Great question - BUF to NAS just means Buffalo Airport to Nassau Intl Airport. Now you’ll know what these unique codes when you look for flights! Freeport Grand Bahama Intl Airport (FPO), Georgetown Exuma Intl Airport (GGT), Gregory Town North Eleuthera Airport (ELH), Marsh Harbour Airport (MHH), Port Royal Bimini Airport (BIM) are some additional IATA codes for airports related to your trip.