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

Keflavik Airport. This airport in Iceland is also referred to as KEF or sometimes BIKF
Edmonton International Airport. This airport in Canada is also referred to as YEG or sometimes CYEG

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".