International 250,000-member aviation organization dedicated to recreational flying and aviation participation. Members include pilots and non-pilots, designers, builders, restorers and enthusiasts of vintage, experimental amateur-built, ultralight, rotorcraft and warbird aircraft. Hosts annual EAA AirVenture fly-in at Oshkosh, Wisconsin, with 600,000 attendees and 10,000 aircraft. Nearly 1,000 chapters worldwide.