American Airlines (AAL) — 1,378 Aircraft Fleet/ AA

American Airlines, founded in 1939 and headquartered in Fort Worth, Texas, is one of the world's largest full-service carriers operating extensive domestic and international passenger networks. The airline operates major hub airports in Dallas/Fort Worth, Charlotte, Chicago, Miami, and Phoenix, serving destinations across North America, Latin America, Europe, and Asia. American Airlines is a founding member of the oneworld alliance and offers multiple cabin classes including first class, business class (Flagship Business), premium economy (Premium Economy), and economy, complemented by its AAdvantage frequent flyer program. As part of American Airlines Group, the carrier also operates regional flights through subsidiary carriers and maintains a significant cargo operation. Known for its extensive route network and major presence in transatlantic and Latin American markets, American Airlines carries tens of millions of passengers annually and competes among the "Big Three" U.S. carriers.