 The swept-wing data that was amassed at Focke Wulf was, however, utilized by the Saab design office in its preliminary work that led to the Saab J29 fighter.A member of the Saab engineering team had been allowed to review German aeronautical documents stored in Switzerland.These files captured by the Americans in 1945 clearly indicated delta and swept-wing designs had the effect of "reducing drag dramatically as the aircraft approached the sound barrier."