I booked through the AMEX portal about a week and a half ago with the "vanilla" platinum since I already hit the$60k with AMEX Reserve and the ticket issued did not have a C+ "upgrade" which typically occurs after booking, I waited a couple of days and then realized that AMEX did not have my Skymiles # added to the reservation even though it's in my AMEX profile and Delta's system did not pick up on it either but I cleared for the C+ "upgrade". This forum reminded me to use my RUCs and I am now cleared in F from OAK-SLC-ORD and back. See some of you at the conference!!!