Airlines have welcomed plans to build a third runway at Hong Kong Airport but are worried about how it will be paid for.
The airport, under pressure from other Asian and Middle Eastern hubs, is still seen as a critical link in global connectivity.
Last year the airport handled 63 million travellers and 4.4 million tonnes of freight and Hong Kong's rulers have just announced a US$19.3 billion ($26.4 billion) expansion by 2023 to handle more growth.
The International Air Transport Association said the airport was expected to serve 100 million passengers and handle nine million tonnes of cargo by 2030. It is a key hub for many New Zealanders travelling to Asia or Europe.
"IATA has long been an advocate of the need for a third runway in Hong Kong. And it is in the interest of everyone in Hong Kong to see the aviation industry flourish," said the association's director-general and chief executive Tony Tyler. However, in a speech to the Foreign Correspondents Club of Hong Kong he warned that expansion should be built, financed and funded wisely.