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Southwest Airlines Co. is an American low-cost airline. Southwest is the largest airline in the world by number of passengers carried per year. Southwest, the 6th largest U.S. airline by revenue, maintains the third-largest passenger fleet of aircraft among all of the world's commercial airlines. As of May 3, 2009, Southwest operates approximately 3,500 flights daily. Southwest is headquartered at 2702 Love Field Drive in the Love Field area of Dallas, Texas, adjacent to Love Field airport.