Transportation Secretary Sean Duffy warned as many as 20% of flights could be canceled if the government shutdown drags on.

Follow live updates as flight reductions begin today at 40 high-traffic airports in what officials have described as a "proactive" effort to alleviate pressure points.

Some Delta, American and United flights have been canceled at CVG amid the government shutdown-related cuts. See which ones here.

As many as 20% of U.S. flights could be cut in the coming days if the shutdown continues, Transportation Secretary Sean Duffy said.

"This is about where’s the pressure and how do we alleviate the pressure," Transportation Secretary Sean Duffy said.

Airlines are scaling back flights at dozens of major U.S. airports to ease the pressure on air traffic controllers, who have been working unpaid under the ongoing government shutdown.

The FAA's flight cuts and cancellations continue at some of the nation's busiest airports. Founder of the Points Guy Brian Kelly joins The Weekend to discuss the big impact those could have on holiday travel.

Anxious travelers across the U.S. felt a bit of relief Friday as airlines mostly stayed on schedule while still cutting more than 1,000 flights largely because of the government shutdown.

FAA’s flight reductions at major airports will strain capacity for time-sensitive shipments like pharmaceuticals, electronics and perishables.