Spectators watch a CL-415 aircraft making water drop demo at the Tanagra Air Base, north of Athens, Greece, on Sept. 21, 2019. Greece's largest air show, the Athens Flying Week (AFW) Tanagra International Air Show 2019, took off Saturday for its 8th consecutive year at Tanagra Air Base, about 70 kilometers northwest of Athens. (Xinhua/Li Xiaopeng)