In 1941, when the Flygvapnet (Swedish Air Force) was equipped with a mixture of fighter aircraft of Italian and US origin. The resulting design was of unusual configuration, low-wing monoplane having moderate wing sweep, with central fuselage nacelle to accommodate the pilot on an ejection seat and a rear-mounted powerplant in pusher configuration, twin booms extending aft from the wings. When introduced into service in late 1945 as the J21A-1 the new type was the only pusher-engined fighter to become operational during World War II, a total of 299 before production ended in 1948.
















