Hawaiian Airlines is continuing to expand its US mainland network, as it takes delivery of two more Airbus A321neos.

The carrier has recently received its fifth and sixth A321neos, which will enter service later in July after some additional preparatory work, the carrier told ATW.

Hawaiian ordered a total of 18 A321neos, with all expected to be used on flights between Hawaii and the US mainland. They will be used to launch new secondary routes and to replace aircraft on some existing routes.

Hawaiian currently operates its A321neos on four routes: from both Honolulu and Maui to Portland, Oregon; from Maui to San Diego, California; and from Honolulu to Long Beach, California. The aircraft will be used to launch a new flight from Lihu’e to Oakland, California, July 16, and the carrier recently announced it will introduce a route from Maui to Sacramento, California, in April 2019.

The airline was previously intending to operate a seasonal flight from Kona to Oakland this summer, but had to shelve that plan because of A321neo delivery delays. Hawaiian has not revealed a new start date for this route, but said it is “continuing our planning” for 2019.

By September, Hawaiian expects the A321neos to be flying out of four airports in Hawaii. However, all of the A321neos are based at Honolulu.

Editor's note: An earlier version of this story incorrectly said Hawaiian operates Honolulu to Oakland. That has been corrected to Honolulu-Long Beach

Adrian Schofield, Avweekscho@gmail.com