Boeing announced Tuesday that China Southern Airlines has agreed to buy 10 long-haul 777 aircraft, a deal that still requires Chinese government approval.

"We're very pleased that China Southern, which has been a staunch 777 supporter from the very beginning of the program, has once again selected the 777-300ER to serve its passengers and to deliver value to its bottom line," Ihssane Mounir, vice president of sales at Boeing Commercial Airplanes, said in a statement.

Bringing twin-engine efficiency and reliability to the long-range market, the 777-300ER extends the Boeing 777 family's span of capabilities and can carry 365 passengers, according to Boeing.

Information posted on Boeing website shows that the list price for a 777-300ER is about 298 million U.S. dollars.