Originally Posted by
percysmith
Is this for some US prime date or some other reason why your result is unrepresentative of year-round demand?
I don't know of any specific reason. One week earlier still has pairs of J seats available. I haven't looked at it that extensively, except when I'm wanting to fly. (And, in this case, I looked at it because friends were travelling.)
What I have noticed is that demand cycles between HKG and Aust are very different to that between HKG and the USA. So if you want to travel USA-Aust or v.v. and don't grab seats when they are available, there is a very much more significant risk of one end being available while the other isn't. (Sometimes you can get around that by having a stopover in HKG, though it is a pretty expensive place to waste a few days if you don't actually want to be there.)