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O'Hare International Airport

Chicago O'Hare International Airport northwest of the Chicago Loop. It serves as the primary and largest hub for United Airlines. Following United's merger with Continental Airlines, O'Hare will become the second largest hub for United after Houston's George Bush Intercontinental Airport. O'Hare is also a hub for American Airlines. It is operated by the City of Chicago Department of Aviation, associated with an umbrella regional authority.