Fares must be booked on spiritair.com by 11:59 PM EST on January 12, 2007 for travel on Mondays, Tuesdays, Wednesdays and Thursdays between January 16, 2007 and May 23, 2007. The lowest fares are available on Tuesdays and Wednesdays only, with fares slightly higher on Mondays and Thursdays. Fares are for coach class travel and reflect the spiritair.com discount. Fares are each way based on roundtrip purchase, and roundtrip travel is required, but may be combined with other valid and applicable Spirit Airlines fares on other days of the week. A 7 day advanced purchase is required. Fares do not include (a) a segment tax of $3.30 per U.S. domestic flight segment of a passenger's itinerary: a flight segment is defined as one takeoff and landing; (b) up to $18 per roundtrip in local airport charges; and (c) September 11th Security Fee of $2.50 per enplanement originating at a U.S. airport, up to $5 per one way or $10 per roundtrip. Virgin Island / Puerto Rico fares do not include government taxes and fees of $14.50. International fares do not include government taxes and fees up to $125 per roundtrip. Fares are subject to availability and may not be available on all flights or on all days. Previously purchased tickets may not be exchanged for these new sale fares. Certain restrictions apply. For best results, please book early.