![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. (Photo/eng.chinamil.com.cn)](http://www.ecns.cn/hd/2018/09/18/34ebc54ab6e24ba5a657ac01dbe9a510.jpg)
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. (Photo/eng.chinamil.com.cn)
![A J-11B fighter jet attached to an aviation brigade of the air force with the PLA Northern Theater Command shoots a flare off during a recent round-the-clock flight training exercise. (Photo/eng.chinamil.com.cn)](http://www.ecns.cn/hd/2018/09/18/be136a2e16604a849383915f75518107.jpg)
A J-11B fighter jet attached to an aviation brigade of the air force with the PLA Northern Theater Command shoots a flare off during a recent round-the-clock flight training exercise. (Photo/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. (Photo/eng.chinamil.com.cn)](http://www.ecns.cn/hd/2018/09/18/3badf95e7f694db09405cfe1a7d15418.jpg)
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. (Photo/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. (Photo/eng.chinamil.com.cn)](http://www.ecns.cn/hd/2018/09/18/52052c065c5845e2a2f3c489ae1646e9.jpg)
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. (Photo/eng.chinamil.com.cn)
![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. (Photo/eng.chinamil.com.cn)](http://www.ecns.cn/hd/2018/09/18/4205918e174a4b07bb2d397cbf99705d.jpg)
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. (Photo/eng.chinamil.com.cn)
![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. (Photo/eng.chinamil.com.cn)](http://www.ecns.cn/hd/2018/09/18/2008e55c631744f2b5777c9ed5d99326.jpg)
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. (Photo/eng.chinamil.com.cn)