I hit Plat three weeks ago. It first showed up under Account Summary. After that, I tried to update my information on a coming itinerary by doing it on nwa.com. However, no matter how I tried(delete it first, then add it; or first change it to non-elite DL skymiles number, then change back), the system kept remembering me as a GE(I was even listed as GE when I used the DL non-elite skymiles number). I ended up calling elite line and asked the agent to do it for me. So my experience told me that you would have to call.

There might be a third computer system on NW---the weekly email I got last week from NW still listed me as GE; but this week it changed to PE.