(ABC NEWS)– More than 2,000 flights have been canceled across the U.S. on Monday as airlines catch up from a rough weekend, winter weather conditions slam parts of the country and the Federal Aviation Administration continues to limit capacity at 40 major U.S. airports, with President Donald Trump threatening air traffic controllers to “get back to work, NOW!!!”

“All Air Traffic Controllers must get back to work, NOW!!! Anyone who doesn’t will be substantially ‘docked,'” Trump said in a social media post on Monday.

In addition to the 2,100 flights canceled on Monday, there were also 6,432 delays for flights within, into or out of the United States, according to airline traffic tracker FlightAware.

The airports seeing the most cancellations on Monday include Chicago O’Hare International

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