Chances are you will be in one of the Airbus 330's as I don't think US is flying anything else TA these days. Beware of the "2" seats in the 2-4-2 configuration. Usually these are the primo seats on a TA flight in Y as you are not in the dreaded middle but in the US A330's, the mechanics for the inflight entertainment are mounted under the seats. Seat A and H will show up on seatguru as having "obstructed" legroom but this is a massive understatement. There is essentially NO legroom on those seats and you're better off in the middle, especially if the flight is lightly loaded.