Fourth C919 jet departs from Shanghai to eastern airport(1/6)

A fourth prototype of China's large passenger jet C919 takes off from a runway at Shanghai Pudong International Airport, Aug. 30, 2019, on its way to an airport in Dongying City, East China’s Shandong Province. Tests on the fourth prototype now underway include the avionics system, its takeoff and landing performance, the automatic flight system and its performance in icy conditions. (Photo: China News Service/Yin Liqin)

A fourth prototype of China's large passenger jet C919 takes off from a runway at Shanghai Pudong International Airport, Aug. 30, 2019, on its way to an airport in Dongying City, East China’s Shandong Province. Tests on the fourth prototype now underway include the avionics system, its takeoff and landing performance, the automatic flight system and its performance in icy conditions. (Photo: China News Service/Yin Liqin)

A fourth prototype of China's large passenger jet C919 takes off from a runway at Shanghai Pudong International Airport, Aug. 30, 2019, on its way to an airport in Dongying City, East China’s Shandong Province. Tests on the fourth prototype now underway include the avionics system, its takeoff and landing performance, the automatic flight system and its performance in icy conditions. (Photo: China News Service/Yin Liqin)

A fourth prototype of China's large passenger jet C919 takes off from a runway at Shanghai Pudong International Airport, Aug. 30, 2019, on its way to an airport in Dongying City, East China’s Shandong Province. Tests on the fourth prototype now underway include the avionics system, its takeoff and landing performance, the automatic flight system and its performance in icy conditions. (Photo: China News Service/Yin Liqin)

A fourth prototype of China's large passenger jet C919 takes off from a runway at Shanghai Pudong International Airport, Aug. 30, 2019, on its way to an airport in Dongying City, East China’s Shandong Province. Tests on the fourth prototype now underway include the avionics system, its takeoff and landing performance, the automatic flight system and its performance in icy conditions. (Photo: China News Service/Yin Liqin)

A fourth prototype of China's large passenger jet C919 takes off from a runway at Shanghai Pudong International Airport, Aug. 30, 2019, on its way to an airport in Dongying City, East China’s Shandong Province. Tests on the fourth prototype now underway include the avionics system, its takeoff and landing performance, the automatic flight system and its performance in icy conditions. (Photo: China News Service/Yin Liqin)