Are you sure?

I look at tomorrow for example. UA 1570 is the 835am SFO-ORD.

F is booked full. 3 are cleared upgrades and only one name appears on the list (LOW/M).

J is booked to 45 out of 52 with 6 blocked (coach is probably overbooked). 30 of these are upgrades. The flight is currently checked in to 29. "LOW/M" is an upgrade to J.

Surely not all 29 of the check-ins are CPU customers. So why isn't the F waiting list longer? And why is LOW/M, who shows as cleared on the J list showing up as standby on the F list even though he's a revenue customer. I suppose it's technically possible there are two different "LOW/M" on the flight (one upgraded to business and one paid for business). But definitely the standby list for F would be longer with 29 business pax checked in.

I'm not losing sleep over this data. I'm just curious who really gets to show up on the F standby list.

Thanks!
-RM