At Air New Zealand, operational problems were cascading early last year.

Problems with Rolls-Royce Trent engines were causing ripple effects that spread throughout the airline.

Initial problems with turbine blades spread deeper into the engines powering the airline's Dreamliners. When compressor blades were found to be faulty, Air NZ was forced to ground more of the planes for longer and some of those operating had restrictions on where they could fly.

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Tactics to turn it around

What's the outcome so far?