New York's LaGuardia Airport has reportedly issued a ground stop after severe weather tore through the Big Apple on Monday night. The stoppage comes as the government shutdown caused thousands of passengers to miss their flights due to a lack of air traffic controllers.

Air traffic in the U.S. could “slow to a trickle” if the federal government shutdown lingers into the busy Thanksgiving travel holiday season, Transportation Secretary Sean Duffy warned Sunday.

The FAA mandatory reduction in-service increases to 6% of flights at the nations busiest airports, prompting airlines to cancel hundreds of flights.

The flight cancellations at airports across the U.S. are expected to persist even after the government shutdown ends.