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United Air Lines used the Boeing 80A tri-motor to carry both mail and up to 18 passengers on scheduled flights from San Francisco to Chicago starting in 1928. Check out this amazing photo from 1929, depicting passengers next to a Boeing 80A. United Air Lines Boeing 80A 1929 SFO Museum Collection Gift of Frank A. Norick 2010.140.002 This image was posted on January 09, 2016.