Airports returning to normal after Northeast storm

Airlines said they were operating close-to-normal schedules on Sunday, a busy day for air travel.

Meanwhile, trains and public transportation networks were also struggling to get back to full operation in time for Monday morning's commute.

Boston's Logan Airport opened at 11 p.m. ET on Saturday, after closing in anticipation of the storm along with airports in New York City and Connecticut.

As of Sunday afternoon, Boston was still experiencing delayed and canceled flights and officials urged passengers to check with their airline before heading to the airport. Connecticut's Bradley International Airport opened early Sunday morning, also advising passengers to contact individual airlines about possible cancellations.

Flight-tracking website FlightAware.com said about 450 flights were canceled on Sunday, a busy travel day for airlines. Only 20 are expected for Monday.

In all roughly 5,700 flights have been canceled since Friday, when the airports shut down in anticipation of the storm. Friday saw the most cancelations, according to FlightAware, with Saturday a close second. Airlines waived ticket-change fees for passengers in the affected areas.

Airlines try to get ahead of big storms by canceling flights in advance. They want to avoid having crews and planes stuck in one area of the country. They also face fines for leaving passengers stuck on a plane for more than three hours, under a rule that went into effect in 2010.

Delta Air Lines Inc. said that as of Sunday morning, its flights were back to normal. In all, it canceled about 1,200 flights due to the storm.

United Airlines spokeswoman Megan McCarthy said the airline was operating at all airports Sunday, though it was experiencing some delays because of the weather. United is part of United Continental Holdings Inc.