I believe that AirTran also allows the ticket to originate at BWI.

Also, the routing must be a nonstop and direct flight, and you don't really get to pick your airline. However, since the routing must be nonstop or direct, you have almost an excellent guess as to what the airline will be (i.e., only Delta flies ATL-AUS nonstop). The ticket must include a Sat-night stay and advance purchase requirements apply, since AirTran actually purchases tickets on their competitors for you. The upside is that you can earn miles on that carrier, and in many cases upgrade if you are elite (unless it is Delta and the fare is non-upgradeable, etc.).

If things stay sour with US Airways, I'm planning on switching the bulk of my travel to AirTran. They have a great east coast/midwest route network, and most of their flights will be operated by fresh new 717s by year end. The 717s are every bit as good as a new 737-700/800 or Airbus narrowbody jet. The Business Class on the 717 is more spacious than First Class on a lot of airlines.

AirTran has a program called A2B for small businesses, and the benefits appear to be free upgrades to Business Class, no change fee (even on restricted tickets), double segment credits, fully refundable nonrefundable fares, and seat assignments regardless of fare paid (only higher fares qualify for advance seat assignments for everyone else).

If you don't qualify for A2B, AirTran's simplified fare structure, $35/segment upgrade fee, low $50 change fee, low walk-up fares, etc., make it a good choice.

Something to consider,