Southwest Airlines Co. is a passenger airline that provides scheduled air transportation in the United States. As of December 31, 2009, the Company had 537 active Boeing 737 aircraft serving 68 cities in 35 states throughout the United States. The Company provides point-to-point service. As of December 31, 2009, the Company served 437 non-stop city pairs. Approximately 76 % of the Company’s customers flew non-stop during the year ended December 31, 2009, and the Company’s average aircraft trip stage length in 2009, was 639 miles with an average duration of approximately 1.8 hours. The Company’s point-to-point route structure includes service to and from many secondary or downtown airports, such as Dallas Love Field, Houston Hobby, Chicago Midway, Baltimore-Washington International, Burbank, Manchester, Oakland, San Jose, Providence, Ft. Lauderdale/Hollywood, and Long Island Islip airports.