CHICAGO (AP) - Chicago aviation officials are reporting delays and more than 450 flight cancellations at O'Hare and Midway international airports as a winter storm bears down on the Midwest.
Most of the weather-related slow-down Thursday was at O'Hare, where some delays stretched to 90 minutes.
So far, the region is seeing high winds, rain and fog, which is reducing visibility.
Southwest Airlines has cancelled all its Midway flights after 4:30 p.m.
The National Weather Service has issued a winter storm warning for the area. Rain will turn to snow by Thursday evening. There could be 2 to 6 inches of snow in the Chicago area, with wind gusts up to 60 mph.
United Airlines and American Airlines are waiving fees for some travelers who want to change their plans.