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

Honolulu International Airport. This airport in the United States is also referred to as HNL or sometimes PHNL
Kahului Airport. This airport in the United States is also referred to as OGG or sometimes PHOG
Norman Y Mineta San Jose International Airport. This airport in the United States is also referred to as SJC or sometimes KSJC
Tokyo Haneda Airport. This airport in Japan is also referred to as HND or sometimes RJTT

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".