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Aeronautical Information Circular
abbr., scottish	AIC
aeronautical information circular
avia., avia., ICAO	A notice containing information that does not qualify for the origination of a NOTAM or for inclusion in the AIP but which relates to flight safety, air navigation, technical, administrative or legislative matters
avia., Canada	A circular providing advance notification of major changes to legislation, regulations, procedures or purely administrative matters, where the text is not part of the AIP Canada (ICAO)

Aeronautical: 7 phrases in 3 subjects

Abbreviation	5
Meteorology	1
Military	1