United Airlines, Inc. (commonly referred to simply as "United") is an American major airline headquartered in Chicago, Illinois. United is a wholly owned subsidiary of United Continental Holdings following a $3 billion merger in 2010. The airline was owned, at one point in its history, by The Boeing Company, one of the world's largest aircraft manufacturers.
United operates out of nine airline hubs in the continental United States, Guam, and Japan. George Bush Intercontinental Airport in Houston is United's largest passenger carrying hub handling 16.6 million passengers annually with an average of 45,413 passengers daily, while Chicago-O'Hare is its largest hub in terms of daily departures. The company employs over 88,500 people while maintaining its headquarters in Chicago's Willis Tower (formerly known as Sears Tower). Through the airline's parent company, United Continental Holdings, it is publicly traded under NYSE: UAL with a market capitalization of over $10.5 billion as of October, 2013.
United's main competitors in its domestic market are Delta Air Lines and American Airlines. United is using Continental's air operator's certificate and it surrendered its original certificate when the merger closed.
As of November 2013 United Express Airlines received $31,660,211 in annual Federal subsidies for Essential Air Services that they provided through Silver Airways and SkyWest Airlines to rural airports in the U.S.