Cold temperatures have prompted airlines flying in and out of Chicago's two main airports to cancel hundreds of flights.
Officials announced that more than 130 flights had been canceled by Sunday night at Midway International Airport. The airport also said several flights were experiencing delays of up to two hours.
By Monday morning, the city's Department of Aviation said another 80 flights were canceled at Midway.
O'Hare Airport reported more than 435 flight cancellations Monday morning.
Officials at O'Hare said the airport offered cots to stranded travelers following the cancellations.
Monday's cancellations come a day after carriers scrapped about 400 flights on Sunday because of cold, snow and wind.
With temperatures continuing to plummet on Monday, many more flights could be canceled. During another cold snap earlier this month, airlines canceled more than 1,000 flights in Chicago over a two-day period.
The National Weather Service says the air temperature was 2 degrees below zero at O'Hare Monday morning. That's expected to fall to almost 20 degrees below zero later in the night. Wind chills could make it feel like 45 degrees below zero.
The aviation department recommends travelers and those picking up travelers visit the airlines' web sites for flight status before coming to the airports.