NOTAM (Notice to Air Missions) system

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Recently ,NOTAM (Notice to Air Missions) system failed to disrupt US flights.

About NOTAM 

• It is a notice containing information essential to personnel concerned with flight operations but not known far enough in advance to be publicized by other means.
•  It states the abnormal status of a component of the National Airspace System (NAS) – not the normal status.
• It indicates the real-time and abnormal status of the NAS impacting every user.
• It concerns the establishment, condition, or change of any facility, service, procedure or hazard in the NAS.
• It has a unique language using special contractions to make communication more efficient.

Source: IE