The Okinawa-based JTA currently operates a fleet of Boeing 737-400s.
The order is for the 737-800 version and is worth US$1.1 billion at list price.
It was first announced as a commitment late March. The airplanes will start arriving in 2016.
“This order is a key part of our strategy to bring the highest levels of comfort, amenity and convenience to the people of Okinawa, by continuing to operate the most reliable and fuel-efficient aircraft available today and in the future,” said Manabu Sato, president of JTA.
Boeing says the 737-800 is the best-selling version of the 737NG family.
“The Next-Generation 737’s market success has been confirmed by investors who consistently rank it as the most preferred single-aisle airplane due to its wide market base, superior performance efficiency and lowest operating costs in its class,” the company said today.