I am pretty sure that their will be no flight to DFW operated by KLM.
its indeed flown by NW which is the partner of KLM as you know. I even believe that the DFW-AMS flight of NW is classified as a direct flight even though their is one stop in MSP.
its operated under the same flight number.
if their ever will be a AMS-DFW flight by KLM it most likely be operated with an 747-400 or the MD11.