More than 1,000 flights to, from, or within the US were cancelled on Saturday after airlines were told this week to cut traffic during the federal government shutdown, BBC reported.

Nearly 4,000 flights were also delayed, down from over 7,000 delays on Friday, according to flight tracker FlightAware. 

The Federal Aviation Administration (FAA) announced earlier in the week that it would be reducing air travel capacity by up to10% at 40 of the nation's busiest airports as air traffic controllers, who are working without pay during the shutdown, report fatigue, according to BBC.