Authorities have announced an investigation is underway after engine "abnormalities" on two separate Air New Zealand flights in the space of two days saw two flights forced to return to Auckland shortly after take-off.
The engine issues both happened on Boeing 787 Dreamliner planes flying out of Auckland bound for international destinations.
The first was an Air New Zealand flight headed for Narita, Japan on Tuesday morning, where the crew shut down an engine and returned to Auckland shortly after take-off.
Last night another Air New Zealand 787, headed to Buenos Aires, Argentina, experienced an engine issue shortly after leaving Auckland and was also forced to return.
In a statement released today the Transport Accident Investigation Commission say they've opened inquiries into both events, with investigators having been on the ground in Auckland since Tuesday.
The commission say they're working closely with Air New Zealand, the Civil Aviation Authority and engine-manufacturer for Boeing Dreamliners Rolls Royce.