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During World War II, Pan American Airways moved their flying boat operations from Treasure Island to SFO's seaplane harbor. After the war, when land planes became widely used, Pan Am built new facilities here. This photo shows Pan Am's SFO base in 1959, with that of United Air Lines in the background. #ThrowbackThursday #PanAm #AvGeek #SFOHistory #AviationHistory Pan Am base at SFO, 1959 SFO Museum Collection 1997.52.051.008 a This image was posted on January 12, 2017.