Air New Zealand will buy 15 new aircraft for its regional routes in a deal worth close to $600 million.
The national carrier will buy the ATR72-600 aircraft to replace 11 of its ATR72-500 fleet while the four extra planes, each able to carry 68 passengers, will allow domestic growth.
The list price for the new aircraft is US$375m (NZ$569m).
Chief executive Christopher Luxon said the extra four aircraft will provide an additional 600,000 seats each year into the New Zealand regional market.
In 2012 it said it would buy 14 ATR72-600 aircraft, and seven have been delivered with the last planes due to join the fleet by mid-2016.
The new 15 planes will begin arriving from late next year.
Its 29 ATR aircraft will mean it will operate the third largest ATR fleet in the world.