ATL is currently RED on that map, meaning arrival and departure delays exceeding 45 minutes.

BTW, I think DL might be rationing flights into NYC. From MSP, I noticed that the afternoon departures to EWR have posted delays, while flights to LGA with late morning departures are delayed about an hour while afternoon flights are still posted as being on time. This would make sense since more buiness travelers want LGA than EWR. [Depite what local media are saying, the early morning flights were on time into both LGA and EWR.]