1926 was the year that Varney's commercial air mail service began, which was a predecessor to United Airlines. In 1931 the name United Airlines was established.
Headquarters / Main Hub:
Chicago holds the headquarters for United, with its main hub being Chicago O'Hare (ORD), and major hubs in San Francisco, Denver and Washington.
phone number #800-241-6522
Frequent Flyer and Global Alliance:
The frequent flyer program of United is Mileage Plus. United Airlines is a founding member of Star Alliance.