Although here were many cases when Allied pilots downed over the Nazi occupied territory were able to evade capture or to escape and to return to combat, non of those cases involved hijacking of airplanes. Perhaps it happened because unlike Soviet prisoners many of whom were forced to provide labor services and had close access to German planes, captured Allied airmen were kept in prisoner of war camps.
The are only two cases that I know of in which Allied airmen came close to using an aircraft to facilitate their escape from captivity.
First happened in August 1941 to Douglas Bader who after a mid-air collision with Bf109 bailed out over France. Upon capture he was invited by Adolf Galland to stay at Luftwaffe airbase before being transferred to POW camp. During the visit Badder was allowed unprecedented access to the field and airplanes. While sitting in the cockpit of Bf109 Badder asked Galland if he would be permitted to test the machine over the airfield. Galland gallantly declined he request motivating it that he did not want to chase and shoot down Badder for whom he had outmost respect and nothing but friendly feelings.
The second case involved an attempt of a group of British POW to build a glider that could carry a couple of them from the castle in which they were imprisoned. However by the time the construction was almost finished the Allied forces were only a short distance away and the escape did not occur. Sometimes in late 1990 a group of surviving POW and volunteers build and flight tested the copy of that glider which although designed and build with most primitive tools and methods, turned out to be a wonderful flyer.