Saab 37 Viggen

Single Jet

The Saab 37 Viggen (Swedish for "thunderbolt") was Sweden's first supersonic fighter designed entirely for the nation's unique defense doctrine of highway-strip operations and rapid turnaround. Entering service in 1971, the Viggen pioneered canard-delta aerodynamics decades before Eurofighter and Rafale, combining a close-coupled canard with a large delta wing to achieve exceptional short-field performance — it could operate from 500-meter stretches of rural highway, a capability no contemporary fighter matched. Powered by a license-built Pratt & Whitney JT8D turbofan with Swedish afterburner, the Viggen was among the first Western fighters to integrate a digital central computer for flight control and weapons management, predating the F-16's fly-by-wire by several years. The type served in five variants: AJ 37 attack, SF/SH 37 reconnaissance, SK 37 trainer, and the definitive JA 37 interceptor with pulse-Doppler radar and skyflash missiles. The JA 37 could sustain Mach 2+ at altitude and routinely intercepted Soviet reconnaissance aircraft over the Baltic throughout the Cold War. Swedish Air Force Viggens remained operational until 2005, replaced by the JAS 39 Gripen. Today a handful of demilitarized airframes fly in private hands, primarily in the United States, where they appear at airshows as rare examples of Cold War Swedish engineering. SkyMeter has tracked flights across airframes and operators, with the largest observed operator.