Air and rail passengers hoping to travel on Saturday are encountering yet another day of cancellations and delays as the nor’ester that snarled travel Friday is being followed by residual problems in transportation hubs all across the Northeast.

Airline officials say flight operations are slowly returning to normal as they deal with the backlog of passengers from thousands of canceled and delayed flights on Friday. There were more than 3,000 flights canceled and another 4,800 delayed, according to FlightAware.com, most with destinations or departures in the Northeast Corridor, where the nor’easter landed blows from Virginia to Maine.

[ At least six dead as nor’easter slams East Coast ]

The storm also disrupted service on the heavily used Amtrak rail service along the corridor. High winds fell trees along the electric-powered rail line between Washington and Boston on Friday, causing service disruptions and cancellations. Amtrak continued to work at getting full service back up Saturday morning, but it said service between Washington and New York was suspended until at least 9 a.m.

By 11 a.m. Amtrak said it had resumed service on modified schedules, but warned that “significant residual delays should be expected as work continues to restore full service following Winter Storm Riley.”

While winds in the D.C. area have calmed down enough to allow for the airports to return to normal operations, hundreds of flights were canceled Saturday morning, with most disruptions at hubs in Boston, New York and Philadelphia. On Saturday, airport officials in Washington urged travelers to check with airlines before heading to the airport.

The airlines still are working to accommodate passengers from canceled or delayed flights from Friday. In Washington, more than 300 flights were canceled Friday, but it was in New York, the East Coast’s primary transportation hub, where thousands of travelers left stranded, with more than 1,000 flights canceled at Newark Liberty International, LaGuardia and John F. Kennedy International airports.

[ ‘Pretty much everyone on the plane threw up’: Friday was a rough day to fly. ]

Many airlines waived change fees for flights for those affected. Travelers should check with their respective airlines. American, Delta, United and Southwest airlines — the four biggest carriers in the country — have flexible change policies for travel to the Northeast because of the storm.

“One thing we can’t control is the weather,” American Airlines spokesman Ross Feinstein said.

American canceled more than 1,600 flights in the Northeast on Friday. About 24 percent of the carrier’s global operations are being affected by the storm, Feinstein said. About 270 flights had been canceled Saturday, he said.

“We anticipate some residual delays” and cancellations on Saturday, he said.

United Airlines said it canceled more than 100 flights in the Northeast on Friday and was operating on a reduced schedule through the afternoon. Delta said it canceled 750 flights to and from the Northeast on Friday and that more disruptions were possible.