Air New Zealand's earnings are poised to come under significant pressure as a result of Qantas Airways' strategy of launching regional Jetstar flights in New Zealand and threatening to enter the monopoly New Zealand-mainland North America market in partnership with American Airlines, analysts say.

A Credit Suisse analysis has revealed Kiwi passengers in economy class are paying on average 38 per cent more per kilometre on non-stop flights between New Zealand the mainland US compared with what Australian passengers on Qantas pay per kilometre on the longer flights between Sydney and Melbourne and Los Angeles.