J-11BS fighters make a flight demonstration during an activity celebrating the 70th founding anniversary of the Chinese People's Liberation Army (PLA) air force in Changchun, capital of northeast China's Jilin Province, Oct. 17, 2019. The five-day activity, where the PLA air force will showcase weapons and equipment and offer aerobatic shows to celebrate its 70th founding anniversary, kicked off here on Thursday. The audience can feast their eyes on aerobatic flights, parachute shows, combat exercises of third-generation fighters and demonstrations of airborne special force. A total of 35 aircraft of 10 types will perform aerobatics, including J-20 stealth fighter, Y-20 transport aircraft and J-16 fighter. With 19 aircraft included, the air force selected 71 pieces of equipment for the static display to showcase the capacity of air combat, strategic delivery, early warning and detection, information support and air defense and anti-missile. (Xinhua/Lin Hong)