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The following written prologue appears before the onscreen credits: "We gratefully acknowledge the cooperation of those in authority who made the release of the 'Flying Saucer' film possible at this time." Portions of the film were shot on location in Alaska. The term "flying saucer" was coined in June 1947, when a businessman named Kenneth Arnold, who was piloting a small plane over the Cascade Mountains in Washington, claimed to see a group of shiny disks flying through the air at more than twelve hundred miles per hour. A wave of similar sightings followed. The Flying Saucer was the first feature film to deal with this phenomenon.
According to a September 21, 1949 article in Los Angeles Examiner, Mikel Conrad claimed to have obtained footage of actual flying saucers while shooting Arctic Manhunt in Alaska in the winter of 1947. The article added that the nine hundred feet of film, which the government had been holding in a sealed vault in Los Angeles, would be released to Conrad for use in The Flying Saucer. Documentary footage did not appear in the viewed print, however.