UA952 this Saturday:
six J seats open. PE is best as I can tell oversold. Y is sold out.

I reclassed my ticket (was M, paid for A, paid for Z) and am in J, but thinking about downclassing to A again and applying PP. Would end up #2 on the waitlist.

what are the chances of UA selling two last minute seats and at least two people taking a promotional upgrade at check-in?

Edit: A-class has now opened further. Was A1 this morning; now A4.
J6 JN6 C6 D6 Z6 ZN6 P5
O4 ON4 A4 R0
Y2 B2 M2 E2

If I interpret this correctly, they're oversold by two seats in PE.
They anticipate four clearing into J.
Two open seats in PE --> hence two Y-seats now open