Delta has established a dedicated line to assist customers with checked luggage that was impacted by the Atlanta airport power outage. Customers (including Air France-KLM customers) should call 1-888-977-1005 to arrange for baggage delivery.  Due to congestion, customers are encouraged to call the dedicated baggage line for assistance rather than going to an airport baggage service office.

Also, Delta customers flying to, from or though Atlanta through 12/19 can make a one-time change to their travel plans without a fee. Details are available here