If you are on the DisneyCruiseline. What happens is when you to your checkin at the beginning of the cruise they will ask for your flight details and your number of bags. Once you disembark, since Aitran is a Airline that participates with the Check In Program, you just pay for the bags when you get off the boat and your bags are taken to the airport for you and you don't have to take them to the terminal. Iam really bummed that we are flying southwest this year... this option is really convenient! Hope this helps!