I hate to say but I am a bit confused. The LHR - PHX route went to the A350 for S'21 however within a few weeks scheduling the A350 BA changed the route back to 77W which includes F of course. I was scheduled late September '21 into first week of October and my flight was "cancelled" due to no F on A350. I had to reschedule to late October into first week of November, outbound on A350 to check out the new Club seat, back on 77W in F as the route changes back to 77W for W'21. This route now has 777 for most of S21 but switches back to A350 for roughly 3-4 weeks in October '21. Both BA Routesonline and BA Source has not kept up with any route / aircraft changes, in part possibly because changes are so frequent I am guessing? Is there a Flyertalk thread more dedicated just to route / aircraft changes? I posed my question and confusion to this thread as the PHX route had been switched to the A350 but now appears to make only a brief appearance October '21.