When I flew SIN to SYD and SYD to SIN in March on QF2/1 I wasn’t successful with either flight in an upgrade from Y to J (QF plat). When I looked the A330 flights went out with J seats free. I now need to fly LHR - SIN (stop) - SYD and then return with a stop in SIN again. I’m booking multi city and this is over Xmas/NY. I always think the A380 has more chance or do people think book the A330 flights?