More than 7,800 flights in the United States have been delayed or cancelled as of 4.45pm ET (9.45pm UK) on Friday 13 November, Fox Weather reports, as airports put out statements on the nationwide ground stop.
The figure appears to cover disruption across the whole day rather than the ground stop alone, and it has not been independently checked. Earlier delays and cancellations would be included in the count.
At Atlanta's Hartsfield-Jackson airport, FlightAware data cited by Fox 5 Atlanta showed 521 delays and 22 cancellations so far on Friday.
Tulsa International Airport says at least one aircraft had to turn around and four others did not take off as scheduled, according to News9.