Get a Free Round-Trip Ticket on AirTran Airways

This sounds almost too good to be true: When you sign up for an AirTran Airways Visa card and make a purchase, you immediately receive eight "A+ Rewards credits," enough to nab you a one-way coach seat on the airline. Transfer a balance from another credit card and you'll get 10 more credits, enough to make that ticket round-trip. What's the catch? There's none that I can see, though you do have to pay a $39 annual fee for the card itself. Wichita, here I come! [via Inc.com]