Join Date: May 2004
Location: formerly Gold now Diamond, formerly MSY, now LAX, formerly NW, now DL
Programs: Hyatt Plat, Hilton Gold, SPG Gold, Delta Diamond/1MM
Posts: 4,725
I think if it's AF/KL ticketed, it has to be the higher classes YBM equivalent to use the upgrade certificates. Maybe there's a work around but I've learned best to do DL ticketed everything if you want to use the RUC/GUCs.