Headquarters: Salt Lake City, UT.
Made first flight from New York's JFK International Airport to Fort Lauderdale, FL, in February 2000. Now flies to 27 airports around the U.S. and the Caribbean with a fleet of 60 Airbus A320s.
Plans to expand fleet include an order for 202 new A320s and a fleet of 200 Embraer 190s, to be delivered from 2005.
Ticket sales system fully operated by 800 reservation agents working from home and taking more than 10 million calls a year.
Named best domestic airline by Conde Nast Traveler in 2002 and 2003.
They say: "By offering our customers the best experience we can deliver, we find most of them come back regularly and tell their friends and family about us. It's not rocket science... our customers have given us incredible word-of-mouth recommendations."