About a dozen planes had landed at Logan International Airport, and several had been reloaded with passengers and taken off again, by 9:30 a.m. Sunday. The airport had one runway open and was prepared to open a second when demand warranted. “The airlines are telling us they expect to be back at full operation by the end of the day,” said Matthew Brelis, spokesman for the Massachusetts Port Authority, which runs Logan.

Logan closed overnight Friday into Saturday as whiteout conditions forced crews to stop clearing the airfield, and wasn’t able to reopen until 11 p.m. on Saturday – the longest the airport has been closed in at least 10 years. Across the country, more than 6,600 flights were canceled on Friday and Saturday, according to FlightStats, and hundreds more are expected today.