@SFOMuseum Twitter Posts This is SFO Museum's archive of the @SFOMuseum Twitter account.
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In the late 1930s, United Air Lines asked Douglas Aircraft to develop a large-capacity, long-range, pressurized, four-engine airliner. The DC-4E featured a tripletail and a nose wheel, then unique to large passenger aircraft, and first flew in 1938. #WingWednesday #avgeek . This tweet was posted on April 07, 2021.