Air China has entered into a purchase agreement with Boeing for 60 737 aircraft.
The order, worth $5.9 billion at list prices, comprises both the current 737 and the re-engined Max variant.
The aircraft will be delivered between 2016 and 2020.
Air China says the aircraft purchase will be funded through cash from its operations, commercial bank loans and other financing instruments.
The flag carrier had on 22 December disclosed that its board has approved the introduction of the 60 Boeing narrowbodies.
Flightglobal’s Ascend Fleets database shows that Air China has 10 737-800s on order, and also a letter of intent for an additional 20 of the type. The flag carrier also has a letter of intent for 56 Airbus A320s, with undisclosed engines.