Originally Posted by SkyMilesInsider

With the Choice Benefits, SWU usage on day of departure does not require Z class inventory. If there is Z class available, you will be able to confirm your upgrade at booking. If it is not available, you will be placed on the waitlist. On the day of departure, provided there is an available seat in the premium cabin and you are booked in the appropriate fare class, we will clear anyone wishing to redeem their SWU for an upgrade. As far as the # of Choice Benefits, a status change will trigger the Choice Benefit. If your status changes to Platinum, you will be able to select one; if your status changes to Diamond, you will be able to select two. If you start out as Diamond and requalify (meaning no status change), you can select two.