T1, T4, T5 and T7 are the names of the 5 terminals in JFK. If you're flying out from here, it is a good idea to figure out which one your flight boards from. This way, you'll be prepared and ready to explore all the things that it has to offer. Avoid running to your departure gate, or missing your flight entirely, by arriving 1.5-2 hours prior to domestic journeys. You should arrive 2-3 hours ahead if you're flying internationally. This will grant you enough time to check in luggage, get through security and customs and make your way to your gate. It's also a good idea to check the arrival time recommendations of both your airline and departure airport.