Originally Posted by BrianDromey

You’re right, to a point. For reference the current layout is
14F/56J/44W/183Y. My guess is that BA will oversell W and Y in the interim, if the 77W makes sense overall. W could be fertile ground for upgrades on SIN-SYD, for example. The other option would be 4 class 772s, but if cargo is important the 77W is a monster. For SIN and HKG they might decide to send two 77Ws instead of a 77W/A380 combination which would reign the F and J numbers back a bit. 173J between the 77w and A380 seems a heck of a lot for any destination served twice daily.

BA do have a lot of options, the later A350s might get the rumoured 4 class layout or routes might see F dropped. Sin-SYD could go A350, for example. Some routes will have to loose F as 3 class A350s come to replace the 4 class 747s. It won’t be many though - I don’t think any 777s are loosing F during the CS refit?