SAAB Viggen adapted for FSX This was the ex payware Saab J37 Viggen from Virtavia/Alphasim created back in 2005 and now available for freeware. Modifications and aircraft.cfg in VC and 2d panel so that it now work in FSX. The Saab 37 Viggen (aka Thunderbolt) was a Swedish single-seat, single-engine, short-medium range fighter and attack aircraft, manufactured between 1970 and 1990. Several variants were produced to perform the roles of all-weather fighter-interceptor, ground-attack and photo-reconnaissance, as well as a two-seat trainer. Several models, armed/unarmed, included. Also includes military single jet sounds. Model and textures by Alphasim. FSX updates by Danny Garnier