Pilot X (Aka Death in the Air)

A deranged flyer calling himself Pilot X wreaks havoc by shooting down passenger planes. Inspector Gallagher of the Bureau of Aeronautics and the eminent Dr. Norris assemble an international team of flying aces in an effort to capture Pilot X. The pilotsengage in furious aerial battles with the killer and are shot from the sky one by one. A final deadly battle between the group's ace gunner and the aerial maniac grounds the killer and exposes X's identity. Skillful use of dogfight footage adds to the sense of high altitude danger in this whodunnit of the skies.