By Zach Vasile

Thousands of flights have been canceled or delayed in the wake of a major winter storm that dropped heavy snow and ice across much of the country over the weekend.

According to tracking website FlightAware, about 3,900 flights to, from, and within the U.S. had been canceled as of Monday morning, and around 1,800 were delayed.

The storm’s impact was still being felt in the Northeast, where snow continued to fall into late Sunday night. 298 flights were canceled at Boston Logan, amounting to 60% of the airport’s daily schedule. Just under half of all flights were cut at New York-JFK, LaGuardia, and Newark, New Jersey.

Significant disruptions were also reported at Dallas/Fort Worth, Charlotte, North Carolina, Washington National, Washington Dulles, Nashville, Tennessee, Philadelphia, Raleigh-Durham, North Carolina, Austin, Texas, Pittsburgh, and Dallas Love Field.

Cleanup and recovery efforts have been complicated by bone-chilling cold. In parts of the Midwest, temperatures dropped well below zero.

The massive storm is estimated to have affected approximately 245 million people, from New Mexico to Maine. At its peak on Sunday, about 12,000 flights were canceled across the U.S., the highest number for a single day since the COVID-19 pandemic, according to aviation analytics company Cirium.