- Aerospace Corporation
 - El Segundo - Providing expertise in systems engineering, space technology, launch vehicles, satellite systems, ground control systems, and remote sensing. - Eidetics Corporation
- Torrance - Specializes in advanced aeronautical research and technology development. Also features University Desktop Water Tunnel teaching tool for high schools and universities.
- Mojave Airport@
- Mojave
- J.P. Instruments
- Santa Ana - Manufacturer of engine data management systems including navigation, scanners, fuel flow, and more.
- Sabritec
- Irvine - Manufacturer of special connectors, cable assemblies, and filter connectors.
- McStarlite Co.
- Harbor City - Aerospace manufacturer and sheet metal and bulge forming specialist, producing large, complex sheet metal components.
- Hi-Temp Insulation, Inc.
- Camarillo - Provides the aircraft, missile, and space industries with products used to solve thermal and acoustical problems.
- Global Aerospace Corporation
- Pasadena - Specializing in technology development and advanced system engineering.
- Control Sciences, Inc.
- Chatsworth - Manufacturer of synchro and resolver converters for position measurement and control.
- Magl Power Inc.
- Torrance - Manufactures, designs and engineers technically advanced solid state 400Hz frequency converters, for use in the aerospace industry.
- Phillips Aerospace
- City of Industry - Supplies test and control, realtime data acquisition, signal processing, radar, telemetry, satellite test systems, and realtime simulation systems for commercial and defence companies.
- Mexmil Company, The
- Santa Ana - Manufactures thermal and acoustical insulation systems for the aerospace industry.
- Adams Rite Aerospace, Inc.
- Fullerton - Manufacturer of components for both the commercial and military aircraft industry.
- Kaiser Electroprecision
- Irvine - Providing aerospace parts and equipment, such as actuators, missiles, pilot controls, and Rollmet seamless steel pipes.
- General Kinetics
- Lake Forest - Provides research and development of hydrogen peroxide gas generators, rocket engines, and catalysts for propulsion and power systems.
- Seco Seals
- Costa Mesa - Gasket inventor and manufacturer.
- Ryan Sales International
- Newhall - Marketing company that represents Aerospace Manufacturers throughout the world. We are aerospace consultants and a manufacturers representative.
- Wyvern Technologies
- Santa Ana - Build to print high reliability electronics components for aerospace and defence contractors.
- Condor Pacific Industries
- Westlake Village - Manufactures single and multi-axis rate and acceleration sensors , and inertial measurement and reference systems for industrial military space applications.
- Romstar Engineering
- Anaheim - Specializes in the making of parts for the aerospace industry.
- Structural Integrity Engineering (SIE)
- Chatsworth - Offers consulting services for aircraft certification, structural design, analysis, and component qualification.
- Space Tourism Expo
- Pasadena - Celebrating the emerging space tourism industry. Pasadena, California 2002.
- Dav-Lear Systems, Inc
- Diamond Bar - Minority owned business specializing in engineering for the aerospace industry.
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