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air navigation facility
avia., amer.	Any facility used, available for use, or designed for use as a NAVAID including landing areas, lights, any apparatus or equipment for disseminating weather information, for signalling, for radio-directional finding, or for radio or other electrical communication, and any other structure or mechanism having a similar purpose for guiding or controlling flight in the air or the landing and takeoff of aircraft

air navigation: 3 phrases in 3 subjects

Abbreviation	1
Meteorology	1
Transport	1