AMS = KLM, KLM = AMS. If you are AMS based and you want results aka want to be upgraded you don't waste time with anything called 'Delta' on the DoD.
Honey Badger Don't Give a ....! if you are A DM 360 MM Corporate traveler with a Delta reserve CC waitlisted for 2 months already currently in transit from PRG to AMS.
They are however very efficient upgrading anyone approaching them if they see the inventory @ Z=6 on a DL flight.
3 minutes after you appear you will have that upgrade. No need to bother with Delta, or such nonsense as waitinglists.