Great Plains Aircraft Supply Company
Great Plains Aircraft Supply Company is a United States aircraft manufacturer of experimental plans based primarily on the Volkswagen air-cooled engine. Great Plains provides VW engine conversions for use in experimental aircraft.
Great Plains has been selling and manufacturing conversions of VW engines since circa 1982. Among their offerings is the Great Plains Type 1 Front Drive engine series.
Great Plains also holds the rights to the Sonerai series of aircraft designed by John Monnett. Previous owners of the design were INAV Experimental in 1987.
Aircraft
| Model name | First flight | Number built | Type |
| Sonerai | 1974 | Number built 1400+ | 4130 Tube and fabric with aluminum wings |
| Easy Eagle 1 Biplane | 2010 | Number built 5+ | Tube fuselage and wood-and-fabric wings Biplane |