Southwest Airlines Co. operates Southwest Airlines, a passenger airline, which provides scheduled air transportation in the United States. As of December 31, 2011, the Company was serving 72 cities in 37 states throughout the United States. During the year ended December 31, 2011, the Company added addition services in two new states and three new cities: Charleston, South Carolina; Greenville-Spartanburg, South Carolina; and Newark, New Jersey. Southwest provides point-to-point. On May 2, 2011, the Company acquired AirTran Holdings, Inc. (AirTran).