Just saw this on MSE not one for everyone but a great deal if you are already lucky enough to be in the US for a month and want to fly around.
Choose from 57 cities and more than 600 daily flights!
Enjoy unlimited travel with our All-You-Can-Jet Pass! For just $599* you can take JetBlue anywhere you like, as often as you like, from September 8 to October 8, 2009. Use your All-You-Can-Jet Pass for business, for pleasure, to visit your favorite cities or to meet with a client. You might as well just do it all! With more than 50 cities to choose from, and for just $599, it's a deal you can't pass up.
About the Pass
* $599 for a month of unlimited travel, any available seat
o Domestic taxes and fees included
o International and Puerto Rico taxes and fees not included
* On sale through Friday, August 21, 2009, or while supplies last
* Travel Dates: Tuesday, September 8, 2009 through Thursday, October 8, 2009