More than 1,400 flights were cancelled as a blizzard struck many states in the south-east of the US.
At least three people were killed and hundreds of thousands left without power as snow, sleet and freezing rain hit states from Georgia to West Virginia.
Many schools, businesses and government offices were closed as the severe conditions caused by Winter Storm Diego worsened with a state of emergency declared in North Carolina.
Flight cancellations and delays continued yesterday at Charlotte Douglas International airport, the sixth busiest airport in the country.
The airport had almost 400 flights grounded, about 20% of its scheduled services.
American Airlines had cancelled 1,100 flights to and from the hub in North Carolina on Sunday, with a number of Southwest Airlines services also affected.
People in the city of Charlotte were warned to stay away from Duke Energy Centre, a 48-storey tower which has had large chunks of ice falling from it, Sky News reported.
More than 244,000 power outages were reported across the region on Monday morning, with North Carolina suffering the worst of the extreme conditions.
South Carolina, Virginia and Tennessee were also affected by power cuts.
The worst of the storm has passed, although roads could still be slippery due to ice, according to the US National Weather Service.
American Airlines said yesterday: “Operations at our Charlotte hub will begin to normalise this morning, with scattered cancellations expected throughout the day. The majority of these cancellations will be on smaller, regional aircraft.”