Two aircrafts perform aerobatics at the Neifu Airport in Pucheng, northwest China's Shaanxi Province, Oct. 18, 2013. The China International General Aviation Convention 2013 kicked off in Xi'an on Oct. 17. During the convention, 112 aircrafts are on display and 28 take part in aerobatics performance. (Xinhua/Ding Haitao)