And at the same time Norwegian orders 19 more B789s (+ 10 options) from Boeing. Deliveres will be from 2017 - 2019.
Boeing, Norwegian Finalize Order for 19 787-9 Dreamliners - Oct 22, 2015
I guess the delivery slots will come from cancelled orders from Aeroflot this summer + "secret customer" (suspected to be EY/AB) order at the same time.