When contacting the local control unit, a pilot will indicate he / she has " information ", where is the ATIS identification letter of the ATIS transmission the pilot received.
2.
"' Automatic terminal information service "', or "'ATIS "', is a continuous broadcast of recorded " noncontrol " aeronautical information in busier weather information, which runways are active, available approaches, and any other information required by the pilots, such as important NOTAMs . Pilots usually listen to an available ATIS broadcast before contacting the local control unit, in order to reduce the controllers'workload and relieve frequency congestion.
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