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The film begins with the following written dedication and quotation: "To the men of the Royal Air Force...and to those exiled flyers who still fight for their homelands in England's skies...this story is respectfully dedicated. 'Never before in the field of human conflict have so many, owed so much, to so few....'-Winston Churchill."
The film's working title was Flight Patrol. News items in Hollywood Reporter add the following information about the production: Both Dennis Morgan and Humphrey Bogart tested for parts in the film. Footage of actual fighting between British Spitfires and German Messerschmitts and Heinkels and a London air raid were shot by technicians from Warner Bros.' Teddington studios in London and shipped to the United States for inclusion in the film. This was the last film of actor James Stephenson, who died soon after the film finished shooting. A press release dated April 16, 1941 identifies technical advisor Byron Kennerly as a pilot officer in the Eagle Squadron of the RAF. Lothar Mendes is listed as director in the early Hollywood Reporter production charts and, although Lew Seiler is credited on the screen, both Film Daily and New York Times reviews give directing credit to Mendes. Frank Wead's play was also the basis for the 1936 Warner Bros.' film Ceiling Zero, starring James Cagney and Pat O'Brien and directed by Howard Hawks (see AFI Catalog of Feature Films, 1931-40; F3.0640).