| company name | category | type |
|---|---|---|
| AgustaWestland | airframe | manufacturer |
| Bell Helicopter | airframe | manufacturer |
| Enstrom helicopter | airframe | manufacturer |
| Eurocopter | airframe | manufacturer |
| Kaman Aerospace | airframe | manufacturer |
| Robinson | airframe | manufacturer |
| Rolls-Royce | engine | manufacturer |
| Schwizer | airframe | manufacturer |
| Sikorsky | airframe | manufacturer |
| Turbomeca | engine | manufacturer |