Travel Deal of the Day (May 10, 2007)
Airtran has started an airfare war that most major carriers have matched on a route-by-route basis, with fares starting at $39/way.

The Deal:
Travel on various major carriers in markets served by Airtran for as low as $39/way. Fares are lowest on Tuesday and Wednesday, but higher fares are available all other days except Sunday. Travel must be purchased by Friday, May 11, 2007. Travel must be completed by November 13, 2007.

How:
Search for sale fares at an aggregator website such as kayak.com.