2.1.2.6.1 The following supplementary information is required when, in the Indicators of the Address and/or Origin, the three-letter designators “YXY”, “ZZZ” or “YYY” (see
2.1.2.3.2 b) ii) above) are used:
a)  the name of the organization or the identity of the aircraft concerned is to appear at the beginning of the text;
b)  the order of such insertions is to be the same as the order of the Addressee Indicators and/or the Originator Indicator;
c)  where there more than one such insertion, the last should be followed by the word “STOP”;
d)  where there are one or more insertions in respect of Addressee Indicators plus an insertion in respect of the Originator Indicator, the word “FROM” is to appear before that relating to the Originator Indicator.
Note.— ATS messages received in teletypewriter page-copy form
1)  ATS messages received via the AFTN will have been placed within a communications “envelope” (preceding and following character sequences which are necessary to ensure correct transmission via the AFTN). Even the text of the AFTN message may be received with words or groups preceding and following the ATS text.
2)  The ATS message may then be located by the simple rule that it is preceded by an Open Bracket, e.g., ’(’ and followed by a Close Bracket, e.g., ’)’.
3)  In some local cases, the teletypewriter machines in use will always print two specific symbols other than Open Bracket and Close Bracket on receipt of ATS messages constructed as prescribed in Appendix 3. Such local variants are easily learned and are of no consequence.
2.2 Preparation and transmission of messages

2.2.1 Air traffic services messages shall be prepared and transmitted with standard texts in a standard format and in accordance with standard data conventions, as and when prescribed in Appendix 3.
2.2.2 When messages are exchanged orally between the relevant air traffic services units, an oral acknowledgement shall constitute evidence of receipt of the message. No confirmation in written form shall therefore be required.
Note.— See Annex 11, Chapter 6, regarding the requirement for recording of direct-speech communications.
3. Methods of message exchange

3.1 The lead-time requirements of air traffic control and flow control procedures shall determine the method of message exchange to be used for the exchange of ATS data.
3.1.1 The method of message exchange shall also be dependent upon the availability of adequate communications channels, the function to be performed, the types of data to be exchanged and the processing facilities at the centres concerned.
3.2 Basic flight plan data necessary for flow control procedures shall be furnished at least 60 minutes in advance of the flight. Basic flight plan data shall be provided by either a filed flight plan or a repetitive flight plan submitted by mail in the form of a repetitive flight plan listing form or other media suitable for electronic data processing systems.
3.2.1 Flight plan data submitted in advance of flight shall be updated by time, level and route changes and other essential information as may be necessary.
3.3 Basic flight plan data necessary for air traffic control purposes shall be furnished to the first en-route control centre at least 30 minutes in advance of the flight, and to each successive centre at least 20 minutes before the aircraft enters that centre’s area of jurisdiction, in order for it to prepare for the transfer of control.
3.4 The second en-route centre and each successive centre shall be provided with current data, including updated basic flight plan data, contained in a current flight plan message or in an estimate message supplementing already available updated basic flight plan data.
　
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