ATL-PVG isn't coming back anytime soon. It would canabalize DTW-PVG and both routes would suffer.
Keep in mind I think just about every airline has deffered China routes that they fought so hard to acquire in recent years.
AA ORD-PEK
US PHL-PEK
UA SFO-CAN
It is not the boom town that everyone once thought for all the proposed new service.