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The working title of this film was Pilot X. According to NYSA records, an affidavit was filed on March 10, 1938 with the New York State censors to change the title to Pilot X (the title of the print viewed) and on May 13, 1943 to change it to Mysterious Bombardier. Variety erroneously called the film Death in the Sky. Though the onscreen credits contained a copyright statement, no entry was found in the copyright register. According to Hollywood Reporter, this was Fanchon Royer's first production for her new company. Film Daily reported that noted "G-Man" Melvin Purvis was offered a role in this film, but turned it down.