On the same topic- I have 2 F tickets booked at the end of November WRO-FRA-SIN-SYD. We tried to make a small adjustment to the outbound and there is almost NO F availability in Nov/Dec 2022! Almost Every day is F0A0 (thought we'd have more flexibility since our flights are in booked in F). At first I thought the FRA-SIN was a candidate to be downgraded from the 748. But seems like all flights are simply fully booked in premium classes

Hoping something changes