I left ATL last night, no real problems, though I had noticed some weirdness in the app that was probably unrelated (had some minor IROPS and my re-issued flights weren't showing correctly in the app). Flying back DUB-ATL on friday. kinda wishing I had booked through AF now :|
The app was working fine for me about four or five hours ago.
Now you don't see lines at MSP and the rumor is that DL agents are taking passengers to some other location to check in. Really--that's what I heard.
ADDED: Airport kiosks and OLCI are supposedly back up now, but flights can't leave.