I am flying my son down to join us for the weekend while we are in Disney. He will will be flying on Air Tran. He will not need to check in luggage. How early should he arrive at the airport, does it make a difference if he is not checking baggage? How early should he get to the airport to choose his seat? I bought him the cheap seat where you choose at check in, saved almost $200.00. What size baggage can he bring without checking it in? Can his bag have wheels? How is Air Tran? He is 18 and will be 19 at time of travel. He has flown befor with us and the university wrestling team. He is not worried about it, I of course am. Thanks for your help.