China-owned plane-leasing company BOC Aviation said it has ordered 50 Airbus aircraft of the A320 family, including 25 of the more fuel-efficient "neos".
The statement did not disclose the amount of the transaction, but price tags in the 2012 catalogue ranged from $4.41 billion (3.3 billion euros) for 50 classic A320s to $5.66 billion for 50 A321neos.
It said an announcement on the exact make-up of the order, which is scheduled for delivery between the second half of 2014 and the end of 2019, would be made later.
The order was the first by BOC Aviation for Airbus's new engine option.
Robert Martin, BOC Aviation's managing director and chief executive officer, said the firm was keen to offer its clients the latest energy efficient aircraft, explaining the presence of the new neo engine option in the order.
BOC Aviation, which is owned by the Bank of China but based in Singapore, owns or manages 203 aircraft operated by airlines worldwide with another 100 planes on firm order.