Fog snarls flights at Chicago’s O’Hare, Midway airports

Dense fog has caused flight delays and some cancellations at Chicago’s O’Hare and Midway international airports early on Christmas Eve during one of the busiest travel days of the holiday season

CHICAGO — Dense fog caused flight delays and some cancellations at Chicago’s O’Hare and Midway international airports early on Christmas Eve — one of the busiest travel days of the holiday season.

The Federal Aviation Administration briefly grounded flights at both airports until about 8 a.m. Tuesday and eased those restrictions as the fog cleared.

The National Weather Service said “dense, freezing fog” developed overnight throughout the city and its surrounding suburbs, leading to travel difficulties in the air and on the ground. The weather service reported visibility at Chicago’s airports was less than a quarter of a mile (400 meters) in some spots.

“These are just about the worst conditions you can have for flying,” weather service…