Originally Posted by peteropny

As stated in the FAQs sticky above



Some clarification since you are inquiring about the usage with pre-paid rates: Yes that rate is an "eligible" rate for upgrade - it's better that you call and inquire about the application and book at the same time since the inventory may not be available and you can postpone booking (and paying) for the stay - rates may fluctuate but tends to rise as the hotel fills up.