All flights from Europe to the United States have been suspended following technical problems with the US air traffic control system, European air traffic management body Eurocontrol said.
A spokeswoman for Eurocontrol said it was unclear when flights to the US could resume.
The US Federal Aviation Administration (FAA) halted all take-offs nationwide on Friday following communication problems, leaving tens of thousands of passengers stranded at airports.
US Homeland Security Secretary Markwayne Mullin said the suspension was a precautionary measure and warned it could take “some time” to lift.