Japan's ANA Holdings has firmed its agreement for 30 Airbus A320neo jets, and will become the first operator of the type in the country.
Deliveries of the new fleet, comprising 23 A321neo and seven A320neo aircraft, will begin in 2016.
The re-engined jets will provide "maximum flexibility and improved fuel efficiency", says ANA president Shinichiro Ito.
ANA is to fit the aircraft with Pratt & Whitney PW1100G engines. The carrier had originally disclosed in March its plans to take the 30 aircraft.