Book a roundtrip on JetBlue between May 5 and May 16, 2008 for travel by June 11, 2008 and you'll get a $50 voucher for travel between September 3 and October 31, 2008. This offer expires 11:59 PM MDT May 16, 2008. Registration must be completed prior to travel in order to qualify for the voucher.

The fine print: Offer may not be combined with other special offers and is available only for newly-booked travel; changes to existing travel are not eligible. Voucher may be applied only to future JetBlue travel that takes place between September 3 and October 31, 2008. If Voucher travel is changed outside of this window, Voucher will be forfeited and you will be responsible fare difference.  Voucher will be deducted off of total fare. Any amount that may remain on Voucher will be forfeited. Voucher may be used on roundtrip or one-way flights. Voucher is non-transferable. Voucher may not be redeemed for cash and may not be used toward the purchase of a JetBlue Gift Card, JetBlue Cruise, or JetBlue Getaway Package.