To the OP, it's unclear if you've picked a specific JFK flight knowing it's currently a 777-300ER with the F suite, or you are thinking that all JFK flights get it. It's definitely not the latter - they get a mix of -200ER's, 300ER's and 787-10's. The former switch around a lot, but the 787-10 rotation, in my experience, always sticks - and that's my preferred plane now, much more pleasant experience