All the airports that United Airlines flights have come from See the airports that United Airlines flight have traveled to / or see all the flights this airline has flown (in and out of SFO)

Frankfurt-Hahn Airport. This airport in Germany is also referred to as FRA or sometimes EDDF
Indianapolis International Airport. This airport in the United States is also referred to as IND or sometimes KIND
Hollywood Burbank Airport. This airport in the United States is also referred to as BUR or sometimes KBUR
Tokyo Haneda Airport. This airport in Japan is also referred to as HND or sometimes RJTT
Nashville International Airport. This airport in the United States is also referred to as BNA or sometimes KBNA
Fort Lauderdale Hollywood International Airport. This airport in the United States is also referred to as FLL or sometimes KFLL
Washington National Airport. This airport in the United States was also referred to as DCA or sometimes KDCA
Lambert-St. Louis International Airport. This airport in is also referred to as STL or sometimes KSTL
Paris Charles de Gaulle Airport. This airport in France is also referred to as CDG or sometimes LFPG
Singapore Changi Airport. This airport in Singapore is also referred to as SIN or sometimes WSSS
Spokane International Airport. This airport in the United States is also referred to as GEG or sometimes KGEG
Franz-Josef-Strauss Airport. This airport in Germany is also referred to as MUC or sometimes EDDM

All these flight data are available as openly licensed data on the sfomuseum-data GitHub account. If you'd like to read more about our efforts to archive flight data at SFO Museum have a look a the Mills Field weblog posts tagged "flightdata".