https://www.facebook.com/SpringAirli...88764404482817
"1、目前,中國的空域管理權屬於空軍,民航總局只能在空軍的允許範圍內使用空域。一旦空軍在某片空域演習 ,此空域的所有民航飛機將全部禁飛。由於演習的持續時間,管控領域屬於軍事機密,遇到此種情況的航空公司只 能以空中管制為由向旅客交待。 "
Translation
"1. At present (as of July 2013), Chinese airspace is controlled by the PLAAF, CAAC can only use airspace designated by the PLAAF. If there are military drills in a certain sector, all civilian aircraft will be banned on that sector. And as military drills in progress are a military secret, airlines are only permitted to say air flow controls are in effect"