Toronto Pearson Airport says the FAA ground stop is affecting flights between Toronto and the United States, and that no US-bound departures or arrivals are currently scheduled.
In a statement reported by Yahoo News Canada, the airport said on Friday: "There are currently no scheduled U.S.-bound departures or arrivals at this time."
Billy Bishop Toronto City Airport is advising passengers to contact their airlines.
NAV Canada, which runs air navigation in Canadian airspace, said it is closely monitoring the ground stop. In a post on X it said: "We continue to support the safe movement of air traffic in our airspace, including any aircraft that may be diverted."
This is the first on-record confirmation of the ground stop's effect on cross-border traffic, and of a neighbouring air navigation service handling aircraft diverted away from US airports. Neither statement gives a figure for the number of flights affected or an estimate of when US-bound services might resume.