Delegates sign documents at the groundbreaking ceremony of Boeing 737 Completion and Delivery Center in the Zhujiajian aviation industry park of Zhoushan, a port city in east China's Zhejiang Province, May 11, 2017. Construction of Boeing's first overseas facility as part of its 737 production system started Thursday in Zhoushan. The construction will consist of two parts -- a Boeing 737 completion center and the delivery center. It is scheduled to be completed in 2018. (Xinhua/Xu Yu)