Yep. They've been going since maybe 1:30 this afternoon. The issue is deicing is relatively slow in ATL... maybe 45 minutes a plane. Looks like they've canceled a bunch of flights that extend into the 10p push.

Here are the current stats for ATL:
DL has cancelled 45% of the flights, 35% are delayed.
Endeavor: 95% cancelled, 4% delayed
WN cancelled 88%, 4% delayed.
UA cancelled 65%, 12% delayed
AA cancelled 72%, 5% delayed
Frontier cancelled everything today.