Spies of the Air (1940)
Summary: 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. (imdb)
Directed By: David MacDonald
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Coming out after the war had broken out, Spies of the Air (1940) was already old news when it was released. Didn't really matter for it wasn't exactly the most ambitious of films either, but the spy plot has it's little moments of suspense even without the biggest of names playing the parts. Perfectly watchable as long as you know you're not watching a Hitchcock.