United Airlines is a major airline headquartered in Chicago, Illinois. It is one of the largest airlines in the world and operates a large domestic and international route network. United Airlines offers flights to destinations in North America, South America, Europe, Asia, and Oceania. The airline is a member of the Star Alliance, which is the world's largest airline alliance. United Airlines operates a fleet of various aircraft types, including Boeing and Airbus planes. The airline offers various cabin classes, such as Economy, Premium Economy, Business, and First Class. United Airlines provides services and amenities such as in-flight entertainment, Wi-Fi, and premium airport lounges.