I apologize that I haven't read through the entire thread, only the last couple of pages and the wiki, and I'm not sure if this is the right place to ask, but here goes: I have a confirmed upgrade to domestic F using PPs. What happens if the flight is canceled for weather related reasons (snow forecast at the arrival airport)? Do I get re- accommodated in F on the new flight I'm booked on even if no PZ space is available? Or do I lose the upgrade and the points get re-deposited?