Hawaiian Airlines intends to buy at least 16 Airbus A321neos to be delivered between 2017 and 2020.
The memorandum of understanding, valued at $2.8 billion at list prices, commits the carrier to buy as many as 25 A321neos, including potential orders for 16 and purchase rights for a further nine aircraft.
Hawaiian plans to configure the twinjet in a two-class layout with 190 seats.
The A321neo, which boasts a range of 3,650nm (6,750km), appears to open markets for Hawaiian slightly beyond the US Pacific Coast. Hawaiian also operates 18 123-seat Boeing 717-200s on routes within the Hawaiian islands.
The latest commitment, if finalised, adds to Hawaiian's growing backlog of Airbus orders. The carrier is already phasing out its fleet of 16 Boeing 767s with 22 A330-200s, including nine already delivered, and six A350-800s.