Except for all the Premier members(excluding 1K) who got re-booked with full-fare Y/B/M due to IRROPs. When the agents secure their seats, they have to re-book them in full fare Y. Don't forget some folks who are late for their flight, but re-booked for the next flight out in full fare Y as well because they are premier members.

Funny thing is, you don't know how many got re-booked because of IRROPs. If there are 100 people ahead of you on the list, we always think all of them got re-booked in full Y, don't we?

Verdict: You won't notice that, but I am sure you will upon the door closing and your name isn't called while sitting at the back of the bus. 1-5 Premiers who got re-booked, then you are easily screwed.