I checked a few weeks back and fares had dropped, so I got more than enough credit to cover my seat assignments and checked bag fees. A few days later, I got an email that our times were changing. Only about 15 minutes on the way down, but on the way back they added lots of time to our layover. I saw that they had also added a later morning flight. (That was considerably more expensive) I called up and they happily moved us to the later flight. It's my first experience with Airtran, but, so far--so good!!
ETA: I decided to look and see what the rates were today, and now our flight down has changed from a 3:49p arrival to a 6:11p arrival. And it's the first flight of the day. Bummer! I guess I'll keep my fingers crossed that they'll change it back or add an earlier flight. We're meeting a bunch of family there and I've done a lot of people's travel arrangements...now they'll all be there way before us. No fair! LOL