The National Development and Reform Commission has approved four new airports, and an experimental aviation project, worth a total investment of 16.84 billion yuan ($2.71 billion), according to an announcement posted on its website. The airport projects are in Shache and Ruojiang, in Xinjiang Uygur autonomous region, Wudalianchi in Heilongjiang province, and Haikou in Hainan province. The experimental project is at the China Academy of Civil Aviation Science and Technology in Beijing.