Originally Posted by Globaliser

I suspect that "subject to capacity" includes (but is not limited to) "if the flight is full, we won't sell any".

Also, it would be consistent with past practice for "subject to capacity" not to mean "if there is any empty seat, we will sell one".

In any event, J7 doesn't tell you that there are empty seats in CW. It could be just as consistent with CW being full, but space being available in the F cabin. In that situation, you could understand why BA might not be keen to op-up someone from CW to F for the incremental revenue generated by selling one WT+ --> CW AUP.