Reuters published this article:

Airline cancellations topped 5,700 U.S. flights on Friday as massive winter storms snarled airport operations around the United States and frustrated tens of thousands of holiday travelers.

That followed nearly 2,700 canceled flights on Thursday, while just over 1,000 flights have already been canceled for Saturday, according to flight tracking website Flight Aware.

Passenger railroad Amtrak has canceled dozens of trains through Christmas, disrupting holiday travel for thousands.

Highways in the Midwest faced lengthy delays because of snowy weather or crashes and authorities in parts of Indiana, Michigan, New York and Ohio urged motorists to avoid nonessential travel.

The Federal Aviation Administration (FAA) imposed ground stops or delays for de-icing at a number of U.S. airports because of winter weather.

Transportation Secretary Pete Buttigieg told CNN the U.S. aviation system "is operating under enormous strain" with two different storms and high winds affecting airports around the country. About 10% of U.S. flights were canceled on Thursday, Buttigieg said.