Originally Posted by
henners
Not necessarily - I've been op-upped onboard to F (nb, I was not on the OP's flight!). No idea what caused them to have to move a lady to my seat, but when we passed on the stairs she seemed happy, so I assume she was an op-up from WTP.
But it sounds like no-one moved into the upgradee's seat in the OP's case, which suggests to me that it wasn't an "op-up due to a full cabin" as such, more like a FoC upgrade for whatever reason (maybe broken seat etc).