The Australian National Aviation Museum
Our aircraft was originally built by Douglas in July 1941 as a right hand door DC-3 277D with Wright Cyclones, for delivery to American Airlines as NC33657, but was instead impressed direct from the production line by the U.S. Military as a C50 "41-7698".
DC3 Aviation Museum
distinguishable, like all AA DC-3's to follow, by the passenger door located in the right side of their fuselages.
Pic from Airliners.net
Another pic