Just a word of caution that AirTran is constantly changing their schedules. Unless you are on the first flight out to Orlando you can almost be certain they will change your time. Sometimes it's a minor change but sometimes they make major changes. This is also true for your return flight. In June we chose a 4:15 or so flight back instead of a 2:00. Lucky for us since they cancelled the 2pm flight and people on that flight had to scramble to change their schedules.
They will eventually e-mail you and tell you about any changes, but I have found that the e-mail comes much after the changes have been made. I have learned to keep an eye out on their schedules so I don't get an unwanted surprise.