'Planstudie 1939' was the German air force preparatory phase, in accordance with Generalfeldmarschall Hermann Göring’s order of 7 February 1939, making use of the first months of 1939 to ready itself for major operations in the east against Poland late in 1939 or early in 1940, and also for limited operations in the west against France (7 February/31 August 1939).