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

Detroit Metro Airport. This airport in the United States is also referred to as DTW or sometimes KDTW
John Wayne Airport. This airport in the United States is also referred to as SNA or sometimes KSNA

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".