$599 All-you-can-fly with JetBlue

This may be appealing to many business people who fly a lot, if you can get your company to agree. I know that I've certainly spent over $599 on flights this week alone (including two JetBlue flights) and with this program I would be ahead:

http://www.boston.com/travel/blog/2009/08/jetblue_offers_3.html