Such a busy time for the airport saw operating expenses rise 11.8 per cent to $75m in the first half, outpacing a 10.8 per cent rise in revenue to $310.9m. Underlying profit rose to $123.5m, just above brokerage Forsyth Barr's $119.2m forecast, from $104m a year earlier.
Chief executive Adrian Littlewood said responding with operational investment "is right when you're in this kind of growth". The company had made "conscious choices" such as increasing the headcount and boosting investment in technology and systems, and the pace of change "will continue for some time," he said on a conference call.
Shane Solly, a director at Harbour Asset Management, said having watched several growth cycles at Auckland Airport, they tend to be followed by some flattening off.
"It is a tiger by the tail in terms of managing the growth," he said. "Management is doing a very good job managing that process. It is a near-term tactical issue, while long term they are making the right decisions." In the first half, opex "was a bit higher than analysts had expected while passenger spend was a little bit lower".
Chief financial officer Philip Neutze said on the call that the projection for a slightly softer second half reflected the seasonal drop-off in load factors in New Zealand's winter months.
Airfield income showed the fastest growth in the first half, rising about 18 per cent to $59m, while its passenger services charge rose about 14 per cent to $85.9m. Investment property rental income rose 17 per cent to $32.5m.
The weakest growth came from retail income, up 2.7 per cent to $80.7m, with disruptions during terminal refurbishments taking much of the blame. Littlewood said there were also changes in the mix of passengers that were reflected in retailing, such as a trend for more Chinese to travel as free agents rather than in a group tour, and changes in spending habits such as a drop-off in high-end luxury items such as watches.
"We have to make sure the balance of our offering is right," he said.
The company lifted its first-half dividend by about 18 per cent to 10 cents a share.