I just used Farecast to check out my options for a flight from West Palm Beach to Boston.
For the times I wanted, Jet Blue had a flight for $234 and AirTran had one for $93.
When I got to the AirTran website, the $93 fare was on sale with a Web Special price of $84.
That's a savings is $150.
With the savings, I decided to upgrade to an exit row for an additional $20, so I still saved $130.