All the airports that flights arriving at Gate A9 ( between 2021-05-25 and 2021-11-09 ) have come from See the airports that flights leaving from Gate A9 are going to / or see all the flights in and out of this gate

Denver International Airport. This airport in the United States is also referred to as DEN or sometimes KDEN
Copenhagen Airport. This airport in Denmark is also referred to as CPH or sometimes EKCH

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".