Você não precisa de visto, desde que permaneça na área de trânsito internacional do aeroporto.
O Timatic, o banco de dados usado pelas companhias aéreas para verificar os documentos de viagem dos passageiros, declara:
TWOV (Transit Without Visa):
Visa required, except for Passengers with a confirmed onward
(Air-to-Air or Air-to-Sea) ticket to a third country within 48
hours. They must stay in the international transit area and
have documents required for the next destination.
Você não pediu, mas em relação à Nova Zelândia, se você tem um visto, mas não há etiqueta de visto no seu passaporte, você precisa trazer sua carta de aprovação.
Visa Issuance:
New Zealand issues both printed visa labels and label-less
visas. Printed visa labels are inserted into a passport or
travel document. There is no physical evidence of a
label-less visa in the passport or travel document but all
passengers must carry a printed visa approval letter that
confirms the details of their visa.
The New Zealand visa record is held in Immigration New
Zealand's systems and authority to board should be verified
using the NZ APP system. Airlines not connected to NZ APP
that carry a passenger on an earlier leg of their journey,
can use TIETACNZ, or view the printed visa label or the visa
approval letter to identify any travel conditions, such as
whether the person is exempt from the requirement to hold a
return/onward ticket.