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

Aeropuerto de Barcelona. This airport in Spain is also referred to as BCN or sometimes LEBL
Paris Charles de Gaulle Airport. This airport in France is also referred to as CDG or sometimes LFPG
Leonardo da Vinci-Fiumicino Airport. This airport in Italy is also referred to as FCO or sometimes LIRF
Oslo Lufthavn Gardermoen. This airport in Norway is also referred to as OSL or sometimes ENGM

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".