ATLANTA, Ga. (Atlanta News First) — Airlines are delaying and canceling flights as a massive ice storm closes in on north Georgia this weekend — including at the world’s busiest airport.

Hartsfield-Jackson Atlanta International Airport officials said they are treating the runways, but several flights are still being called off. Nearly all of metro Atlanta is under an ice storm warning, and heavy snow and ice in other states are keeping planes from coming to the city.

FULL FORECAST: Freezing rain, ice to develop tonight in north Georgia

As of 6:30 a.m. Sunday, here are the numbers for ATL and airports nationwide, as per FlightAware:

Saturday flights canceled, delayed:

ATL flights canceled: 300

ATL fights delayed: 320

National flights canceled: 4,589

National flights delayed: 18,441

Sunday flights canceled, delayed:

ATL flights canceled: 1,042

ATL fights delayed: 31

National flights canceled: 10,154

National flights delayed: 7,756

The Atlanta-based Delta Air Lines is letting travelers change their flights for free until Jan. 28. Click here to learn more.

More ice storm coverage:

LIVE UPDATES: Winter ice storm set to move in this evening | First Alert Weather

FULL LIST: School districts close Monday ahead of ice storm

GEMA warns historic ice storm could bring widespread power outages

Hartsfield-Jackson airport officials share winter storm preparation plans

Why ice storms threaten north Georgia and Atlanta; the science behind this event

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