Winter Storm Pax is not just wreaking havoc on the ground in the eastern United States. About 6,000 flights have been canceled and another 1,500 were delayed as of Thursday afternoon.

The hardest hit airport was Charlotte Douglas International Airport in North Carolina, which had 525 canceled flights (69 percent of all flights) as of 12:15 p.m Thursday EST, according to Another 80 flights, or 10 percent of all flights, at Charlotte Douglas, were delayed. About 4 ½ inches of snow was on the ground in Charlotte as of late Thursday morning, according to the Weather Channel.

Also in North Carolina, Raleigh-Durham International Airport had 125 flights delayed, or 64 percent of all flights.

Atlanta, which was blindsided by a snowstorm late last month that led many motorists to abandon their cars on highways, is another city reeling from the effects of Winter Storm Pax. Hartfield-Jackson International Airport had 425 flights canceled, or 35 percent of all flights, as of Thursday afternoon. Another 19 flights were delayed.

Philadelphia International Airport, where 8.8 inches of snow was recorded late Thursday morning, had 425 flights canceled (72 percent of all flights) and another 20 flights delayed.

Also in the Northeast, Newark International Airport had the fourth-most amount of cancelations in the country, with 356. Newark, which is also forecast to see 4 to 8 inches of snow by Thursday night, also had an additional 15 flights canceled.

Not far behind Newark is Reagan National Airport in Washington, D.C., which had 355 flights (80 percent of all flights) canceled as of Thursday afternoon. Another four flights were canceled. Nearby Baltimore-Washington International Airport had 243 canceled flights, while another D.C. airport, Washington Dulles International, reported 274 canceled flights. Snow was pummeling the D.C. area, with more than a foot of the white stuff recorded in the nation’s capital.

Other Northeast Airports had fewer percentages of canceled flights. But they still had more than 100 flights canceled, including New York’s John F. Kennedy International (168 flights -- 30 percent), LaGuardia Airport (327 flights -- 58 percent), and Boston’s Logan International Airport, which had 139 flights (29 percent) canceled.

In terms of airlines, Delta experienced the most cancelations with 738, or 30 percent of all flights, according to data from FlightAware. That was followed by Southwest Airlines with 595 cancelations and US Airways with 527 canceled flights. ExpressJet had the fourth-highest amount of cancelations with 511.

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