Today’s leading turbine helicopter manufacturers include Airbus, Bell, Enstrom, Leonardo, MD Helicopter, Robinson, and Sikorsky. Buyers shopping the pre-owned market will find additional out-of-production models available, including those produced by Agusta, Eurocopter, and others.Popular piston helicopters are built by Enstrom (F-28F and 280FX), Guimbal (Cabri G2), Robinson (R22 and R44 Raven) and Schweizer (300C). Again, buyers shopping the pre-owned piston helicopter market will find additional out-of-production models available, including, for example, the Bell 47.