Airports in Toronto and Montreal declare ground stops after the FAA issued a nationwide stop in the US

Airports in Canada have warned of sweeping flight disruptions amid the air traffic control outage in the US.

NAV CANADA, a privately run nonprofit corporation that owns and operates Canada’s civil air traffic system, said Friday night that its systems are “operating normally” and that it issued ground stops to “safely manage traffic volumes.”

“Travellers should expect delays and check with their airline,” it said on X.

Mark Stephens, a retired Delta Air Lines pilot, told Business Insider that the airports may be preparing for US-bound international flights that need to divert.

He added that the planes on the ground at the airports will return to their gates, meaning traffic management will be imperative to handle the potential increase in volume.

As of 6:20 pm Eastern time, more than 2,700 flights have been canceled within, to, or out of the US, according to FlightAware.com. Another 10,500 have been delayed.

Cirium, an aviation analytics company, said at least 600 flights have been diverted so far on Friday, with airports like Denver, Chicago, Los Angeles, and Cleveland taking on additional flights.