Flight delays and cancellations are piling up Sunday across the U.S. after the Federal Aviation Administration cut flights at 40 U.S. airports on Friday following a monthlong government shutdown.

As the government shutdown continues, more challenges await passengers as they deal with the Trump administration’s announcement of a 10 percent cut in flights at 40 U.S. airports.

Analysts warn that the upheaval will intensify and be felt far beyond air travel if the cancellations pick up and move closer to the Thanksgiving holiday.