The SAAB 21 series is a Swedish fighter/attack aircraft in a twin boom pusher configuration that first flew in 1943. Of the 298 total production, 66 were of the A-3 version, equipped with a bomb aiming sight and armed with unguided rockets and bombs as well later being able to use two RATO rockets. This example is one of three J 21 survivors and is on display at this museum.

The J21A, the first of the impressive lineage of Saab fighters. Because of its pusher propeller configuration it pioneered an ejection seat, and stands very tall. It was developed into the J21R jet.