 The flying that was filmed specifically for the film was done by the Associated Motion Picture Pilots, colloquially known as the "Suicide Squadron".Other re-used footage was a crash scene which came from "Lilac Time" (Warners, 1928).The period-accurate aircraft assembled for the film included five Thomas-Morse Scouts, four Nieuport 28s, two de Havilland DH-4s, a Curtiss JN-4 and assorted post-World War I types used as "set dressing".