I love AirTran, and am flying them again in October. Their business class upgrades are great, and I have never had a problem getting one. They have a young fleet of planes, and I find them to be comfortable. I have always experienced great customer service, and have found the flight crews to be hysterical...they like to kid around. I will say that they tend to overbook, especially from their ATL hub. This is not unusual, as most carriers play this game, but we have experienced them overbooking to the extent that they have had to seek voluntary bumps for up to 12 passengers on a flight (not just the typical tow or three). On the upside, if you can take the bump, hold out for a bit as I have seen them offer up to 3 rt tickets pp, anywhere they fly, for bumping.