Originally Posted by
nancypants
...anyone think of any events or similar that may account for the whole cabin just not being sold for that specific segment?
Don't know if QF ever does it but I have run into F cabin being closed on other airlines for 1 sector due to shortage of cabin staff at that duty station. I once had involuntary downgrade due to this, but they let me sit in the otherwise empty F cabin but with J service (and got the refund for fare difference).