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US National Airspace System (NAS) vocabulary
Defines concepts related to the structure of the US National Airspace System (NAS) @en -
Aircraft Equipment Vocabulary
Defines aircraft models, aircraft systems / subsystems, and aircraft characteristics @en -
Air Traffic Management (ATM) Vocabulary
Defines specific air traffic management concepts used in aircraft navigation through the US National Airspace System @en -
Air Traffic Data
Defines concepts related to airport status, including weather, forecasts, and airport operations @en