The 15th Aviation Expo China kicks off at the China National Convention Center, in Beijing on Wednesday, Sept. 25, 2013. Well-known international aviation companies, including Boeing, Honeywell, Bombardier, MTU, IAE, Bell Helicopter, Motor-Sich, Esterline and AVISMA attend the expo. The expo, known as the only aviation exhibition permitted in Beijing, is a biennial event initiated in 1983. [Photo/People.com.cn]