Spielberg attempted to portray the era accurately, using period vehicles and aircraft. Four Harvard SNJ aircraft were lightly modified in France to resemble Mitsubishi A6M Zero aircraft. Two additional non-flying replicas were used. Three restored P-51D Mustangs, two from 'The Fighter Collection' of England, and one from the 'Old Flying Machine Company', were flown in the film. These P-51s were flown by Ray Hanna (who was featured in the film flying at low-level past the child star with the canopy back, waving), his son Mark and "Hoof" Proudfoot and took over 10 days of filming to complete due to the complexity of the planned aerial sequences, which included the P-51s actually dropping plaster-filled replica 500 lb bombs at low level, with simulated bomb blasts. A number of large scale remote control flying models were also used, including an 18-foot wingspan B-29, but Spielberg felt the results were disappointing, so he extended the film contract with the full-size examples and pilots on set in Trebujena, Spain. J.G. Ballard makes a cameo appearance at the costume party scene.