The 787-10 has a quoted range of 6,400 nautical miles. AKL - LAX is just a bit further than this at 6,504 and SFO 6,516 nm. A range boost would get the plane to LAX and SFO and make it a lot more versatile in the fleet.
Air NZ now fly to an increasing number of destinations in Asia with the 787-10 able to fly to all these cities, except for PEK which is 6,463 nm. The range boost could be utilised to there as well.
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