Around 40 per cent of passengers on Air New Zealand's Buenos Aires flights are Australian. It has a small home market so it has turned to Australian traffic for growth. The airline reported its second-highest profit of NZ$527 million (S$521.8 million) in the year ended June 30 in line with expectations. Revenue per available seat kilometre, a measure combining ticket prices and seats filled, fell by 9 per cent in the first half but rose by 2 percent in the final quarter and by 4.3 per cent in July. "We are very comfortable with the revenue environment." Chief Executive Christopher Luxon said in a telephone interview with Reuters on Wednesday. The airline said it planned to spend about NZ$1.5 billion on aircraft and associated assets over the next four years, including A320neo family narrowbodies, 787-9s and ATR72 turboprops, although that does not include a potential new order for long-haul aircraft to be delivered from 2021.