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JetBlue is having a two day sale with fares starting at $59 each way. Reservations must be booked by May 8, 2013 at 11:59pm EST for travel May 21 through June 19 (blackout dates: May 23-27).
I looked at a few random routes and fares seemed to be pretty decent, so if you have any upcoming travel you are looking to book it is worth taking a look. Also, if you already have a JetBlue reservation booked during this time, check to see if the fare went down. If it did, you can call JetBlue and they will give you a credit for the difference to be used for a future date.