Malaysian airline Air Asia has boosted the size of its fleet, ordering 100 more A320 planes from Airbus.
The A320 is the second best-selling plane of all time
The group has also taken out an option for a further 30 planes as it prepares for the launch of a joint venture for budget long-haul flights, Air Asia X.
Air Asia declined to give details of the deal, but at catalogue prices it would be worth more than $6bn (£3bn).
The deal doubles an order the group placed with European planemaker Airbus last month for 100 of the A320s.
The small planes are used for short- and medium-haul flights, and are expected to be delivered after 2012.
Air Asia currently has a fleet of 50 aircraft, comprising 15 A320s and 35 Boeing 737-300s.
Earlier this month, the group said it was launching a no-frills long-haul service in partnership with Fly Asian Express, the carrier that is majority owned by Air Asia chief Tony Fernandes.