American Airlines, Inc. (AA) is a major United States-based airline, operating an extensive international and domestic network, and is the world's largest airline by passengers flown, fleet size and revenue, and the second-most by number of destinations, only after United Airlines. It operates from its hubs at Dallas/Fort Worth, Charlotte, Los Angeles, John F. Kennedy International Airport in New York, Miami, O'Hare International Airport in Chicago, Philadelphia, Phoenix, and Washington, D.C., while its primary maintenance base is at Tulsa International Airport. The company, which is headquartered in Fort Worth, Texas, also has a significant presence in Boston, London-Heathrow, New York-LaGuardia and San Francisco. The airline primarily competes with Delta, United, and Southwest.
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