Originally Posted by
Gardyloo
I believe you will find that you won't be allowed to transit Asia en route to Sydney. Interpretation of the "second Asia entry" rule clause by the airlines has limited its applicability only to Europe < > Oz/NZ routes, not N. America or Africa < > Oz/NZ. ...
FWIW, the on line tool allows such routings. e.g. LHR-SIN-SYD-xNRT-LAX-LHR is deemed "valid" and ticketable.