A helicopter performs during the air show 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/Marios Lolos)

A fighter jet performs during the air show 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/Marios Lolos)

Two Greek Air Force helicopters perform during the air show 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/Marios Lolos)

Parachutes are seen during the air show 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/Marios Lolos)

A Dutch airplane flies over an Olympic Air plane during the air show 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/Marios Lolos)

An aircraft performs during the air show 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/Marios Lolos)

Spectators watch a glider's performance 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/Marios Lolos)

Greek President Prokopis Pavlopoulos (C, front) arrives 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/Marios Lolos)

A Greek Navy airplane performs during the air show 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/Marios Lolos)

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)