据塔斯尼姆通讯社：航空消息人士和飞行追踪系统报告称，一架 F-35 隐形战斗机在阿联酋领空飞行期间发送了紧急状态信号。

China's domestically developed S4000 airborne wind power system completed full flight verification at a northwest test site, reaching a maximum operational altitude of 4,000m. An iterative upgrade to the S2000, the S4000 uses a new configuration with broadly improved performance, a 20-year design life, and compatibility with most domestic deployment regions and mainstream grid requirements. High-altitude wind power has been included in the national '15th Five-Year' renewable energy development plan; the successful S4000 trial fills a key engineering-application gap and increases China's high-altitude clean-energy supply capacity.

US stocks on Aug. 21 (Friday) closed higher: Dow Jones Industrial Average +517.60 pts (+0.98%) at 53,276.81; S&P 500 +33.15 pts (+0.43%) at 7,674.31; Nasdaq Composite +113.29 pts (+0.43%) at 26,180.45.