Air Transat does not do pre determined seating unless you pay, so pretty much if you pay you pick your seats if you don't they assign you whatever is left at the airport. We did go online and it is Transat charging the fee. Our travel agent told us its a good idea to pay to pick then because January to Jamaica is pretty busy, also we were able to go online today and see all the available seats, and over half the seats on the plane are already choosen, which makes me nervous seeing as its only June!! I think we will just pay to be on the safe side to ensure we get to sit together, I would be really upset if we didn't get to!