Great question - ADL to JFK just means Adelaide Airport to New York John F Kennedy Intl Airport. Now you’ll know what these unique codes when you look for flights! This flight route has multiple associated airports, so we think it might be helpful to learn the name and codes of them as well. They are Newark Airport (EWR), New York LaGuardia Airport (LGA), Buffalo Airport (BUF), Syracuse Hancock Intl Airport (SYR), Rochester Greater Rochester Intl Airport (ROC).