Major American airline with global routes and extensive domestic network. United Airlines, Inc. is a leading American airline headquartered in the Willis Tower in Chicago, Illinois. Founded in 1926, the company has developed into one of the world’s largest airlines by fleet size and route network, serving destinations across six continents. United is well-known for its major domestic and international hubs, including Chicago–O’Hare, Denver, Houston–Intercontinental, Newark, San Francisco, Los Angeles, Washington–Dulles, and Guam. As a founding member of Star Alliance, United offers extensive connectivity through its MileagePlus frequent flyer program, fostering global travel opportunities. The airline currently employs approximately 111,900 people and is led by CEO Scott Kirby. United continues to modernize its fleet and expand its network to maintain a competitive edge. The company generated significant revenue growth in recent years, underscoring its critical role in global aviation.