O'Hare International Airport (IATA: ORD, ICAO: KORD, FAA LID: ORD), also known simply as O'Hare Airport or O'Hare, is a major airport located in the northwestern-most corner of Chicago, Illinois, United States, 17 miles (27 km) northwest of the Chicago Loop. It is the largest hub of United Airlines (whose headquarters are in downtown Chicago) and the second-largest hub of American Airlines (after Dallas-Fort Worth International Airport). It is operated by the City of Chicago Department of Aviation, associated with an umbrella regional authority.

In 2008, the airport had 881,566 aircraft operations, an average of 2,409 per day (64% scheduled commercial, 33% air taxi, 3% general aviation and <1% military).[1] O'Hare International Airport is the second busiest airport in the world, behind Hartsfield-Jackson Atlanta International Airportwith 69,353,654 passengers passing through the airport in 2008; a -8.96% change from 2007. O'Hare also has a strong international presence, with flights to more than 60 foreign destinations. O'Hare was ranked fourth in 2005 of the United States' international gateways, with only John F. Kennedy International Airport in New York City, Los Angeles International Airport and Miami International Airport, serving more foreign passengers.

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