JetBlue currently flies out of 64 cities located in North and South America. On August 12, 2009 they announced that they would be offering an "all-you-can-fly" pass for $599 that allows unlimited travel between September 8th and October 8th.http://www.jetblue.com/deals/all-you-can-jet/?intcmp=HPHero1Eng_All-You-Can-JetPass

Between September 8, 2009 and October 8, 2009, JetBlue is offering unlimited travel for $599. Domestic taxes and fees will be included in this deal, but international and Puerto Rico flights will incur additional taxes and fees. During this period you have to book your flight three days prior to the desired travel date. No shows will be charged $100. While you won't be able to rack up TrueBlue miles on each flight segment as usual, you will receive 35 points for purchasing the $599 deal.

This deal will only be available until August 21, 2009 or until tickets run out.