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Dennis McCormack of Rockaway, N.J. checks the departure board only to find out that his flight to Newark, N.J. has been canceled at O'Hare International Airport in Chicago, Friday, Sept. 26, 2014.

Q&A: Lingering Delays at Chicago Airports

Traffic at Chicago's two busiest airports was slowly returning to more normal levels Monday, three days after a fire at a regional air traffic control center disrupted much of the nation's air-travel system...