Consolidated Report by ChinaAbout.net: In response to the wide concern over flight delays in China, authorities said on 27th that the flight delay reasons are complex and diverse, the specific reasons include:
airline operations management (42.3%);
aviation control (26.1%);
inclement weather (20.9%);
military factors (7%); &
airport security (3.7%).
All aviation airspace is open for military and civilian usage, a relatively fixed 34% airspace is used by civilian flights while 25% is used by the military activities and 41% of the airspace is basically not used by both military and civilian routes.