- Robinson Helicopter Company
 - Torrance - Manufacturer of the R22 and R44, also offers helicopter maintenance and repair. - Desser Tire & Rubber Co.
- Montebello - Distributes aircraft tyres.
- Aviation World Services
- Westlake Village - Offering aircraft sales, leasing, and consulting.
- Group3 Inc
- Van Nuys - Helicopter and aeroplane flight training for local and international students, and rentals, photography, and scenic tours.
- PilotAge
- Costa Mesa - Trade magazine for Southern California aviators.
- Pacific Consolidated Industries
- Santa Ana - Specialises in portable oxygen- and nitrogen-generating plants and related accessory equipment.
- HeliClass
- Valencia - Helicopter training, sightseeing tours, and charters.
- Clay Lacy Aviation
- Van Nuys - Executive jet aircraft charter, turbine aircraft maintenance, aerial cinematography, executive terminal, air ambulance, and aircraft sales.
- Christiecbs.com
- Lake Forest - Distributes Christie aircraft battery maintenance automation products, including chargers, analyzers, battery and cell monitoring instruments, and a Windows-based battery maintenance controller.
- Bill Cornick - Professional Aerobatics
- Thousand Oaks - Precision airshow performances in his Pitts S-2C.
- Nasco Aircraft Brakes
- Gardena - Second-source manufacturer of commercial and military aircraft brake components.
- Worldwide Aeros
- Chatsworth - Builds and sells aerostats, blimps, and airships.
- The Air Group, Inc.
- Los Angeles - Provides turnkey aircraft management, sales and acquisition, charter management, and repair capabilities.
- Ken Brock Manufacturing
- Stanton - Manufacturing gyroplane pre-fabricated sub-kits, and home-built aircraft components.
- Pacific Electronic Enterprises
- Huntington Beach - Providing repair of military avionic systems, radar, communication and microwave.
- Sunrise Aviation
- Santa Ana - Offering complete pilot training, aerobatics instruction, and aircraft rentals for both U.S. and foreign students.
- Teledyne Controls
- Los Angeles - Supplier of avionics equipment and services in areas of aircraft, helicopter, and airport systems.
- Consolidators International Inc. CII
- Los Angeles - Wholesale airfreight to new zealand, Australia and the U.K.
- Pacific Oil Cooler Service
- South El Monte - Full line of aircraft oil coolers in stock. Buy, sell, repair, overhaul and exchange all types.
- Avjet Corporation
- Burbank - Offering jet sales, charter, leasing, management, and maintenance services worldwide.
- Gyrodyne-California
- Los Angeles - Original equipment manufacturer of the QH-50 series of vertical takeoff unmanned aerial vehicles.
- Mercury GSE
- El Segundo - Supplies aircraft ground support equipment worldwide.
- Orange County Flight Center
- Santa Ana - Includes flight training, ground school, and rentals.
- IFR Avionics
- Van Nuys - Avionics engineering, installation and service centre, servicing corporate aircraft and helicopters in Van Nuys.
- Gold Country Aviation
- Lancaster - Aircraft sales, repair, modification, specialising in Grumman-American Tigers & Cheetahs.
- 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.
- US Technical Corporation
- Anaheim - Provides a turn-key aviation products, engineering and FAA/JAA certification service to airlines, aircraft manufacturers and equipment OEM.
- AirFlite Aviation Services
- Long Beach - Fixed base operation located at the Long Beach Airport; providing aircraft sales, leasing, and management services.
- Sight, Sound, & Motion
- Thousand Oaks - Produces professional flight simulation-visualisation software which simulates any flight vehicle with 6-DOF motion and full-system modelling.
- Chrysler Aviation Inc.
- Van Nuys - Jet charters to any destination; also, pilot training and aircraft leasing.
- Cal-Aero Parts & Service
- Simi Valley - For Piper, Cessna, Beechcraft, and more.
- AAA Air Support
- Gardena - Distributor of roll form aluminium stringers, extrusions and seat track for commercial aircraft.
- J.C. Carter Company
- Costa Mesa - Designs and manufactures aircraft fuel system components, ground fueling equipment and marine industrial pumps.
- Air & Space Rides and Adventures - Air Combat USA
- Fullerton - Fly real combat aircraft in air combat missions.
- DABICO, Inc.
- Costa Mesa - Specialised in aircraft ground support equipment(GSE).
- 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.
- U.S. Chrome Corporation
- Long Beach - FAA/JAA Repair Station ZY3R041M specialising in aircraft hydraulic and pneumatic component repairs.
- Wing Waxers
- Big Bear City - Aircraft detailing and polishing nationwide.
- Vertical Aeronautics
- Van Nuys - Leading heliport company offering consulting, safety inspection, landing pads, management, and government spec jobs.
- Dupree, Inc.
- Chino - Offers illuminated cockpit accessories, control panel knobs, and fasteners for commercial and military aircraft.
- Ocean Air
- Yorba Linda - Supplier of commercial aircraft products for the aviation aftermarket. Specialises in airborne communication, navigation, and instrumentation systems.
- Thornton Aircraft Company
- Van Nuys - Turbine aircraft maintenance and overhaul, television/motion picture flight services, military jet sales, flight training, and parts support.
- Mountain Hawk Aviation
- Tehachapi - Offering aircraft rental, flight instruction, maintenance, and more.
- Aviation Distributors (ADI)
- Lake Forest - Aircraft parts redistributor and inventory management service provider.
- Redhill Aviation
- Costa Mesa - Offering aircraft parts and pilot supplies.
- Airo Industries
- San Fernando - Offers aircraft interior reconfiguration, crew and passenger seat refurbishment, overhaul and repair of galley, food carts, and more.
- Summit Aviation
- Van Nuys - Air ambulance and executive charter services.
- Quade, Paul
- Santa Ana - Certified flight instructor based out of John Wayne Airport.
- Electronic Material Industries
- Toluca Lake - Independent stocking distributor of military spec electronic components for the aviation industry.
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