Nov. 2 (UPI) -- Transportation Secretary Sean Duffy said Sunday that the government shutdown, now in its sixth week, would continue to cause flight delays, cancellations and closures amid air traffic control staffing shortages across the country.

"We will delay, we will cancel any kind of flights across the national airspace to make sure people are safe," Duffy warned during an appearance on ABC's "This Week."

Duffy 's comments came during a ground stop at Newark Liberty International Airport Sunday, which he said could spread to airports nationwide the longer the shutdown dragged on.

As few as 20 flights per hour were arriving at Newark late Sunday afternoon, local media reported. Delays averaged about two hours Sunday, but some flights were more than three hours late.

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