Near-blizzard conditions and record cold snarled air travel up and down the East Coast on Friday, causing thousands of flight delays and cancellations nationwide.
FlightAware.com reported 5,771 delays and 2,069 cancellations as of 10:40 a.m. EST.
Roughly 20 percent of the flights destined for New York City's LaGuardia, New Jersey's Newark and Philadelphia were canceled, the site said.
New York's John F. Kennedy International Airport suspended operations as the city's three major airports prepared hundreds of cots to accommodate stranded travelers. Boston's Logan International Airport said that up to a quarter of its scheduled flights had been canceled on Thursday.