Not possible, backtracking in Asia is not allowed so SYD-BKK-HKG is illegal. You are allowed a transit without stopover Europe-Asia-Australia and the rules are ambiguous if a similar transit Australia-Asia-NA is allowed (the intent is to not allow it but the rules are ambiguously written and some have managed to ticket that routing, some have failed). In your case you have 3 options: move all the Asia sectors to be after SYD (this is then 100% legal); try for the ambigous booking (then becomes SYD-HKG-YVR, dropping SYD-BKK); book SYD-LAX instead (again 100% legal, dropping 2nd transit through Asia). As for CAI prices, they are higher now and Warsaw is possibly more attractive. I bet the WAW prices go up in January 2005 though.