Operations at Chicago's two airports are returning to normal after an electrical problem at a regional radar facility forced a shutdown of all incoming and outgoing flights.

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Operations at Chicago’s two airports are returning to normal after an electrical problem at a regional radar facility forced a shutdown of all incoming and outgoing flights.

Tuesday’s three-hour halt resulted in more than 1,120 cancellations at O’Hare International and Midway International airports.

By Wednesday morning, about 100 flights to and from O’Hare were scrapped and a few dozen more were delayed. That’s according to the aviation tracking website FlightAware.com. There were only minor disruptions at Midway.

The ground stop was triggered by a bathroom exhaust fan in a ceiling that overheated and melted insulation on some wires. Smoke was pushed through the radar facility’s ventilation system and into the control room.

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The Chicago Terminal Radar Approach Control, or TRACON, facility is in suburban Elgin.

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