China is rapidly expanding a flight-test facility deep in its western desert, satellite imagery has revealed, a push that analysts say could help fast track the development of its next-generation military aircraft as air-power rivalry with the United States intensifies. Latest satellite photos of the facility near Lop Nur, in China’s western Xinjiang region, show four large new hangars, new taxiway work, a circular pad believed to be an engine-run or turnaround area, and possible fuel-storage...