CHICAGO (CBS) — As winter weather moves into the area, Chicago’s airports are canceling flights. At O’Hare a “traffic management program” was in effect for a few hours, creating hours-long delays for arriving flights.

“Due to weather,there is a Traffic Management Program in effect for traffic arriving Chicago OHare International Airport,” the FAA said. “This is causing some arriving flights to be delayed an average of 4 hours and 46 minutes.”

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This means that planes departing from other cities to Chicago are being held at their originating airports. That ground stoppage had been eased after about an hour.

As of 8;45 p.m., Chicago’s O’Hare International Airport had canceled 682 flights.

At Midway, 169 flights have been canceled.

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Delays were about 20 minutes at  Midway; nearly 30 minutes at O’Hare.  Light snow began falling around 4 p.m., but heaviest is expected to fall between 8 p.m. and midnight.