Flying DTW-AMS-MUC next Monday (A330, F70). Ticket was booked as a Y fare, so I was able to burn 15,000 miles for the WBC upgrade on the outbound, no availability on the return. Phone agent put me in a window per my request, and even got me row 3 on the KLM Fokker 70. I went online and had some trouble finding my reservation. When I did, noticed that the seatmap showed all of row 1 open, but would not allow me to select the Premium seat. Thats when I realized my Worldperks number did not make it in the reservation - flight was booked through our corporate online system as a KLM flight, so it was not smart enough to use my NW number. Added the number and moved up to 1A per seatguru's info. I'm wondering now if I missed availability on the return if the system was not seeing me as silver elite.

Today I just noticed I was moved to 4B and 1A is taken. Also looks like I was moved farther back on the return, but still in the front 1/2 of the plane. Not a big deal as I was able to grab 1J and any WBC on the A330 is far better than coach, but kind of strange.

Can paid F bump an upgrade? Platinum trump my silver? Just curious why changes happend as there was no equipment change and still many seats open, at least on the seat maps.