having nonrevs in the Business cabin would also limit the number of upgrade opportunities for paying pax, as well!
No it won't... upgrades would be given to revenue passengers first- whether people believe it or not, rev. first, then non-rev.
pilots flying in first cabin when there were empty seats in economy, and I had been told at check-in that there weren't seats available for upgrade.
What happens often also is that F may be full at "check-in" but at the "cut-off" point, the seats are released back into the system (who hasn't checked in) and it's fair game for whomever is on the upgrade/non-rev list. When flying AA
(if you are either G, PL
), asked to be placed on the UPG list regardless, so if something opens up, it's all yours.