The first of 30 Boeing B737 MAX aircraft has been delivered to Oman Air as the Sultanate’s flag carrier continues its ongoing fleet expansion.

The airline has been operating B737s previously but says with the MAX it will be able to achieve a double-digit percentage improvement in fuel efficiency.

Abdulaziz Al-Raisi, acting CEO at the airline, said the new aircraft would be “a perfect complement to our existing 737 family as we continue to expand our operations.” The carrier has the MAX 8 aircraft configured to seat 162 passengers.

Oman Air ordered 20 MAX airplanes in October 2015 and has since entered into a lease agreement for 10 more. The aircraft will add to the Muscat-based airline’s existing fleet of 27 B737s and seven B787 Dreamliners.