Against that, it expects to continue to benefit from growth in inbound tourism, a favourable outlook for fuel prices and the scale of its fleet.
The airline is halfway through a $2.2 billion capital expenditure programme to add new aircraft, reduce the age of its fleet and cut back on the variety of planes it operates.
It expects to have reduced the average age of its fleet to 6.7 years by 2018 from 8.6 years in 2012. It will be made up of the wide-body B787, B777s, the narrow-body A320 and the ATR762s and Q300 turboprops, reducing the fleet types by three to five in total.
Its gearing rose to 52.4 percent in 2015 from 42.9 percent the previous year, and it aims to keep gearing in a range of 45 percent to 55 percent, it said today. The increase reflected investment in its fleet and a stronger US dollar.
Air New Zealand has been reviewing its ownership of Virgin Australia and stopped equity accounting the investment on March 30, with changes in fair value now recorded in its profit and loss statement.
Virgin is also reported to be cutting back route frequency, while the Australian national carrier has also warned of a softer outlook for Australian domestic aviation.
The shares last traded at $2.51 and have declined 15 percent this year, partly reflecting rival Qantas Airways' decision to trim its expansion plans in response to weaker demand.
See Air NZ's latest investor presentation here: