If you own or work for a company with 10 or more traveling employees, you can open an A2B account. There's no charge to join, but your company must communicate to said employees that AirTran is a preferred carrier. Other benefits are that M/B/Y coach fares are fully refundable, and B/Y fares have free upgrade confirmable at time of purchase.

Good deal, if (unlike me) you have at least 9 other people working for you.