Last year, we actually got business class seating on AirTrans when we arrived at the gate. It seems our TA did not get us the assigned seating prior to departure. Once arriving at the airport, there were no two seats together in coach. Therefore, we were lucky enough to get business class. As for upgrades on ships, I agree with IslandCruz, most ships are sold out on boarding day. If there happens to be rooms available, there would be an surcharge to upgrade. We've tried it, and turned it down. Not much of a savings based on booking the upgrade originally.