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)

Narita International Airport. This airport in Japan is also referred to as NRT or sometimes RJAA
Lihue Airport. This airport in the United States is also referred to as LIH or sometimes PHLI
Dallas-Fort Worth International Airport. This airport in the United States is also referred to as DFW or sometimes KDFW
Salt Lake City International Airport. This airport in the United States is also referred to as SLC or sometimes KSLC
Eugene Airport-Mahlon Sweet Field. This airport in the United States is also referred to as EUG or sometimes KEUG
Palm Springs International Airport. This airport in the United States is also referred to as PSP or sometimes KPSP
Incheon International Airport. This airport in South Korea is also referred to as ICN or sometimes RKSI
Kingsford Smith Airport. This airport in Australia is also referred to as SYD or sometimes YSSY
Baltimore-Washington International Thurgood Marshall Airport. This airport in the United States is also referred to as BWI or sometimes KBWI
Los Cabos International Airport. This airport in Mexico is also referred to as SJD or sometimes MMSD
Boise Air Terminal. This airport in the United States is also referred to as BOI or sometimes KBOI
Ontario International Airport. This airport in the United States is also referred to as ONT or sometimes KONT

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".