Airlines are canceling hundreds of flights to comply with the FAA's order. But there are still questions about the plan, which the agency says will keep the skies safe during the government shutdown.

The delays and cancellations are likely to get worse as airlines are increasingly unable to reposition planes, pilots and flight attendants due to the air traffic controller shortage. Government shutdown The AP has journalists around the country covering the shutdown of the federal government. What questions do you have for them?

As of 10 p.m. ET on Sunday, more than 10,000 flights within, into, or out of the United States had been delayed, according to FlightAware.

An advisory on the Federal Aviation Administration website that tracks flight delays across the US warns that those times are "increasing" in Newark.

Donald Trump gloated about the Air Force One pilots who flew him from Palm Beach back to D.C. as travelers across the U.S. were stranded by thousands of flight cancellations. The president was in high spirits after Air Force One performed a flyover of Northwest Stadium in Maryland Sunday afternoon as he arrived from Florida to attend a Washington Commanders game.

Follow live updates on delays, cancellations and FAA impacts as airlines cut flights amid the government shutdown.

The government shutdown has triggered 1,000-plus flight delays as the FAA cuts capacity at 40 airports. Airlines are offering refunds and policy changes amid ongoing travel disruptions.