If you prepay for those $13.00/$15.00 seats, you will be guaranteed Boarding Zone 1. However, if you wait until the 24 hour mark and go in and get them for free you will be in Boarding Zone 7. I've seen this many times. I always paid for those $13.00/$15.00 seats as soon as I booked my flight, because it is important to me to have an aisle seat close to the front and overhead space for my carry on. Due to Air Tran pulling out of Dallas last Nov, I can no longer fly them, but when I did, every single flight I'd hear someone arguing with the gate agent that they should be in Boarding Zone 1, because they were in those first fourteen rows or so. I can't count the number of times I've heard the gate agent explaining that you get Boarding Zone 1 only if you prepay for those front seats. If you wait until the 24 hour mark, you get them for free, but the trade off is, you get Boarding zone 7 and more than likely will have to gate check your carry on, because everyone fills those front bins first. In fact, the last time I flew Air Tran (last fall) I was sitting/talking to a lady next to me in the terminal. I boarded with my Boarding Zone 1 pass and was surprised a little while later when she sat down right next to me. She told me she changed her seat at the 24 hour mark, hoping for Boarding Zone 1 and didn't realize you didn't get it unless you actually paid for those seats. Instead if you choose for free at the 24 hour mark, you get stuck in the very last boarding zone.