Work on the film went ahead, with Corman able to work with a much larger budget than he enjoyed with his earlier features. Ex-RCAF pilot Lynn Garrison supplied the aircraft, crews and facilities, and personally coordinated the flying sequences; Garrison had purchased the collection of hangars, aircraft, vehicles and support equipment accumulated for filming 20th Century's top-grossing film, "The Blue Max", after the production wrapped in 1965. The collection included replica Pfalz D.IIIs, Royal Aircraft Factory S.E.5s, Fokker D.VIIs, Fokker Dr.Is. A number of de Havilland DH.82A Tiger Moths and Stampe SV.4Cs had also been converted to represent other aircraft, for a total of 12 aircraft available for aerial scenes. As with "The Blue Max," flying sequences were based at Weston Airport in Ireland. Richard Bach, author of Jonathan Livingstone Seagull, was one of the film's stunt pilots, and wrote about some of his experiences at Weston during its production.