BOSTON—A major winter storm that has brought some of the coldest temperatures of the season covered a large swath of the United States in snow as it wreaked havoc on air travel and caused slick road conditions throughout New England on Jan. 20.
Nearly 5,000 flights were canceled Sunday around the country, with Boston Logan Airport being one of the hardest hit, according to FlightAware, a flight tracking company. The National Weather Service issued winter storm warnings or advisories for part or all of at least 15 states stretching from southeast Missouri to the northern tip of Maine.
