The Prime Minister's defending taking a backup Defence Force plane to the 55th Pacific Islands Forum.
Two 575s were deployed to take Chris Luxon to Palau.
The fleet's been plagued with break-downs, and is being replaced as part of the Defence Capability Plan.
Newstalk ZB senior political correspondent Barry Soper says there's a fair case for this, given that New Zealand has a responsibility to make sure the delegation runs smoothly.
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