Hawaiian Airlines is planning to alter the wingtips of eight B-767 jets in order to reduce fuel costs.
The Honolulu-based carrier has signed an agreement with Aviation Partners Boeing to buy what are called blended winglets for installation on the eight jets.
The winglets, just over three metres long, extend upward from the end of each wing.
Hawaiian says the winglets reduce drag caused by the traditional wingtip design.
It says they are expected to save up to 5 percent in fuel consumption, resulting in savings of more than a million litres of fuel per aircraft annually.