Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Chicago O''Hare International Airport (IATA: ORD, ICAO: KORD, FAA LID: ORD), also known as O''Hare Airport, O''Hare Field, or simply 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 serves as the primary and largest hub for United Airlines and as a hub for American Airlines. 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).