Saab 37 ViggenSaab 37 Viggen airplane model. Designed to meet exacting Swedish requirements, the innovative SAAB 37 Viggen (Thunderbolt) multi role fighter was for many years the backbone of Sweden's air defence, and today five of the Flygvapnet's front line Flottiljer continue to fly the type. The first Viggen prototype made its maiden flight in 1967, and the initial production AJ 37 attack fighter (108 built) flew in 1971. The other major variants comprised 27 SF