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

General Mitchell International Airport. This airport in the United States is also referred to as MKE or sometimes KMKE
Cancun Airport. This airport in Mexico is also referred to as CUN or sometimes MMUN

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".