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NAN (next authority notified) - notifies the accepting unit that it can initiate a CPDLC start request. At the majority of aerodromes where ATS is provided, there is an AFTN station. A number of such stations grouped together and around an AFTN centre form an AFTN circuit. Service messages (priority indicator as appropriate). This category comprises messages originated by aeronautical fixed stations to obtain information or verification concerning other messages which appear to have been transmitted incorrectly by the aeronautical fixed service. Aeronautical information services (AIS) messages (priority indicator GG) comprise messages concerning NOTAMs and SNOWTAMs. ROF (request on frequency) - indicates a request by the accepting unit for an early transfer of the flight.

Note: The list below contains the most frequently used OLDI messages and the explanations are intended to provide the basic meaning of those messages rather than being a complete description. The OLDI specificcation can be found in the Further Reading section. RLS (release) - used by the transferring unit to release a flight. The message may be used as a response to a RRQ or on the initiative of the transferring controller.Meteorological messages (priority indicator GG) comprise messages concerning forecasts (TAFs) and observations and reports (METAR, SPECI). Aeronautical administrative messages (priority indicator KK) comprise messages regarding the operation or maintenance of facilities, the functioning of aeronautical telecommunication services and those exchanged between civil aviation authorities relating to aeronautical services. MAS (manual assumption) - informs the transferring unit that the accepting unit has established radio communication with the flight.

On-Line Data Interchange (OLDI) is a protocol for co-ordination and transfer of current flight data between adjacent air traffic control units. Its development started in the 1990s in Europe. Coordination (dialogue procedure). This procedure provides facilities for communication and negotiation between controllers in the coordination phase and for communication in the transfer phase. The ACT and REV messages described above may also be used for this procedure. MAC (message for abrogation of coordination) - indicates that a previous coordination or notification is being abrogated. The SGI 1600SW was the only monitor produced in significant quantities with an OpenLDI connection, though it had minor differences from the final published standards. The 1600SW used a 36-pin MDR36 male connector with a pinout that differs from that of the 36-pin centronics-style connector in the OpenLDI standard.Urgency messages (priority indicator DD). This category comprises messages concerning the safety of a ship, aircraft or other vehicles, or of some person on board or within sight. RTI (request tactical instructions) - used by the accepting unit to request the transfer of a flight on an assigned heading, speed, rate of climb or descent or on a direct routing. A worldwide system of aeronautical fixed circuits provided, as part of the aeronautical fixed service, for the exchange of messages and/or digital data between aeronautical fixed stations having the same or compatible communications characteristics. PAC (preliminary activate message) - notifies the next ATC unit of a flight that has not departed yet in situations where the flight time from departure to the boundary is less than the requirement for an ACT message.