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More than 3,000 flights have been cancelled in the US amid the second major severe winter storm to hit the region so far this year.
More than a foot of snow hit parts of the region forcing up to 900 more flights to be cancelled today (Wednesday).
Passengers on transatlantic services to and from the US faced the prospect of delays and cancellations.
Temperatures across the eastern US were expected to be 10 to 25 degrees colder than average yesterday and today, according to the US National Weather Service.
Snow and ice stretched for 1,000 miles from Kentucky to Massachusetts on Tuesday, slowing traffic and prompting winter storm warnings.
British Airways cancelled three flights from Heathrow to New York JFK and one to Newark today.
Virgin Atlantic said: “Due to the approach of heavy snow some of our flights to New York on Tuesday 21 and Wednesday 22 January have been cancelled.”
Snow was reported to be 10 to 14 inches deep in Philadelphia, 12 inches in New York City and up to 10 inches in Washington.
Parts of Minnesota, Vermont, New Hampshire and Maine were under wind chill warnings, meaning wind chills could be 34 degrees below zero or colder.