History: In 1949, Saab designers began work on a new supersonic, all-weather, single-seat fighter for the Swedish air force. Designer Erik Bratt came up with a unique double delta shape that offered an aerodynamic package along with structural stability. The double delta shape means that the wing is comprised of two different wing sections with different sweep angles. The inner wing, with an 80-degree angle, is optimized for high-speed performance, while the outer wing, with a 60-degree angle, is optimized for low-speed performance. The design also featured fully-powered controls, a combination of external and integral fuel tanks, and retractable tricycle landing gear that was complemented by two retractable tail wheels. This feature allowed a tail-down landing, which made good use of the aerodynamic braking effect of the wing. The Draken is capable of short takeoffs and landings, which meant that it could be stationed at small airfields.

The first Saab-35 prototype featured a Rolls-Royce Avon turbojet engine. It was flown on 25 October 1955, and the J 35A Draken ("dragon") began entry into the service in March 1960. The series-built aircraft used Volvo Flygmotor RM6B turbojets, which were license-built versions of the Rolls-Royce engine. Saab exported the plane to Denmark, Finland and Austria, where they were used as trainers, fighters and tactical reconnaissance planes. Finland also manufactured the Draken for a short time: twelve planes were built at the Valmet factory. The plane also was offered unsuccessfully to the Swiss air force, and Venezuela and Singapore were reportedly interested in purchasing the Draken, although no sales were made to these countries.

Major production variants included the J 35A, the first production version; the Sk35C, a two-seat operational trainer without combat capability; the J 35D, an improved production version with a more powerful engine, advanced avionics and a zero-zero ejection seat; the S 35E, a tactical reconnaissance version with five cameras in the nose and cameras in one or both cannon bays; and the J 35F, the final production version with more advanced avionics and equipped to carry Hughes Falcon missiles instead of Sidewinders.