Holiday Travel Begins At Chicago's O'Hare Airport Ahead Of Christmas Week

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A passenger smokes a cigarette outside terminal 3 at O'Hare... News PhotoAirport,Airport Terminal,Business,Chicago - Illinois,Cigarette,Commercial Airplane,Finance,Horizontal,Human Interest,Illinois,O'Hare Airport,Passenger,Smoke - Physical Structure,Transportation,Travel,USAPhotographer Collection: Getty Images News 2012 Getty ImagesCHICAGO, IL - DECEMBER 21: A passenger smokes a cigarette outside terminal 3 at O'Hare International Airport on December 21, 2012 in Chicago, Illinois. Today, the busiest air travel day of the Christmas holiday, an estimated 200,000 travelers are expected to travel through O'Hare Airport. (Photo by Scott Olson/Getty Images)