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)

Indira Gandhi International Airport. This airport in India is also referred to as DEL or sometimes VIDP
Detroit Metro Airport. This airport in the United States is also referred to as DTW or sometimes KDTW
Sonoma County Airport. This airport in the United States is also referred to as STS or sometimes KSTS
Port Columbus International Airport. This airport in the United States is also referred to as CMH or sometimes KCMH
Chengdushuang Liu Airport. This airport in China is also referred to as CTU or sometimes ZUUU
Melbourne International Airport. This airport in Australia is also referred to as MEL or sometimes YMML
Eppley Airfield. This airport in the United States is also referred to as OMA or sometimes KOMA
Edmonton International Airport. This airport in Canada is also referred to as YEG or sometimes CYEG
Cincinnati/Northern Kentucky International Airport. This airport in the United States is also referred to as CVG or sometimes KCVG
Eagle County Regional Airport. This airport in the United States is also referred to as EGE or sometimes KEGE
Amsterdam Airport Schiphol. This airport in Netherlands is also referred to as AMS or sometimes EHAM
Glacier Park International Airport. This airport in the United States is also referred to as FCA or sometimes KGPI

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".