Sorry about the newbieness of this question, but I have never used stickers and am kind of confused what to expect with them. I have a 2-person domestic reservation with one PLT and one non-status passenger. Each leg of the trip requires 5 500-mile upgrade stickers for each passenger, so 10 each way. Right now, it's showing a 767-300 as the aircraft, so an upgrade to the new business seats with stickers would be great (mileage upgrade is too much with co-pay for a day flight). Right now, the PLT account has 12 stickers. I know that if we can upgrade on the first segment, we'll have enough stickers for that leg. However, if we get upgraded on the first segments, we'll be left with 2 stickers and will need 8 more to upgrade the return. Do we have to buy the 8 stickers before getting upgraded, or can we see that there's an upgrade available and then buy the stickers? Reason I ask is that I'd rather save $240 for later than for a possible upgrade. To make matters more complicated, both flights are rather close to each other, so the 72 hour windows overlap.