Hainan Airlines and Air Lease Corp. (ALC) have inked a long-term lease agreement covering a pair of Boeing 787-9s.

The aircraft will be sourced from ALC’s current order book, which comprises 46 787-9s and 787-10s due for delivery from spring 2016.

“These two new Boeing 787-9s leased to Hainan Airlines will be ALC’s very first Boeing 787-9 delivery,” ALC EVP and managing director, Asia, Jie Chen said.

The 787-9s will be the longest-range aircraft in Hainan’s fleet, joining its existing 787-8s. Last month it placed an order for 30 Boeing 787-9s, valued at $7.7 billion at list prices, to meet China’s continued growth. These aircraft will be delivered by 2021.

ALC already has two 737-800s on long-term lease with Hainan Airlines, dating back to 2010.