Air New Zealand (ASX:AIZ, NZE:AIR) and Air Chathams expanded their interline partnership to boost regional connections across New Zealand, according to a Wednesday statement.

Under the expanded collaboration, customers traveling to and from the Chatham Islands will be able to book a single journey connecting them with Air New Zealand's domestic network.

The partnership will also add Whanganui to the network, building on the launch of interline services to Whakatāne earlier this year, Air New Zealand said.

The expanded network connectivity between starts from Aug. 13.

Air New Zealand's Kiwi shares fell past 1% in recent Wednesday trade.