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.

Hundreds of flights at the busiest airports in the U.S. are being scratched this weekend. Airlines are moving forward with reducing air service due to the lingering government shutdown.

Transportation Secretary Sean Duffy announced 40 major airports would face a 10% cut in flights. See the full list of impacted airports.

Flight cancellations across the U.S. could rise to 15%—or even 20%—if the government shutdown continues, Transportation Secretary Sean Duffy said.“If this shutdown doesn’t end relatively soon, the consequence is that more controllers don’t come to work,

A small percentage of domestic flights were canceled on Friday, but Transportation Secretary Sean Duffy said the reductions, which were already going to increase next week, could sharply rise by the holidays if the shutdown continued.

Transportation Secretary Sean Duffy said Friday that flight reductions could go as high as 20 percent if the government shutdown drags on, as the Federal Aviation Administration (FAA) begins reducing flights by 10 percent due to air traffic controller staffing shortages.

The FAA released the list of affected airports Thursday, with a focus on areas that have been struggling most with air-traffic-control staffing shortages. The list includes some of the nation’s biggest, busiest airports, including those in Atlanta, Chicago, Dallas and New York City.

The FAA orders 10% flight reductions at 40 major U.S. airports starting Friday due to air traffic controller shortages during the government shutdown.