- AAA Air Support
 - Gardena - Distributor of roll form aluminium stringers, extrusions and seat track for commercial aircraft. - AirFlite Aviation Services
- Long Beach - Fixed base operation located at the Long Beach Airport; providing aircraft sales, leasing, and management services.
- Airo Industries
- San Fernando - Offers aircraft interior reconfiguration, crew and passenger seat refurbishment, overhaul and repair of galley, food carts, and more.
- Airport Group International
- Glendale - Provides support services for airports and airlines, including plane fueling, baggage systems, security systems, cargo handling, mail sortation, and more.
- Avjet Corporation
- Burbank - Offering jet sales, charter, leasing, management, and maintenance services worldwide.
- Castle Precision Industries
- Sylmar - Manufacturing aircraft landing gear and components.
- Chrysler Aviation Inc.
- Van Nuys - Jet charters to any destination; also, pilot training and aircraft leasing.
- Clay Lacy Aviation
- Van Nuys - Executive jet aircraft charter, turbine aircraft maintenance, aerial cinematography, executive terminal, air ambulance, and aircraft sales.
- Consolidators International Inc. CII
- Wholesale airfreight to new zealand, Australia and the U.K.
- Desser Tire & Rubber Co.
- Montebello - Distributes aircraft tyres.
- Electronic Material Industries
- Toluca Lake - Independent stocking distributor of military spec electronic components for the aviation industry.
- Fortner Accessory Service Corporation (FAS)
- Glendale - FAA approved repair station specialising in the overhaul/repair of Bell Helicopter Hydraulic Flight Control assemblies and detail components.
- Gold Country Aviation
- Lancaster - Aircraft sales, repair, modification, specialising in Grumman-American Tigers & Cheetahs.
- Group3 Inc
- Van Nuys - Helicopter and aeroplane flight training for local and international students, and rentals, photography, and scenic tours.
- Gyrodyne-California
- Original equipment manufacturer of the QH-50 series of vertical takeoff unmanned aerial vehicles.
- HeliClass
- Valencia - Helicopter training, sightseeing tours, and charters.
- Hit the Silk, LLC
- Canoga Park - Sells ejection seats and escape systems for sport aerobatic plane crews.
- IFR Avionics
- Van Nuys - Avionics engineering, installation and service centre, servicing corporate aircraft and helicopters in Van Nuys.
- Mercury GSE
- El Segundo - Supplies aircraft ground support equipment worldwide.
- Nasco Aircraft Brakes
- Gardena - Second-source manufacturer of commercial and military aircraft brake components.
- Pacific Oil Cooler Service
- South El Monte - Full line of aircraft oil coolers in stock. Buy, sell, repair, overhaul and exchange all types.
- Richmond Aircraft Products
- Norwalk - Offers vacuum processing materials, bagging and release films and fabrics, pressure sensitive and sealant tapes, structural foams, and vacuum valves and hoses for the aerospace, composite, and metal bonding industries.
- Robinson Helicopter Company
- Torrance - Manufacturer of the R22 and R44, also offers helicopter maintenance and repair.
- Summit Aviation
- Van Nuys - Air ambulance and executive charter services.
- Teledyne Controls
- Supplier of avionics equipment and services in areas of aircraft, helicopter, and airport systems.
- The Air Group, Inc.
- Provides turnkey aircraft management, sales and acquisition, charter management, and repair capabilities.
- Thornton Aircraft Company
- Van Nuys - Turbine aircraft maintenance and overhaul, television/motion picture flight services, military jet sales, flight training, and parts support.
- U.S. Chrome Corporation
- Long Beach - FAA/JAA Repair Station ZY3R041M specialising in aircraft hydraulic and pneumatic component repairs.
- Vertical Aeronautics
- Van Nuys - Leading heliport company offering consulting, safety inspection, landing pads, management, and government spec jobs.
- Worldwide Aeros
- Chatsworth - Builds and sells aerostats, blimps, and airships.
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