ATLANTA, Ga. (Atlanta News First) - Flight cancellations and delays mounted at Hartsfield-Jackson Atlanta International Airport Sunday as federally required cuts continued amid the government shutdown.

As of 12 p.m., FlightAware is reporting that 320 flights have been cancelled and 356 have been delayed. Below is a breakdown of cancellations by airlines:

Delta & Delta Connection: 257

Southwest: 5

American & American Eagle: 5

JetBlue: 4

Frontier: 4

Spirit: 1

Air Canada: 1

Airlines are currently required to cut at least four percent of their flights. That requirement increases to six percent by Tuesday and 10 percent by Friday.

Transportation Secretary Sean Duffy said cancellations could climb to as much as 20 percent, although no formal plans have been made.

RELATED: FAA-man

See Full Page