Trapped in the Sky (1939)

In this exciting spy drama, enemy agents endeavor to steal the plans for a top secret silent aircraft. The plane's inventor wants to sell his invention to other countries but his government will only allow it if the test flights fail. The prototype is sabotaged and crashes on the first test, killing the pilot. The commanding officer shoulders the blame and ends up court-martialed. He then goes to the enemy agents and wins their trust.

Unfortunately the movie Trapped in the Sky is not yet available on HBO Max.