Saab J-21, fighter and attack aircraft. This model belonged earlier to Carl Edward Ericsson, chief of the SAAB test facility, the most secret unit in Saab at Linköping. Windows and doors are carefully scribed on the polished metal fueselage. First flight December 1st, 1945 and in production until 1949. 298 aircraft built and retired from Swedish Air Force July 23rd, 1954. A version with a jet engine was also produced by Saab.