Chicago's Midway International Airport reopened this morning after a power outage forced the second largest airport in Chicago to shut down for four hours Thursday night.
Aviation officials said ComEd crews were called to the airport after the runways lost power at 8:45 p.m.
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Flights into the airport were diverted as crews worked to get the lights back on, but ComEd said the systems were working properly.
Officials determined an airfield lighting vault was responsible for cutting power last night. The vault was repaired and the lights came back on at about 1 a.m.
A total of 85 flights were affected by the power outages, authorities said. Those airlines affected are working to move stranded affected passengers out this morning.
Passengers stranded or expected to fly out Friday are asked to contact their individual airlines to determine if their flight is delayed or when they would be shuttled out.