VietJet Air has signed a memorandum of understanding that covers 100 more Boeing 737 Max jets, after ordering the same number in 2016.
The new agreement, disclosed by Boeing at the Farnborough air show, spans 80 Max 10s and 20 Max 8s. The airframer puts its list-price value at $12.7 billion.
VietJet will become the largest Max 10 customer in Asia once the deal is completed, Boeing notes. It adds that the privately owned Vietnamese low-cost carrier will use the Max 10 "to satisfy surging demand on high-density domestic routes" and to serve "popular destinations throughout Asia".
Nguyen Thi Phuong Thao, the airline's chief executive, states: "These new airplanes will fit perfectly into our growth strategy, providing the efficiency and range for VietJet to expand its route network and offer more international destinations for our customers and expand alliances across Asia-Pacific."
Boeing says that, as part of the agreement, it will partner with VietJet to "enhance technical and engineering expertise" and train pilots and technicians in Vietnam. The airframer adds that it will "support VietJet in improving management capabilities at the airline and in the country".
In 2016, VietJet finalised an order for 100 high-capacity 737 Max 8 jets.
Boeing says the follow-on deal will be reflected on its orders and deliveries website once finalised.