A pilot assigned to an aviation brigade of the air force under the PLA Eastern Theater Command climbs into the cockpit of his J-11 fighter jet prior to a round-the-clock flight training exercise on March 20, 2020. (eng.chinamil.com.cn/Photo by Zhang Shu)

A pilot assigned to an aviation brigade of the air force under the PLA Eastern Theater Command climbs into the cockpit of his J-11 fighter jet prior to a round-the-clock flight training exercise on March 20, 2020. (eng.chinamil.com.cn/Photo by Zhang Shu)

A pilot assigned to an aviation brigade of the air force under the PLA Eastern Theater Command climbs into the cockpit of his J-11 fighter jet prior to a round-the-clock flight training exercise on March 20, 2020. (eng.chinamil.com.cn/Photo by Zhang Shu)