Question: Does the Saab 38 and the Saab JAS 39 Gripen have a single-engine or multiple engines?
Sentence (from "Saab 38"): It was to replace the older Saab 105 jet trainer in the Swedish Air Force, but the aircraft never got past the drawing board and was canceled in 1979 in favour of the more advanced Saab JAS 39 Gripen fighter.
Relevant evidence: No