Air New Zealand is poised to announce new-model Boeing Dreamliners as its next tranche of widebody planes in one of its most important fleet decisions in the past 15 years.

The airline will early next week officially unveil the replacement for its eight 777-200s, with widespread reports of Boeing winning a battle over Airbus for the deal which is valued at between $1.5 billion and $2.3b depending on discounts, deals with engine makers and the nature of maintenance agreements.

Following a two-year process the airline narrowed down its options to a new iteration of the Dreamliner, which it has been