United Airlines is a major American airline headquartered in Chicago, Illinois. It is one of the largest airlines globally and a founding member of the Star Alliance, which is one of the largest airline alliances worldwide.
United Airlines operates an extensive domestic and international route network, serving destinations across the Americas, Asia, Europe, Africa, and Oceania. The airline operates from several hubs in the United States, including Chicago O'Hare International Airport, Denver International Airport, Houston George Bush Intercontinental Airport, Los Angeles International Airport, Newark Liberty International Airport, San Francisco International Airport, and Washington Dulles International Airport.