Severe weather is causing travel problems in the Chicago area.
O'Hare International Airport is reporting departure delays as much as 2 hours long. Arrival traffic is experiencing airborne delays of 15 minutes or less.
The airport also announced the cancellation of 350 flights.
Flights were delayed up to 2 hours at Chicago's Midway Airport due to rain and thunderstorms. Thirty flights were canceled at that airport.
More than 300,000 Commonwealth Edison customers in Chicago and its suburbs lost power, company officials told CNN. A company spokesman said crews are working to restore power, but it could take days to return service to all customers.