Flight delays and cancellations are piling up Saturday across the U.S. after the Federal Aviation Administration cut flights at 40 U.S. airports on Friday.

The ongoing shutdown means that air traffic controllers at Denver International Airport have been working without pay, with many taking second jobs to try to make ends meet. Now, Colorado lawmakers are pushing for the Federal Aviation Administration to approve the airport's emergency waiver that would allow its air traffic controllers to be paid during the shutdown.

McGhee Tyson, the fastest-growing major airport in the United States last year, is not on the FAA's list of airports that will reduce flights. However, that doesn't mean Knoxville passengers are immune to the increasing flight cancellations.

Over 5,000 flights traveling into, out of and within the U.S. have been delayed as of this evening, according to FlightAware.com.

Blue Origin says it is working with the government to secure additional launch opportunities for the upcoming New Glenn launch of a NASA Mars mission.

Airlines are reducing flights starting Friday under a new FAA directive. Here’s how United, Southwest and American are handling it.

At least three major airlines have said international flights will not be reduced at the 40 airports where the FAA has ordered cuts.