Boeing [NYSE: BA] and Donghai Airlines announced today the airline’s intent to purchase 25 737 MAX 8s and five 787-9 Dreamliners at the 2016 Farnborough International Airshow. The agreement is valued at more than $4 billion at current list prices.

Shenzhen-based Donghai Airlines previously ordered 15 Next-Generation 737-800s and 10 737 MAX 8s in 2013. Donghai continues to fulfill its strategic plan to convert its business model from cargo services to passenger services.

“Donghai Airlines has undergone steady development over the past 10 years since the beginning of our freighter operations in 2006,” said Mr. Wong Cho-Bau, Chairman, Donghai Airlines. “Under China’s One Belt One Road initiative, we will accelerate our fleet expansion plan to satisfy the rapidly growing air travel market and help build our home base Shenzhen as the transportation hub in southern China. We’re committed to introducing new next-generation airplanes that deliver the industry-leading fuel efficiency and passenger comfort in their segment market as a key effort to fulfill the plan.”

Boeing will work with Donghai Airlines to finalize the details of the agreement. The order will be posted on Boeing’s Orders & Deliveries website once all contingencies are cleared.

“We are honored by Donghai Airline’s reaffirmation of the 737 MAX, and we look forward to welcoming Donghai as our new 787 customer,” said Boeing Commercial Airplanes President & CEO Ray Conner. “These new airplanes will provide Donghai Airlines with the added efficiency, operating economics and passenger comfort for their business growth domestically and internationally.

Boeing press release