LOS ANGELES, California — A powerful nor’easter is slamming east coast cities from eastern Pennsylvania to most of New England, causing power outages and affecting flights across the U.S.

Flights from Los Angeles International Airport have been compromised by the strong winter storm with 40 canceled flights and nearly 20 others delayed. Travelers and those who are expecting visitors from Boston, Philadelphia,  New Jersey or New York are advised to check with their airlines to see if their flights have been affected.

Most airlines are accommodating travelers who have been impacted by the nor’easter by waiving change fees and some are even offering refunds for canceled flights.

Almost 1,900 flights have been canceled nationwide, with Newark Liberty International Airport in New Jersey counting for over 40 percent of those flights. Airlines have already begun to cancel flights Thursday in the U.S.

Damaging winds, heavy rain, and pounding snow are all in the forecast for various northeast and east coast cities. School districts have announced closures while Amtrak canceled some train services in heavily affected areas.