Originally Posted by
anabolism
Are you sure? My impression was that LFBUs were offered when more seats were available than needed for elite/mileage upgrades, while advertised upgrades were often done in an oversold situation, and also that LFBUs were kiosk-only, for both domestic and international flights, while advertised upgrades were out-station only (for flights to the U.S.)
But an op-up or other upgrade during irrops is very different from a kiosk or advertised upgrade.
The advertised upgrades at outstations work the same as when a kiosk offers the upgrade domestically. What
gemac and I are trying to say is that if you have already upgraded and are booked in C class, you won't be able to use the LFBU to get to the F cabin - regardless of a machine or an agent being involved. Double upgrades, except in rare circumstances (old miles come to mind) are not allowed.