A J-11 fighter jet attached to an aviation brigade of the air force under the PLA Eastern Theater Command takes off from a military airfield during the round-the-clock flight training on January 6, 2020. (eng.chinamil.com.cn/Photo by Fu Gan)

A J-11 fighter jet attached to an aviation brigade of the air force under the PLA Eastern Theater Command takes off from a military airfield during the round-the-clock flight training on January 6, 2020. (eng.chinamil.com.cn/Photo by Fu Gan)

Two J-11 fighter jets attached to an aviation brigade of the air force under the PLA Eastern Theater Command soar in the sky during the round-the-clock flight training on January 6, 2020. (eng.chinamil.com.cn/Photo by Fu Gan)

Two J-11 fighter jets attached to an aviation brigade of the air force under the PLA Eastern Theater Command soar in the sky during the round-the-clock flight training on January 6, 2020. (eng.chinamil.com.cn/Photo by Fu Gan)

A J-11 fighter jet attached to an aviation brigade of the air force under the PLA Eastern Theater Command prepares to make its final approach after the round-the-clock flight training on January 6, 2020. (eng.chinamil.com.cn/Photo by Fu Gan)