Sunday delivered the sharpest travel disruption since the US government shutdown began, with more than 2,800 flights canceled and over 10,000 delayed, according to the FlightAware tracking site.

Major airports in New York, Chicago, and Atlanta were hit the hardest, with Atlanta’s main airport canceling more than 200 flights.

Airlines for America, which represents major US carriers, said more than 4 million passengers have been affected since the beginning of October, the Washington Post reported.

Transportation Secretary Sean P Duffy warned Sunday that the shutdown’s impact on US airports “will only get worse” and could stretch into the holiday season. He said thousands more flights will likely be canceled as air traffic controllers work without pay, and some begin seeking other jobs to

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