Many people may be changing their holiday travel plans as they prepare for a winter storm to hit the East Coast Sunday.

Bad weather conditions are expected across the northeastern coast of the U.S., causing the mayors of Boston and Philadelphia to declare a snow emergency. 

CNN reports:

Delta Air Lines canceled 850 flights Sunday from the Carolinas through the northeast, roughly one-sixth of the typical 5,000 flight total for the day.

American Airlines has "canceled the majority of flights" from Washington, Philadelphia, New York and Boston from about 2 p.m. through Monday morning, according to airline spokeswoman Mary Sanderson.

As of late Sunday morning, Continental Airlines, which is partnered with United Airlines, had canceled about 265 domestic mainline and regional departures for Sunday, spokesman Andrew J. Ferraro said.

Amtrak canceled Sunday trips through Virginia on six trains that provide regularly scheduled service between Newport News, Richmond and Washington, D.C.

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