United Airlines will replace Boeing 747-400 aircraft with 777-200s on flights between the US and Australia from 1 April 2014.
The Star Alliance member operates daily flights from both its San Francisco International airport and Los Angeles International airport hubs to Sydney and Melbourne.
"The 777 will be the ideal aircraft for our Australia routes in terms of both capacity and customer amenities," says James Mueller, United's vice-president Atlantic and Pacific sales. "Our trans-Pacific services from Sydney and Melbourne are an important part of United's global route network, and we look forward to offering our customers a full range of inflight products and services on the 777."
Innovata schedules show that the airline competes with Delta Air Lines, Virgin Australia and Qantas on the Sydney-Los Angeles route, while it competes on the Melbourne-Los Angeles route with Qantas and Virgin. United is a sole operator on the Sydney-San Francisco route.