Flight Angels.

Chick Faber (Dennis Morgan) is grounded by Flight Superintendent Bill Graves (Ralph Bellamy) when a flight physical reveals that his eyesight is failing. While he remains at the airline, along with engineer, Artie Dixon (Wayne Morris) he continues work on the design of a secret research aircraft. After he learns that the US Army Air Corps is going to test his aircraft, he attempts to get permission to make the first flight, but is refused due to his failing eyesight. Angrily giving up his pilot's license, he decides to leave his wife and join the newly formed Chinese mercenary air force