- Esterline Technologies
 - Bellevue - Serves aerospace and defence markets. - Kistler Aerospace Corporation
- Kirkland - Developing a fleet of fully reusable launch vehicles to provide lower cost access to space for Earth orbiting sattelites.
- Tethers Unlimited, Inc.
- Seattle - An aerospace R&D company developing long life and high strength space tether technology.
- Ballard Technology, Inc.
- Everett - Manufacturer of avionics databus interface cards and software. MIL-STD-1553, ARINC 429, ARINC 629 and Space Shuttle databus are supported on IBM PC, VME, PCMCIA and IndustryPack computers.
- American Avionics
- Seattle - Sells, services and installs a variety of avionics and instruments.
- Soundair, Inc.
- Woodinville - Offers aftermarket, repair, and services groups which assist with inventory management, flight deck windows, surplus material management, and more.
- Pentar Avionics Corporation
- Redmond - Developer of PC-based automated test equipment for avionics.
- Modelwerks Inc
- Seattle - Prototyping and wind tunnel model development and production.
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