I realize that there are priorities everywhere -- Plat - Gold - Silver -- etc
and even on the "waitlist".

Maybe someone with some knowledge might be able to elaborate on the waitlist prioritization --
1. PA
2. PB
3. PC
4. PD
I understand (?) PA is the highest priority --but that it drops at the 72hr mark (International Upgrade) yet PD remains and is upgradeable at the airport -- at least that is what was told to me.

Wouldn't it be nice to change your priority code 73hrs prior from PA to PD???? (If we only could).