I flew on AirTran once and this is the explanation I got. There is no such thing as a round-trip on AirTran. You are buying TWO one way tickets. On a flight where you connect, the whole thing is one ticket. But the return is seperate. When you add up the cost, it is not like other airlines where it costs a lot more. Two one-way tickets on AirTran are competitive to r/t on another.
Bruce Leibowitz - Jackson, MS (KJAN) - Canon 50D/100-400L IS lens