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After thinking about it - A346 better serves longer haul routes with moderate capacity - so I suspect BKK-AKL will remain untouched. East cost of Aust is, I reckon, right on the point where a 777 might be a better aircraft, but only if there is sufficent demand to utilise the additional capacity that the 777 has over the A346.
I brought some of the TG worldwide timetable, but stopped doing so as if was frequently inaccurate in details. The suggestion of 777 to MEL might, for instance, have been the plan a year ago - but tby the time the booklet is printed the aircraft type for any particular route may have changed depending a host of factors like new routes, aircraft deliveries/refurbishment programmes and so on.