American Airlines is a major U.S. carrier headquartered in Fort Worth, Texas, and a subsidiary of American Airlines Group. Founded in 1926, it has grown through numerous mergers and acquisitions to become one of the world's largest airlines by passengers carried and fleet size. The airline operates an extensive domestic and international network spanning North America, South America, Europe, Asia, and beyond. Its primary hubs are located at Dallas/Fort Worth, Charlotte, Philadelphia, Miami, Chicago O'Hare, New York's JFK and LaGuardia, Los Angeles, and Phoenix Sky Harbor. American is a founding member of the oneworld global airline alliance, giving passengers access to a broad network of partner carriers worldwide. Its AAdvantage frequent flyer program, launched in 1981, was one of the first loyalty programs in the aviation industry.