Allegiant Air has ordered 50 Boeing 737 MAX jets, with the option to add an additional 50 aircraft in the future.

The ultra-low-cost American airline selected the 737-7 and 737-8-200 models, which Boeing claim provide the lowest seat-mile costs for a single-aisle aircraft and high-dispatch reliability.

“Our approach to fleet has always been opportunistic, and this exciting transaction with Boeing is no exception,” said Allegiant’s chairman and CEO Maurice J. Gallagher, Jr.

“While the heart of our strategy continues to center on previously-owned aircraft, the infusion of up to 100 direct-from-the-manufacturer 737s will bring numerous benefits for the future – including flexibility for capacity growth and aircraft retirements, significant environmental benefits, and modern configuration and cabin features our customers will appreciate.”

Compared to Allegiant’s existing fleet of 108 Airbus A319 and A320 aircraft, the new Boeing 737 models are expected to reduce the airline’s fuel use and carbon emissions by 20 per cent.

“We are thrilled that Allegiant has selected Boeing and the 737 MAX as they position themselves for future growth, improved efficiency and operational cost performance.” said Boeing Commercial Airplanes’ president and CEO Stan Deal.

“This deal further validates the economics of the 737 MAX family in the ULCC market and we’re excited to stand alongside Allegiant as they integrate these new airplanes into their fleet.”