The Saab 37 Viggen (Swedish for "the bolt" or "the tufted duck") is a retired Swedish single-seat, single-engine, short-medium range combat aircraft. Development work on the type was initiated at Saab in 1952 and, following the selection of a radical delta wing configuration, the resulting aircraft performed its first flight on 8 February 1967 and entered service in 21 June 1971. It was the first canard design produced in quantity. The Viggen was also the most advanced fighter jet in Europe until the introduction of the Panavia Tornado into operational service in 1981.

During the later half of the 1970s and into the 1980s, the introduction of various variants of the Viggen proceeded; these included the SK 37, a two-seat operational-conversion trainer, introduced in 1972, the SF 37, an overland reconnaissance model, introduced in 1977, and the SH 37, a maritime reconnaissance version, introduced in 1975. By September 1980s, the JA 37 fighter-interceptor model of the Viggen was introduced, Bravalla Air Force Wing (F 13) being the first wing of the Swedish Air Force to convert to the new type. The Viggen went on to become Sweden's primary air defense platform for many years.

Controls:
AG1: Jettison Fuel Tank
Trim: Adjust trim