Passengers at O'Hare International Airport wait in a United Airlines ticketing line Tuesday, May 13, 2014, in Chicago. Smoke in a regional radar facility forced a halt to all incoming and outgoing flights at both of Chicago’s airports. The Federal Aviation Administration says all its personnel were evacuated from the Chicago Terminal Radar Approach Control, or TRACON, facility in suburban Elgin at around 11:30 a.m. Tuesday.(AP Photo/Charles Rex Arbogast)
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