The flight arrives JFK at terminal 4. You are there when you arrive...
terminal 1
Terminal 3.
Terminal 2.
It leaves from the south terminal
Terminal 2.
All flight numbers between 8000 - 8999 operate from the North terminal and all other flight numbers operate from the South Terminal.
Terminal 1
Terminal C.
Terminal as in the end of something, namely the flight.
A terminal building is the area in an airport where passengers check in and wait for their flight.
Free flight assessable flight open flight or terminal flight