Can anyone explain the set of conditions in Hyatt's booking flow which indicate that a suite is available for upgrade via a Diamond Suite Upgrade? I know step 1 is to determine into which level of suite the particular hotel books these upgrades. Beyond that, is it enough for this suite to be available for booking via the Hyatt booking flow through any rate type? Or does the suite need to be bookable by the Hyatt daily rate or the Advance Purchase rate specifically?