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The Douglas C-51 was the designation given to a single DC-3 impressed directly from the production lines after the Japanese attack on Pearl Harbor. Like the aircraft designated as C-49s and C-50s, the single C-51 was powered by two Wright R-1820 Cyclone engines (in this case the -83 model). It differed from the standard military C-47 in having its passenger door on the right hand side, but it probably gained its separate designation because it was being built for Canadian Colonial Airways, while the majority of impressed aircraft were being constructed for American airlines.