All Nippon Airways (ANA) says it will take another 11 higher capacity, long-range 787-9s, raising its totals to 66 aircraft, by far the largest order rate for Boeing’s twin-engine transport.

With the addition of these -9s, the Japanese carrier’s 787 fleet will eventually include 36 787-8s and 30 787-9s. This is the second follow-on 787 order for ANA, which originally purchased 50 of the type.

The 11 latest aircraft are scheduled to be delivered from 2018 to 2021, ANA says. As of August, ANA had taken delivery of 13 787-8s.

ANA is using the 787s on eight domestic routes and Tokyo-Frankfurt services from Hanada airport. In January it plans to launch flights from Tokyo’s Narita airport to San Jose, Calif., and switch a current Narita-Seattle service to the 787 on Oct. 1. On Oct. 28, ANA also will initiate Narita-Beijing 787 service.

The airline is yet to decide which engine option it will use for the additional 11 orders. The 55 existing 787 orders all have Rolls-Royce Trent 1000 engines.

Correction: The story originally misstated the engine selection status of the latest orders.