- C.A.L.M. Systems, Inc.
 - Northbrook - Software for aviation maintenance and inventory control, bar coding, EDI, and document management. - Dave Dacy Airshows
- Harvard - Providing air performers, announcers, airboss/ground operations, sound systems, and air show planning.
- EAD Aerospace, Inc.
- Oakbrook Terrace - Consulting and engineering firm specialising in avionics retrofits and transport aviation.
- Eckhart Helicopter Sales
- Grayslake - Helicopter sales and brokerage services for commercial aircraft including Eurocopter, Bell, Sikorsky, Aerospatiale, and MD Helicopters.
- Flight Center, The
- Wheeling - Lessons, aircraft rentals, pilot certificates, scenic flights and more.
- G & N Aircraft, Inc
- Griffith - Custom engine overhaul and repair for Lycoming and Continental aircraft piston engines and engine accessories.
- General Aviation Services, Inc.@
- Lake Zurich
- J. A. Air Center
- West Chicago - Services include instrument sales, service and installation, airframe and engine maintenance, and aircraft sales.
- J.A. Aero, Inc.
- West Chicago - J.A. Aero is an international provider of aeroplanes for sale. All makes and models available.
- Kay and Associates, Inc.
- Arlington Heights - Technical services to government and industrial customers worldwide
- North American Jet
- Chicago - Provides maintenance services, aircraft management and sales, charter bookings, and more.
- Perry Aviation Refuelers
- East Chicago - Tanker trucks and pumps used with aviation fuels (jet fuel and avgas) to refuel aircraft at airport FBO.
- Pilot Shop, The
- West Chicago - Offers pilot supplies and aircraft accessories.
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