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.

As many as 1,800 flights could be affected on Friday alone, according to Cirium, an aviation-data provider. The final figure will depend on which airports are targeted. The FAA estimates that it handles an average of more than 44,000 flights a day.

Beginning next week, daytime rocket launches are all officially scrubbed thanks to the government shutdown.

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

Only two flights have been canceled so far at McGhee Tyson on Nov. 7. Knoxville, so far, has avoided the brunt of the government shutdown impacts on airports. Unlike other Tennessee airports, like Nashville International Airport, long security lines and delays have been minimal.

Orlando International Airport is one of 40 airports having to reduce flights by ten percent because of the government shutdown.

This measure will affect travelers in several ways.