WASHINGTON (AP) — Flights from the U.S. to Europe are being disrupted by clouds of ash from a volcano in Iceland.

Federal Aviation Administration spokeswoman Laura Brown said Thursday that airlines are canceling some flights to Europe and others are being delayed. Some flights were also returned to the U.S. last night.

Airports in Britain, Ireland and Nordic countries have been closed because ash from the volcano that erupted Wednesday makes flying too dangerous.

But flights to other destinations are also affected. Brown said the route for most flights from the East Coast to Europe crosses the North Atlantic near the ash cloud. Brown said the FAA and airlines are working to reroute some flights.

A spokesman for the Port Authority of New York and New Jersey, which operates New York’s three metro area airports, would not comment on flights and the impact of the air space closure on individual airlines.

The route between New York and London is the second busiest in the world, behind the route between Hong Kong and Taiwan.

British Airways spokesman John Lampl said the airline had several flights out of the U.S. bound for Heathrow that were returned to their destinations when London airports were closed. That includes flights from Chicago, San Francisco, Denver, Las Vegas and New York. Some passengers were being put up in hotels.

Some flights made it out of the U.S. late last night, but more were being canceled Thursday morning.

“This (closure) will domino into every airline,” Lampl said. “Everybody’s in the same boat.”

American Airlines canceled 21 flights that were scheduled to arrive at or depart from London after U.K. authorities closed the airspace, said airline spokesman Tim Smith. He said American was able to make six takeoffs and nine arrivals at Heathrow before the shutdown.

Smith said American flights to other points in Europe were not affected as of Thursday morning, Central time. He said passengers on the canceled U.K. flights were booked on later trips or given a refund.

At the British Airways Terminal at John F. Kennedy International Airport, William Phelps and family told a local radio station that they had decided to stay longer in New York after their flight to London’s Heathrow Airport was canceled.

“It’s the simplest thing for us,” he said. As for his children, he said they were fine with the change in plans. “They love New York, so that’s OK.”

Volcanic eruptions rarely interrupt commercial air travel, but in some large ash clouds high in the atmosphere have the potential to stall or shut down jet engines.

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