Air carriers began canceling flights Saturday, ahead of the storm, in an effort to avoid stranding passengers at airports as much as possible.
Blizzard warnings stretched from New Jersey to Maine. Up to 20 inches (50 centimeters) of snow were expected in Philadelphia and Boston and up to 16 inches (41 centimeters) in New York City.
Delta Airlines, which has canceled 850 flights, says it expects some cancellations tomorrow as the storm moves through the Northeast, but a spokesman said that was still being determined.
"We expect there will be cancellations in the Northeast, including New York and Boston, through the morning tomorrow," Kent Landers, Delta spokesman, said. "As we get into the afternoon and certainly by Tuesday morning we are aiming to resume normal operations throughout the East Coast."
A spokesman for United Airlines, which canceled 110 flights Sunday, said it could add more flights Monday to accommodate stranded passengers, but final decisions were due later in the evening.
Continental said it had canceled 265 mainline and regional flights Sunday and said only that it continues to monitor the storm.
"We are continuing to monitor the storm's progress and its potential impact on the operation," said spokesman Andrew J. Ferraro.
U.S. Airways began canceling flights Saturday evening and canceled more Sunday for a total of 679 mainline and regional express flights. It canceled 110 Monday flights, mainly in Northeast cities including Philadelphia, New York and Boston.
The earlier cancellations were being done to try to avoid both passengers and crews getting stranded at airports, said spokesman Jim Olson.
American Airlines continued 262 flights Sunday and spokeswoman Mary Sanderson said she expected more flights to be canceled through 10 a.m. tomorrow morning. The air carrier is working on rerouting or rebooking as many customers as possible.