Qantas Airlines has finalized a $9 billion deal to purchase 110 of Airbus' A320 aircraft as it gears for its expansion plans into Asia.

"The firm order for 78 A320neo and 32 A320s is the largest single order in Australian aviation history by aircraft units," Airbus said in a statement on Thursday.

Qantas CEO Alan Joyce said the deal reinforces the airline's plans to launch two new Asian brands, including a low-cost tie-up with Japan Airlines and Mitsubishi Corp, as well as a separate joint-venture premium airline.

"The Airbus A320 will be the launch aircraft for Qantas' new premium airline based in Asia and will support Jetstar's expansion plans -- including the establishment of Jetstar Japan," the Qantas CEO said.

The two airline companies originally announced the arrangement in August, involving at least 78 of the more fuel-efficient A320neos. The A320neo burns 15 percent less fuel than the original A320.

Airbus said the A320 family orders have surpassed 7900, reaffirming its status as the world's best-selling single-aisle aircraft model.

The A320neo is due to enter service in 2015.