I tried to put together a 4 continent itn. Not sure about the transcon rules in AUS / USA, could some of you experts please comment is this valid? I know there're many same kind of posts but wasn't able to find clear info with a few searches.

I suppose LHR-SYD and HKG-NYC are counted as 1 segment because it's the same flight number in both cases?

CAI-LHR-IST-LHR(-BKK)-SYD-AKL-MEL-PER-SIN-NRT-HKG-DEL-HKG(-YVR)-NYC-LAX-HNL-SFO-ORD-LAX-LHR-CAI

Cheers