The Restorers (2003)

The Restorers (sometimes referred to as The Restorers: Giving History a Future...) is a 2003 documentary film by Adam White about restoration of vintage war planes ranging from the F4U Corsair to the B-17 "Yankee Lady". White interviewed dozens of people who have dedicated much of their lives and thousands of dollars to restore planes for museums, air shows, or their own personal collections. The subjects range from people who restore planes in their own garages to major corporations; the end results range from planes that are used in exhibitions and air shows to planes that are restored as racing vehicles.

More at Wikipedia.