Dozens of flights to and from London's Heathrow airport were cancelled on Thursday ahead of Arctic weather expected in Britain.
The National Air Traffic Services service is expected to restrict flight arrivals from 3 pm local time in order to allow ground teams to remove snow from the taxiways and runways at Europe's busiest airport. Other delays can result from the need for planes to be de-iced. Passengers were told to check the status of their flights.