McGhee Tyson Airport in Knoxville is one of a few airports in the U.S. to offer travelers the option of booking a ticket on an in-house Web site. At the airport’s Web site, http://www.flyknoxville.com flyers can search for available flights and compare ticket costs between the airlines that serve Knoxville. There is an $8 fee for booking online. The booking engine remembers a flyer’s preferences, such as frequent flyer number, seating and flight times. The airport is promoting the new site with special promotions on travel to Denver, Orlando and New York.