I took this flight return HKG- CDG- HKG late Aug/ early Sep earlier this year. F class 6/6 full both sectors. I used BUD both ways (paid combo I/ D Biz class); unsure if others were using miles or BUDs or cash. J class also very full. So I'm surprised by aircraft change. Maybe winter bookings aren't as robust? Or maybe the Aria Suites retrofit requires some sort of reshuffling?