And there has to be availability under the code for the desired upgrade. We were booked in standard room at BC under 4/3 and couldn't upgrade unless we were willing to pay full price. Then I got lucky and found the CL room only deal for 35% off and got the deluxe CL level room I really wanted. It wasn't quite as good of a deal as the 4/3 but I am happy. Better view, bigger room, concierge floor access and guaranteed 2 queens with a daybed.