Spies of the Air
Set just before the outbreak of WWII, this is the story of a test pilot who works for the (unnamed) enemy. Made in 1939, by the time it was released in 1940, war had been declared.
Genres: Adventure
Directors: David MacDonald
Writers: A.R. Rawlinson, Bridget Boland, Jeffrey Dell
Cast
IMDB: tt0033090