Hurricane Sandy is causing trouble for travelers at Chicago’s airports.

The Chicago Department of Aviation reports that airlines have canceled more than 400 flights at O’Hare International Airport and more than 90 at Midway International Airport.

Most of the cancelations are due to the hurricane, which is expected to join up with two other weather systems on the East Coast to create a huge and problematic storm affecting 50 million people.

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Tags: mdw, natural disasters, ord, sandy