"By the time we take off and land we'll get one run through - it's just a timing thing."
A head wind added an hour to the crossing which meant there was time for another service, Parton said.
The airline now had a sole supplier in economy - the Villa Maria stable - and this had allowed it to simplify its process and make savings.
"We're spending more - we're investing another $5 million food and wine throughout the country," he said.
The airline would soon announce ways it would broaden the range of wine in business class beyond those submitted to the awards it sponsors every year, said head of procurement, Anna Palairet.
"The problem we found with that is that only about 30 per cent of the industry submit their wine through that forum.
"Not only we're we not seeing a wide enough spectrum from that pool, the industry was upset because they didn't have the opportunity to submit their wine to us," she said.
The airline has appointed two leading international wine judges and commentators to help select its wine and help promote New Zealand labels overseas. One is based in California and the other in China.
Air New Zealand serves about one million bottles of wine a year and Parton said Sauvignon Blanc was the most popular wine but increasing amounts of Chardonnay was being drunk.