@SFOMuseum Twitter Posts This is SFO Museum's archive of the @SFOMuseum Twitter account.
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In 1934, Boeing began design studies for a four-engine bomber in conjunction with a four-engine civil airliner. The bomber version became the B-17 and was produced in large numbers. The civil airliner version emerged as the Model 307. #WingWednesday . This tweet was posted on March 31, 2021.