If you are talking about the original film ... Paul Mantz, a respected stunt pilot, was killed during the making of that film. Post-production, the 'Phoenix' flew again ....
A famous racing/stunt/movie pilot and collector of warplanes, Paul Mantz was flying the Tallmantz Phoenix P-1, the machine that was "made of the wreckage", in a low level pass in front of the cameras when he caught a skid on a hillock. The movie model crashed and broke apart, killing Mantz and seriously injuring stuntman Bobby Rose onboard.[2]
Although principal photography "wrapped" on 13 August1965, in order to complete filming, a North American O-47A N4725V from the Planes of Fame Air Museum (Claremont, California) was modified and used as a flying Phoenix stand-in. With the canopy removed, a set of skids attached to the main landing gear as well as ventral fin added to the tail, made it a visual look-a-like. Filming using the O-47A was completed in October/November 1965. It appears in the last flying scenes, painted to look like the earlier Phoenix P-1.
The final production utilized a mix of footage that included the O-47A, the "cobbled-together" Phoenix and Phoenix P-1.
The final credit on the screen was "It should be remembered that Paul Mantz... a fine man, and a brilliant flyer, gave his life in the making of this film..."
from Wikipedia