Southwest and AirTran are having a sale with fares starting at just $49 for flights up to 500 miles. This price includes tax (!) so it's a pretty good deal. (Actually the one way total is $48.80 with tax). But you must hurry, the sale ends Friday at 2:59 a.m. Travel from August 13- November 14. Some restrictions apply.
Here are sample fares to/from Atlanta:
New York LGA- $99
Las Vegas- $139
San Francisco- $139
Considering it costs around $30-40 to get a cab from VaHi to the airport, I say this is a great bargain. Happy Flying!