Heavy snow and ice led to thousands of flight cancellations across the country as the ripple effects of the storm trickled through the airline networks. Airlines cancelled nearly half of all flights into and out of Atlanta on Friday, according to airline tracking company FlightAware. Atlanta is home to the world’s busiest commercial airport.

A potent winter storm is hammering the South with snow and ice, causing major travel disruptions and power outages just a day after it walloped the Plains.

A winter storm in the South brought heavy snowfall Friday, causing thousands of flight cancellations and several governors to declare states of emergency. More than 46 million people were under a winter storm warning Friday,