nope, only can get exit row seats at the airport. As for self check in, not possible to get it through the self check in either, HOWEVER, to avoid that long line at JFK, you should do the self check in or check in online and get a boarding pass to go through security than go to the customer service counter (to the right of security) and ask to switch to a exit row seat. That always works if you dont have any check bags. You cant miss the counter, it says Customer Service / Seat Selections. Than again, you can always use the no check bag line at JFK too if it isnt that long.