Thursday, December 26, 2019 
At Chicago’s main airport amid dense fog in the region the American aviation authority has grounded all flights and the Federal Aviation Administration has announced a ‘ground stop’ on flights in and out of Chicago O’Hare International Airport, which is the Midwest city’s main hub.
Until 8.30 am local time the grounding order was valid but after the order lifts knock-on delays to departures and arrivals were expected. Until 10 am local time there was currently a dense fog advisory in place for Chicago and areas around the city.
There were many more cancellations and a handful of flights delayed at the Midway airport located south of the city.
Reduced visibility and slippery travel in dense fog in areas around Chicago was predicted by the National Weather Service.
Through mid morning dense fog persisted and an alert for slippery road was in place.
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