Trainer version was called Sk 60, while the military version remained SAAB 105. Some of the aircraft were exported to Austria. The fuselage is narrow with a large, triangle-shaped tail fin. Smaller fins are located under the fuselage. Semi-circular air intakes are located on either side of the fuselage.
Landing gear is retractable.
First prototype AJ 37 flew in 1967. It was followed by trainer SK 37 and reconnaisance version SF 37. JA 37 was modified in 1977. 1xVolvo RM8, 127.50 kN of afterburner thrust Max. 6000 kg Max.