In August last year, All Nippon Airways announced it would replace all 100 Rolls-Royce engines on its fleet of Boeing 787 Dreamliners following three engine failures earlier in the year.
They shut down the engine and returned to the airport.
Singapore Airlines (SIA) and Air New Zealand on Thursday said they will jointly launch a third daily flight between Singapore and Auckland, boosting capacity on the route by 40 per cent and adding more than 165,000 seats annually between the two cities.
"At this stage our investigation team is satisfied all parties are doing the right thing to ensure the continuing safety of the travelling public".
TAIC is working closely with the airline, Civil Aviation Authority and engine-manufacturer Rolls Royce. "Should the Commission believe that insufficient action is being taken at any time then it has the ability to issue urgent recommendations while its inquiries continue".
The Star Alliance carrier says that following two recent events, Rolls-Royce has advised that its fleet's Trent 1000 engines "require maintenance sooner than previously indicated".
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Britain's Daily Telegraph reported Air New Zealand is the latest Rolls Royce customer to suffer problems with the T-1000 engines on the Dreamliner.
Air New Zealand is not the first airline to report issues with Rolls-Royce's Trent 1000 engines. A few weeks later Virgin Atlantic said it was had also experienced similar troubles with its Trent 1000 engines.
The new service and revised flight schedules are subject to regulatory approvals, and tickets will be made available progressively through various distribution channels from Dec 8, 2017 onwards, said the airlines.
"Rolls - which has more than 400 of the US$10m engines in service - has acknowledged the problems".
Nick Judd, Air New Zealand's chief strategy, networks and alliances officer, Nick Judd, added that the extra flight would be "especially appealing to travellers to and from Europe, India and southeast Asia".