The PLAAF organizes the following routine air defense tasks: reconnaissance and early warning units are tasked with monitoring air situations in China's territorial air space and surrounding areas and keeping abreast of air security threats. Command organs at all levels are tasked with assuming routine combat readiness duties with the capital as the core, and border and coastal areas as the key, and commanding air defense operations at all times. Routine air defense troops on combat duty are tasked with carrying out air vigilance and patrols at sea, conducting counter-reconnaissance in border areas and verifying abnormal and unidentified air situations within the territory. The air control system is tasked with monitoring, controlling and maintaining air traffic order so as to ensure flight safety.