- Air Cargo Management Group
 - Seattle - Aviation consulting firm which focuses on the worldwide air freight and express industry. - Aircraft Maintenance and Support (AMS)
- Mill Creek - Supplier of parts, inserts, tooling, and ground support equipment.
- Express Aircraft Company
- Olympia - Producing the Express and Express series 90 designs.
- Seattle Seaplanes
- Seattle - Offering charter seaplane tours of the surrounding areas.
- Galvin Flying Service Inc.
- Seattle - FBO at Boeing Field offering line service, flight training, and aircraft sales, parts, and maintenance.
- Stoddard-Hamilton Aircraft
- Arlington - Manufacturer of the Glasair and GlaStar aircraft kits.
- Soloy Corporation
- Olympia - Innovative engineering and quality manufacturing to improve aircraft safety and performance.
- Aviation Partners, Inc.
- Seattle - Designing, developing and manufacturing advanced technology blended winglets for business and commercial aircraft.
- Naverus
- Kent - Provider of performance-based navigation in aviation for RNP RNAV. Naverus helps airlines and other fleet operators to unlock economic and safety benefits by using the advanced capabilities of their aircraft.
- Precision Airmotive Corporation
- Everett - Manufactures original equipment aviation fuel systems and electrical components and overhauls radial engine equipment for general aviation.
- Geneva Aviation
- Kent - Offers seats, controls, electrical equipment and related products.
- LKD Aerospace
- Issaquah - Provides consignment, procurement, distribution, and brokering services for factory-new and aftermarket surplus parts.
- dB Systems
- Redmond - Designs and manufactures aviation audio equipment, including control panels, power amplifiers, cabin briefers, aural warning generators and accessories.
- Aerospace Distributors, Inc.
- Federal Way - Features group of aftermarket parts suppliers of Airbus, Boeing, and Douglas spares.
- Cardinal Aerospace, Inc.
- Seattle - Supplier of commercial aircraft parts and FAA approved repair station.
- Omega Aerospace Suppliers
- Redmond - Commercial aircraft tyre contractors and suppliers.
- Zephyr Aviation
- Gig Harbor - Serving the Puget Sound area with maintenance, flight training, and charters.
- Pyrobond
- Seattle - Providing composite repair equipment for aircraft maintenance.
- Bud Granley Family Airshows
- Bellevue - Featuring the T-6, Fouga Magister, and the Yak-55.
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