First time flying with CX, so I would be grateful to have my expectations set realistic...
Snatched a good premium eco fare to HKG from Europe for end of April and I am interested in mile-upgrading LHR-HKG (wishful thinking ) with Asia Miles, I was told by the CX hotline, that an upgrade to C would cost 25k oneway (which is fine), but there is no availability at the moment...
Give that I have no experience with CX, is it even realistic that some inventory will open up and if so, is there some pattern (weeks before, lastminute..etc) of I should just check every day..

Thanks