-You must get a Free Spirit mileage number to qualify.
-Registration of your mileage number for this promo is required by 11:59pm EST on 12/24/08.
-Ticket must be purchased by 11:59pm EST on 12/24/08.
-Ticket must be for travel between 01/05/09 and 06/17/09.
-On or around 07/15/09 you will get a voucher for the amount that you spent on your ticket, less taxes and fees!
See registration link above for full terms!