Yukon Sourdough—a 1942 Douglas C-47A converted to a DC-3C. [Photo ... production plants in Oklahoma City in 1942 for the U.S. Air Force, originally carrying U.S. Air Force No. 42-92464.

The DC-3 was presented to the Smithsonian in 1952 ... Of the more than 13,000 DC-3s built (including the military version, the C-47), the Museum estimates that 400 are still airworthy.