About 500 flights have been canceled within, into or going out of the United States on Christmas Eve so far, according to flight-tracking site FlightAware.
As of 10:49 a.m. ET, exactly 503 flights were canceled, with about 30 flights canceled over the course of one hour.
Globally, there were over 2,000 flight cancellations in total, according to FlightAware.
The Transportation Security Administration says it screened 2.19 million people at airports across the country on Thursday, the highest figure since the uptick in holiday travel started a week ago.