| ACC | string
| Area control centre. |
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| ADSU | string
| Automatic dependent surveillance unit. |
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| ADVC | string
| Advisory centre. |
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| ALPS | string
| Alerting post. |
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| AOF | string
| Aeronautical information services office. |
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| APP | string
| Approach control office. |
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| APP_ARR | string
| Arrivals approach control office. |
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| APP_DEP | string
| Departures approach control office. |
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| ARO | string
| Aerodrome reporting office/ATS reporting office. |
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| ATCC | string
| Air traffic control centre. |
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| ATFMU | string
| Air traffic flow management unit. |
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| ATMU | string
| Air traffic management unit. |
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| ATSU | string
| Air traffic services unit. |
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| BOF | string
| Briefing office (note: Note ICAO listed by nonetheless used.) |
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| BS | string
| Commercial broadcasting station. |
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| COM | string
| Communications office/centre. |
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| FCST | string
| Forecasting office. |
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| FIC | string
| Flight information centre. |
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| GCA | string
| Ground controlled approach systems office. |
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| MET | string
| Meteorological office. |
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| MWO | string
| Meteorological watch office. |
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| NOF | string
| International NOTAM office. |
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| OAC | string
| Ocean control centre. |
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| PAR | string
| Precision approach radar centre. |
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| RAD | string
| Radar unit/office. |
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| RAFC | string
| Regional area forecast centre. |
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| RCC | string
| Rescue co-ordination centre. |
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| RSC | string
| Rescue sub-centre. |
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| SAR | string
| Search and rescue centre. |
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| SMC | string
| Surface movement control office. |
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| SMR | string
| Surface movement radar office. |
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| SRA | string
| Surveillance radar approach office/centre. |
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| SSR | string
| Secondary surveillance radar office/centre. |
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| TAR | string
| Terminal area surveillance radar office/centre. |
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| TWR | string
| Aerodrome control tower. |
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| UAC | string
| Upper area control centre. |
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| UDF | string
| UHF direction finding station. |
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| UIC | string
| Upper information centre. |
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| VDF | string
| VHF direction finding station. |
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| WAFC | string
| World area forecast centre. |
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| ARTCC | string
| Air route traffic control centre. |
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| FSS | string
| Flight service station. |
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| TRACON | string
| Terminal radar approach control. |
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| MIL | string
| Military station/unit (or military office in general). |
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| MILOPS | string
| Planning/briefing office for military flight operations. |
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| OTHER | string
| Other. |
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