Originally Posted by
satprof
Can't help with the MRU end but my understanding is that it would be valid if one or other of the HKG transits were to be a 'transit with no stopover'. (If that were the case, you might as well go jfk-syd-hkg-jnb-mru or jfk-hkg-syd-jnb-mru, if there's availability.)
I tried validating your itinerary against the oneworld.com itinerary checker & that wanted the second HKG transit to be 'no stopover' (but was otherwise happy), but I believe that the rules require one or other transit to be 'no stopover' rather than only the second.
The "transit without stopover" language regarding a second entry into Asia has been tossed around ceaselessly for the past couple of years. However,
Viajero's interpretation is the one now almost universally cited - the second entry is only valid if it's on a SWP < > Europe itinerary, not NA < > SWP.
The OW itinerary validator is still buggy and not to be relied upon. Only one of the airlines can authorize an itinerary.