CUSTOMER SUPPORT VARIABLES

                                     between

                               THE BOEING COMPANY

                                       and

                            American Trans Air, Inc.


           Supplemental Exhibit CS1 to Purchase Agreement Number 2262




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                           CUSTOMER SUPPORT VARIABLES

                                   relating to

                          BOEING MODEL 737-83N AIRCRAFT


Customer and Boeing will conduct  planning  conferences  approximately 12 months
before delivery of the first Aircraft,  or as otherwise  agreed,  to develop and
schedule a  customized  Customer  Support  Program to be  furnished by Boeing in
support of the Aircraft.

The customized  Customer  Services  Program will be based upon and equivalent to
the entitlements summarized below.


1.       MAINTENANCE TRAINING.
         --------------------

     1.1 Airplane General Familiarization Course; 1 class of 24 students;

     1.2 Mechanical/Power Plant Systems Course; 2 classes of 15 students;

     1.3 Electrical Systems Course; 2 classes of 15 students;

     1.4 Avionics Systems Course; 2 classes of 15 students;

     1.5 Corrosion Prevention & Control Course; 1 class of 10 students;

     1.6 Aircraft Rigging Course; 1 class of 6 students;

     1.7 Composite Repair for Technicians - Basic; 1 class of 8 students;

     1.8 Training materials will be provided to each student.  In addition,  one
set of training  materials used in Boeing's training  program,  including visual
aids,  Computer  Based  Training  Courseware,   instrument  panel  wall  charts,
text/graphics,  video programs,  etc. will be provided for use in Customer's own
training program.



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2.       FLIGHT TRAINING.
         ---------------

     2.1  Transition  training for 8 flight crews (16 pilots) in 2 classes;  The
training  will consist of ground school  (utilizing  computer  based  training),
fixed base  simulator,  full flight  simulator and actual  aircraft  training on
Customer's Aircraft.

     2.2 Flight Dispatcher training; 2 classes of 6 students;

     2.3 Flight Attendant training; 2 classes of 12 students;

     2.4 Performance  Engineer training in Boeing's regularly scheduled courses;
schedules are published twice yearly.

     2.5 Training materials will be provided to each student.  In addition,  one
set of training materials as used in Boeing's training program, including visual
aids,  Computer  Based  Training  Courseware,   instrument  panel  wall  charts,
text/graphics,  video programs,  Flight Attendant Manuals, etc. will be provided
for use in Customer's own training program.

     2.6 Additional Flight Operations Services:

     a. Boeing flight crew personnel to assist in ferrying the first aircraft to
Customer's main base;

     b.  Instructor  pilots for 90 calendar  days for revenue  service  training
assistance;

     c. An instructor  pilot to visit  Customer 6 months after  revenue  service
training to review Customer's flight crew operations for a 2 week period.



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3.       PLANNING ASSISTANCE.
         -------------------

         3.1      MAINTENANCE AND GROUND OPERATIONS.
                  ---------------------------------

                  Upon  request,  Boeing  will  visit  Customer's  main  base to
                  evaluate    aircraft    maintenance    facilities,     develop
                  recommendations and assist in maintenance planning.

         3.2      SPARES.
                  ------

                  a)       RECOMMENDED SPARES PARTS LIST (RSPL)
                           ------------------------------------
                           customized  RSPL, data and documents will be provided
                           to  identify  spare  parts  required  for  Customer's
                           support program.

                  b)       ILLUSTRATED PARTS CATALOG (IPC)
                           -------------------------------
                           A customized  IPC in accordance  with ATA 100 will be
provided.

                  c)       PROVISIONING TRAINING
                           Provisioning training will be provided for Customer's
                           personnel at Boeing's facilities, where documentation
                           and technical  expertise are  available.  Training is
                           focused  on  the  initial  provisioning  process  and
                           calculations reflected in the Boeing RSPL.

                  d)       SPARES PROVISIONING CONFERENCE
                           A provisioning conference will be conducted, normally
                           at  Boeing's  facilities  where  technical  data  and
                           personnel are available.

4:       TECHNICAL DATA AND DOCUMENTS

         4.1.     FLIGHT OPERATIONS.
                  -----------------
                  Airplane Flight Manual
                  Operations Manual
                  Quick Reference Handbook
                  Weight and Balance Manual
                  Dispatch Deviation Procedures Guide
                  Flight Crew Training Manual
                  Performance Engineer's Manual
                  Jet Transport Performance Methods
                  FMC Supplemental Data Document
                  Operational Performance Software
                  Fault Reporting Manual
                  ETOPS Guide Vol. III
                  Flight Planning and Performance Manual


         4.2.     MAINTENANCE.
                  -----------
                  Aircraft Maintenance Manual
                  Wiring Diagram Manual
                  Systems Schematics Manual
                  Connector Part Number Options Document
                  Structural Repair Manual
                  Overhaul/Component Maintenance Manual
                  Standard Overhaul Practices Manual
                  Standard Wiring Practices Manual
                  Non-Destructive Test Manual
                  Service Bulletins and Index
                  Corrosion Prevention Manual
                  Fault Isolation Manual
                  Fuel Measuring Stick Calibration  Document Power Plant Buildup
                  Manual Central Maintenance  Computer System Reporting Table In
                  Service  Activity Report All Operator  Letters Service Letters
                  Structural  Item Interim  Advisory  Maintenance  Tips Combined
                  Index

     4.3. MAINTENANCE PLANNING.  --------------------  Maintenance Planning Data
Document Maintenance  Planning Data Tasks Masterfile  Maintenance Task Cards and
Index Maintenance  Inspection Intervals Report ETOPS Guide Vol. II Configuration
Maintenance and Procedures for Extended Range Operations

         4.4.     SPARES.
                  ------
                  Illustrated Parts Catalog
                  Standards Books

         4.5.     FACILITIES AND EQUIPMENT PLANNING.
                  ---------------------------------
                  Facilities and Equipment Planning Document
                  Special Tool and Ground Handling Equipment Drawings and Index
                  Supplementary Tooling Documentation
                  Illustrated Tool and Equipment List/Manual
                  Aircraft Recovery Document
                  Airplane Characteristics for Airport Planning Document
                  Airplane Rescue and Fire Fighting Document
                  Engine Handling Document
                  ETOPS Guide Vol. I

         4.6.     SUPPLIER TECHNICAL DATA.
                  -----------------------
                  Service Bulletins
                  Ground Support Equipment Data
                  Provisioning Information
                  Component Maintenance/Overhaul Manuals and Index
                  Publications Index
                  Product Support Supplier Directory