Japanese airline group ANA Holdings has announced they will acquire up to 20 more 787 Dreamliner airplanes. Valued at over $5 billion, the agreement with Boeing includes eleven 787-10s, one 787-9 and options for five 787-9s. There are also plans to acquire three new 787-9 planes from Atlantis Aviation Corporation.

“Boeing’s 787s have served ANA with distinction, and we are proud to expand our fleet by adding more of these technologically-advanced aircraft,” said Yutaka Ito, executive vice president of ANA and ANA HD. “These planes represent a significant step forward for ANA as we work to make our entire fleet even more eco-friendly and further reduce noise output.”

The Dreamliner 787-10 are the most fuel-efficient models, with 25% better fuel efficiency per seat compared to older airplanes in its class thanks to their ANA GE’s GEnx-1B engines. ANA is in a class by itself as the world’s biggest 787 operator with 71 airplanes in its fleet and 12 more to be delivered prior to the latest agreement.