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Advisory airspace is an airspace of defined dimensions, or designated route, within which air traffic advisory service is available.
An advisory route is a designated route along which air traffic advisory service is available.
(ICAO Annex 11: Air Traffic Services)
- ICAO Annex 11: Air Traffic Services
- ICAO Doc 4444: Procedures for Air Navigation Services - Air Traffic Management (PANS-ATM)