AIRAC data (Aeronautical Information Regulation And Control) is updated every 28 days and includes data such as:

• Airport structure and route revisions
• Navigation aid changes
• runway and taxiway information changes
• SID (Standard Instrument Departure) and STAR (Standard Terminal Arrival Route) amendments

It is used by the aerospace industry to ensure efficiency and safety, and that all parties are working with the same (up to date) information. These parties include:

• Aircraft and pilots
• Air Traffic Control
• Air Traffic Flow Management
• Flight Planners and Dispatchers
• Aeronautical Charts

Aeronautical Information Regulation and Control (AIRAC) (icao.int)