More than 1,300 flights have been canceled and nearly 3,500 have been delayed across the United States Sunday, according to data from FlightAware.

Airports across the Northeast are seeing the majority of the disruptions, as thunderstorms hit the region throughout the day, according to the Federal Aviation Administration.

New Jersey's Newark Liberty International Airport is experiencing the most significant cancellations, with 355 flights being canceled and 299 flights experiencing delays, according to FlightAware.

This is a developing story. Please check back for updates.