Boeing Co. and China Southern Airlines have finalized an order for 12 787-9 Dreamliners to enhance the airlines’ long-haul fleet, the companies said Wednesday.

The order is valued at $3.2 billion based on list prices for the Dreamliners, but discounts are typically negotiated.

“The 787 Dreamliners have helped us to achieve initial success in implementing our internationalization strategy in the past few years and enabled us to make our operation and services more appealing to passengers,” China Southern CEO Tan Wangeng said in a news release. “The additional new 787-9s will further increase our capacity and services for our long-haul routes.”

China Southern already operates 10 787-8 Dreamliners among its fleet of 700 aircraft.

“China Southern has been a long-standing Boeing customer and we truly appreciate their confidence in the 787,” said Ihssane Mounir, a Boeing senior vice president. “The 787-9 will help the airline achieve a new level of efficiency and profitability.”