(CNN) -- In the wake of dangerously cold temperatures and winter weather across the nation, air transportation cancellations and delays continue to impact travelers Monday.
More than 1,575 flights within, into or out of the US had already been canceled by 9 a.m. ET Monday, according to flight tracking website FlightAware, while 1,875 flights had been delayed.
The post-holiday travel chaos is affecting much of the country, with the site reporting the most cancellations at Atlanta's Hartsfield-Jackson International, followed by Denver International Airport, Baltimore Washington International Thurgood Marshall Airport and Chicago Midway International Airport.On Sunday, Christmas saw 3,178 flights canceled and 6,870 flight delays.
A winter storm that swept across the United States was ill-timed for travelers who had started pushing Christmas week flying numbers back toward pre-pandemic levels.
On Christmas Eve, there were a total of 3,487 flights canceled, according to FlightAware. Friday was the worst day with 5,934 cancellations, while Thursday saw almost 2,700 cancellations.
This megablast of winter weather across the eastern two-thirds of the nation is forecast to slowly moderate this week.