Air travel is struggling as the government shutdown causes hassles and uncertainty for travelers, disruptions for airlines and even less wiggle room to recover from problems.

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.

Newark Liberty, JFK, LaGuardia and Teterboro were listed among the 40 “high volume market” airports that will be affected by flight cancellations as part of Transportation Secretary Sean Duffy’s pledge to keep American travelers safe in the sky, CBS News reported.

The White House official stated: You will see mass chaos. You will see mass flight delays. You will see mass cancellations. And you may see us close certain parts of the airspace because we just cannot manage it because we don’t have the air traffic controllers.

YEAH, THAT’S RIGHT MARY, YOU KNOW, A LOT OF TRAVELERS ALREADY FEELING THE FALLOUT OF THESE FLIGHT REDUCTIONS. AND LOOK AT THE BOARD. I MEAN, EVEN TODAY, LOGAN HAD NEARLY 50 CANCELLATIONS AND 500 DELAYS.

Anna Marie Hopkins, who is trying to fly to Rome, Italy, to celebrate her 50th birthday, described her airport experience amid mass delays and cancellations stemming from the government shutdown. CBS News national correspondent Meg Oliver has more.

U.S. airlines canceled more than 2,100 flights on Sunday as Transportation Secretary Sean Duffy warned that air traffic across the nation could "slow to a trickle" if the federal government shutdown lingers into the busy Thanksgiving travel holiday season.

Mass flight cancellations are set to start Friday due to strains from the federal government shutdown. Here's how airlines are responding.