A paratrooper presents the national flag of China during his performance on the first Changchun aviation open day in Changchun, capital of northeast China's Jilin Province, Sept. 1, 2011. The internationally renowned Bayi aerobatic team and newly established Hongying (red eagle) aerobatic team and Tianzhiyi (wing of the sky) aerobatic team, together with Lanying (blue eagle) paratroopers' team, presented the spectators with different kinds of performances. [Xinhua photo]