Thousands of flights have been grounded by a severe winter storm pushing its way across the US.


At least six people have been killed and thousands of passengers stranded at airports as they tried to travel home for the holidays.


The snowstorm, which spawned tornadoes in the south, has brought snow to the Midwest and threatens disruption in the East. Weather warnings are in place from Florida and the Gulf Coast all the way up to New England.


According to FlightAware.com, more than 360 flights have already been cancelled today (Thursday), in addition to about 1,780 flights cancelled on Wednesday.


Most of Wednesday’s cancellations were in Indianapolis, Dallas-Fort Worth, Chicago, Washington Dulles, New York’s LaGuardia and Cleveland.


American Airlines canceled 500 flights on Wednesday, spokesman Matt Miller told CNN.


About 375 of those flights were at Dallas Fort Worth International Airport, where more than 1,000 passengers spent Christmas night after their Tuesday flights were called off, CNN affiliate WFAA reported.


“(Tuesday’s) rapid snowfall, ice and winds required us to implement a deicing program and severely hampered our ability to safely service aircraft as we normally would,” airport spokeswoman Cynthia Vega told the station.


Philadelphia International Airport had some arrival delays of more than four hours on Wednesday, the Federal Aviation Administration said.