From the latest weekly update.........

The MSP Training Center now contains cabin trainers for every aircraft in the Delta fleet and will provide one-stop shopping per se for crew training in MSP. Flight training in MSP will continue to be classroom and simulator instruction for pilots flying pre-merger Northwest aircraft such as the DC-9, A320/319, 757-200/-300 series, A330 - with an additional A330 simulator coming in the next few months, and 747-400.

That should help get some WB slots back to ATL.