From my experience getting "A" class is most difficult on JL among OW carriers. It was such a PITA to get them. Not only on the new 777 aircraft with the F suites, but the 744s on long haul and short haul are also difficult. Luckily for us we were able to get two "A" seats confirmed each on HKG-NRT & NRT-LAX on our AONE3 trip last month with NRT-LAX cleared from the waitlist. At least on QF, "A" class has reasonable availability on the 744 flights.