An unidentified passenger looks at the departure screen, that shows cancellations to Amsterdam, Stockholm, Paris and London, to check the status of her flight to Europe at O'Hare International Airport in Chicago, Thursday, April 15, 2010. The volcano that has halted air travel across Europe may have happened thousands of miles away, but the ash cloud threatens to disrupt business throughout the United States. Business travel could be frozen for weeks and long-planned vacations are at risk of being canceled. (AP Photo/David Banks)
Update 3:30 p.m. More than 3,200 flights at O'Hare have been cancelled.
The Chicago Department of Aviation is bracing for the biggest storm of the year by preemptively cancelling numerous flights.
Due to winter storm conditions in the Chicago area, airlines at O’Hare International Airport have pre-emptively canceled over 1,100 flights. Airlines are reporting delays of 45 minutes or more for in/outbound flights.
At Midway, airlines have pre-emptively canceled over 100 flights so far today and are not reporting delays at this time.
Airlines at both O’Hare and Midway anticipate canceling additional flights throughout the day.
Stay tuned to NBCChicago.com for regular updates.