Two J-11B fighter jets attached to an aviation brigade of the air force under the PLA Northern Theater Command take off in formation for sorties during a recent round-the-clock flight training exercise. (Photos: eng.chinamil.com.cn）

A J-11B fighter jet attached to an aviation brigade of the air force with the PLA Northern Theater Command performs the stiff pitch during a recent round-the-clock flight training exercise.

A J-11B fighter jet attached to an aviation brigade of the air force with the PLA Northern Theater Command performs the stiff pitch during a recent round-the-clock flight training exercise.

A J-11B fighter jet attached to an aviation brigade of the air force with the PLA Northern Theater Command dives from the sky to attack mock ground targets during a recent round-the-clock flight training exercise.

A J-11B fighter jet attached to an aviation brigade of the air force with the PLA Northern Theater Command dives from the sky to attack mock ground targets during a recent round-the-clock flight training exercise.