Air China has detailed its order for 100 Airbus aircraft, confirming that it covers aircraft destined not only for the flag-carrier but also Chinese subsidiary Shenzhen Airlines.
The board of Air China approved the introduction of 100 Airbuses during a meeting in early May, during which it also said it would dispose of six A340s.
It did not identify, at the time, the type involved in the purchase.
But Air China says in a filing on 24 May that it has agreed to purchase 60 A320s while Shenzhen Airlines will purchase 40.
No engine selection has been disclosed. Both Air China's and Shenzhen Airlines' A320-family fleets are fitted with a mix of CFM International CFM56 and International Aero Engines V2500 powerplants.
Air China will take delivery of its A320s, worth $5.4 billion, during 2014-20 while the Shenzhen twinjets, worth $3.5 billion, will be delivered from 2016-20.
The airlines state that the purchase price is subject to concessions, and have not indicated whether any of the aircraft will be delivered as re-engined A320neos - even though Airbus intends to have cut over to all-A320neo production by 2018.
Air China says that Airbus will buy back the six A340s being sold by the carrier, without giving terms for the sale.