Bayi Aerobatics Team of the People's Liberation Army (PLA) Air Force perform during an air show for the Changchun First Aviation Open Day in Changchun, in northeast Chinas Jilin province, on September 1, 2011. China's defence budget will rise 12.7 percent in 2011 to 601.1 billion yuan (91.7 billion USD), a government spokesman said in March, amid persistent regional concerns about Beijing's military build-up.
Aerobatic team Hongying, made up of JL-8 jet trainer aircrafts of the People's Liberation Army (PLA) Air Force, leave coloured trails of smoke as they take part in a performance to mark the beginning of a new semester at the Aviation University of Air Force in Changchun, Jilin province September 1, 2011.