Starting Friday, Orlando International Airport must reduce flights under a new FAA emergency order aimed at easing stress on air traffic control.

Passengers can expect average delays of nearly three hours, the FAA said, warning that at some point all flights into Florida’s busiest airport could be halted.

The Federal Aviation Administration and the transportation secretary have announced a reduction in air traffic at 40 U.S. airports as the government shutdown continues.The Orlando International Airport (MCO) was included among the 40 airports.

At this time, MCO is seeing only a few delays and cancellations, partially due to weather elsewhere in the country, an airport spokesperson said.

Other major airports, including Dallas/Fort Worth (DFW) and Ronald Reagan Washington National Airport (DCA), have experienced major delays as well.

As Americans prepare for Thanksgiving holiday travel, the government shutdown is likely to result in more airport delays due to a shortage of air traffic controllers.

The FAA will reduce air traffic by 10% across 40 major markets starting Friday due to staffing shortages during the government shutdown.