANZA                
CARAVAN                
CASA                   
CESSNA 310             
CESSNA 402             
CESSNA 404             
CV 640 & YS-11         
CV 580                 
CV-240                 
CV-340/440             
CV-600                 
DC-3                                                        [BLACKED OUT]
DC-4 & DC-6            
DC-8 LONG              
DC-8 SHORT             
DC-9                   
ELECTRA                
FALCON 20              
HANSA JET              
JET COMM 1123          
LEAR 23 & 24           
LEAR 25                
LEAR 35                
LONG METRO             
MU-2                   
NAVAJO                 
NAVAJOD                
SENECA                 
SINGLE                 
SUPERSTAR              
TURBIN COMM            
TURBINE 18             
VOPAR BEECH            
HELICOPTERS
JET RANGER           
LONG RANGER          
BELL 222             
</TABLE>

AIRCRAFT AND HELICOPTERS NOT LISTED WILL BE BILLED ON A PASS THRU BASIS.
NO CHARGE FOR MILES IN EXCESS OF ROUND TRIP IN KITTY HAWK DC9 & CV AIRCRAFT
ALL CHARGES BY MEXICAN CARRIERS WILL BE ON PASS THRU BASIS
* WILL ONLY BE BILLED IF KITTY HAWK IS BILLED BY OPERATOR. COPY OF OPERATOR
  BILL WILL BE PROVIDED.
GROUND CHARGE INCLUDES LANDING FEE, LOAD, UNLOAD, PICKUP, AND DELIVERY.
CANADA GROUND CHARGE APPLIES TO ANY CHARTER TO or FROM CANADA
(See Exhibit D for Canadian registered aircraft rates)
6.25% WILL BE CHARGED ON DOMESTIC TRIPS TO COVER COST OF FEDERAL EXCISE TAX

<PAGE>   3
                                                           Exhibit "B" (Revised)
                                                           June 1, 1997



                        ACCESSORIAL CHARGES - PASS-THRU

          
          1.   Trip Cancellation Fees.

          2.   International Fees.

          3.   De-Icing Charges

          4.   Build-up and Break-down Charges.

          5.   Waiting Time (Loading & Unloading)


<PAGE>   4
                                                          Exhibit "C" (Revised)
                                                                   June 1, 1997

                             RULES AND DEFINITIONS

I.   GM AND KITTY HAWK APPLICATION

     A.   The Base Round Trip is defined as:      From:     The Pickup Point
                                                  To:       The Destination
                                                  To:       The Pickup Point

          Note: Mileage to multiple pickup and drop off points will be added to
          above calculation.

     B.   Cost Saver is defined as: Anything Less Than A Round Trip

     C.   Cost Saver Targets and Sharing Formula:

          Cost Savings Targets will be evaluated bi-annually based on the
          following goals and time lines.

<TABLE>
<CAPTION>
          -----------------------  ------------------  --------------------
           COST SAVINGS TARGETS:       FROM DATE:           TO DATE:
          -----------------------  ------------------  --------------------
          <S>                      <C>                 <C>
                    14%             June 1, 1997        December 31, 1997
          -----------------------  ------------------  --------------------
                                    January 1, 1998     June 30, 1998
          -----------------------  ------------------  --------------------
                    16%             July 1, 1998        December 31, 1998
          -----------------------  ------------------  --------------------
                                    January 1, 1999     June 30, 1999
          -----------------------  ------------------  --------------------
                    18%             July 1, 1999        December 31, 1999
          -----------------------  ------------------  --------------------
                                    January 1, 2000     June 30, 2000
          -----------------------  ------------------  --------------------
</TABLE>

          Cost Saver Performance is the number of GM Cost Saver trips divided
          by the total General Motor Trips.

          The Cost Savings Net Change incentive is the Cost Saving Target minus
          the Cost Saver Performance.

          The Cost Saver Sharing Formula is:

               If Net Change is a positive number, GM's cost savings percentage
               is increased from a base of 65% by 2% for each 1% Net Change.

               If Net Change is a negative number, Kitty Hawk's cost savings
               percentage is increased from a base of 35% by 1% Net Change.

          Incentive adjustments will become effective during the following
          bi-annual period. At no time will the Kitty Hawk incentive adjustment
          be greater than 45%.

          Examples:

               1.   Saving Target is 14% and Kitty Hawk's performance is 12%.
                    GM's cost savings percentage is increased from 65% to 69%
                    and Kitty Hawk's cost savings percentage is decreased from
                    35% to 31%.

               2.   Saving Target is 14% and Kitty Hawk's performance is 16%.
                    GM's cost savings percentage is decreased from 65% to 63%
                    and Kitty Hawk's cost savings percentage is increased from
                    35% to 37%.

II.  MULTIPLE CUSTOMER APPLICATION

     A.   Ferry Miles:        Will be prorated to each plant based on the
                              loaded miles flown.

     B.   Aircraft Sharing:   Plants will share equally in cost when sharing
                              the same aircraft.

     NOTE: If aircraft size requirements are different, the plant requiring the
     less expensive aircraft will be allocated cost based on one way miles of
     the smaller plane. The plant requiring the larger aircraft will be
     allocated the balance of the cost.
<PAGE>   5
                                                    BLACKED-OUT TEXT OMITTED
                                                    AND SEPARATELY FILED WITH
                                                    THE SECURITIES AND EXCHANGE
                                                    COMMISSION.


                                                            EXHIBIT D (Revised)
                                                              Effective: 5/1/94

<TABLE>
<CAPTION>
                      COST
                      PER                                    CREDIT
                     STATUTE       MIN     MIN     GROUND   IN-HOUSE
AIRCRAFT TYPE         MILE         TRIP    LEG     CHARGE    TRUCK
-------------        -------       ----    ---     ------   --------
<S>                  <C>           <C>     <C>     <C>      <C>
AZTEC                  
BANDEIRANTE            
BARON                  
BEECH 100               
BEECH 18               
CARAVAN                
CASA                   
CESSNA 310             
CESSNA 402             
CESSNA 404             
CESSNA CITATION        
CV-240/340/440             
CV 580/600/640                       [BLACKED-OUT]
DC-3                   
DC-4 & DC-6            
FALCON 10              
FALCON 20              
LEAR 23 & 24           
LEAR 25                
LEAR 35                
METROLINER             
MU-2                   
NAVAJO                 
SMALL SINGLE                 
TURBINE 18             

LARGE AIRCRAFT:
DC-8, DC-9, 707
727, C130, L188
</TABLE>

ALL OTHER AIRCRAFT AND HELICOPTERS WILL BE BILLED ON A PASS THRU BASIS.

     *    Will only be billed if Kitty Hawk is billed by Operator, copy of
          Operator bill will be provided.

     **   Ground Charge includes Landing Fee, Load, Unload, Pickup, and
          Delivery Charges.

          VCC Charges will be billed monthly as Pass-Thru charges.

          Canadian GST tax billed as Pass Thru charge when applicable.