c/n 338 Built in 1926 as a Douglas M-4 and believed to be the last surviving Douglas mailplane. She was purchased by Western Air Service from the Post Office Department in 1927 and registered as NC1475. She remained operated by them until a crash in 1930, after which she was sold to the Continental Air Map Company of Los Angeles. She then had several owners before being bought back by Western (then called Western Air Lines) in 1940 and re-registered as NC150 to represent Western’s first M-2. She had a static restoration in 1946 and remained on display until an airworthy restoration was begun in 1974. She flew again on 2nd June 1976 and carried out a transcontinental flight before being donated to the Smithsonian Institute in 1977. From her history she is clearly an M-4 painted as an M-2, so I find it very strange that even the Smithsonian incorrectly refer to her as being an M-2. Whatever you call her, she is the last of her breed, has been beautifully restored and is seen on display at the Steven F. Udvar Hazy Center as part of the National Air and Space Museum. Washington Dulles International Airport, Chantilly, Virginia