Mystery Plane (aka Sky Pilot and Sky Pirate) is a 1939 American action film directed by George Waggner and written by Paul Schofield and George Waggner. The film is based on the comic strip Tailspin Tommy by Hal Forrest and Glenn Chaffin. The film stars John Trent, Marjorie Reynolds, Milburn Stone, Jason Robards Sr., George Lynn and Lucien Littlefield. Mystery Plane, the first of four "Tailspin Tommy" films made by Monogram Pictures, was released on March 8, 1939.