They could have avoided the delay and stopover in Atlanta by just canceling your flight instead. They found a solution to get you there, albeit later than planned.

Listen, it's frustrating, I know. Especially when the ATC issues aren't even in your route of travel. But the east cost was a mess yesterday and DL has major hubs there.

I, for one, spent several hours on a diverted plane on the tarmac in Boston yesterday flying from Europe to NYC because of the storms. It happens.