Chinese developed PT-6 primary training planes of the "Sky Wing Air Demonstration Team" perform during the Changchun First Aviation Open Day and the opening ceremony of new semester of the Air Force Aviation University, in Changchun, capital of Northeast China's Jilin province, Sept 1, 2011.[Photo/Asianewsphoto]

Spectators watch the Chinese developed PT-6 primary training planes of the "Sky Wing Air Demonstration Team" fly by during the Changchun First Aviation Open Day and the opening ceremony of new semester of the Air Force Aviation University, in Changchun, capital of Northeast China's Jilin province, Sept 1, 2011.[Photo/Asianewsphoto]