Negative $1, $2, $3 and $4 fares must be booked on spiritair.com between 5:00 AM ET on September 18, 2007 and 11:59 PM ET on September 19, 2007 for travel on the dates as specified by individual market and by market direction. The amount of the respective negative fare will be applied to the taxes and fees associated with the fare and will not be refunded to the purchaser or traveler. All other fares must be booked on spiritair.com between 5:00 AM ET on September 18, 2007 and 11:59 PM ET on September 19, 2007 and are valid for travel on Tuesdays, Wednesdays and Saturdays between September 25, 2007 and December 15, 2007 and require a 7-day advanced purchase. All fares are for Deluxe Leather class travel and reflect the spiritair.com discount.