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The Loop is the central business district of Chicago, Illinois. It is one of the city's 77 designated community areas. The Loop is home to Chicago's commercial core, City Hall, and the seat of Cook County. The community area is bounded on the north and west by the Chicago River, on the east by Lake Michigan, and on the south by Roosevelt Road, although the commercial core has expanded into adjacent community areas.
It is the largest hub of United Airlines and the second-largest hub of American Airlines. The airport is connected to Chicago by train using the Blue Line of Chicago 'L'. It runs 24 hours a day. The transit time from Central Loop to O'Hare International airport is approximatemily 40 minutes.