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b)  not more than two operational control units con-cerned,

such addressees to be specified by the operator or his designated representative.
2.1.1.5 When so requested by the operator concerned, movement messages transmitted progressively between air traffic services units concerned and relating to aircraft for which operational control service is provided by that operator shall, so far as practicable, be made available immediately to the operator or his designated representative in accordance with agreed local procedures.
2.1.2 Use of the AFTN
2.1.2.1 Air traffic services messages to be transmitted via the AFTN shall contain:
a)  information in respect of the priority with which it is to be transmitted and the addressees to whom it is to be delivered, and an indication of the date and time at which it is filed with the aeronautical fixed station concerned and of the Originator Indicator (see 2.1.2.5);
b)  the air traffic services data, preceded if necessary by the supplementary address information described in 2.1.2.6.1, and prepared in accordance with Appendix 3. These data will be transmitted as the text of the AFTN message.
2.1.2.2 Priority indicator

2.1.2.2.1 This shall consist of the appropriate two-letter Priority Indicator for the message as shown in parentheses for the appropriate category of message in Section 1.
Note.— It is prescribed in Annex 10 (Vol. II, Chapter 4) that the order of priority for the transmission of messages in the AFTN shall be as follows:
Transmission Priority Priority Indicator

1  SS 
2  DD  FF 
3  GG  KK 

2.1.2.3 Address

2.1.2.3.1 This shall consist of a sequence of Addressee Indicators, one for each addressee to whom the message is to be delivered.
IX. Air Traffic Services Messages
2.1.2.3.2 Each Addressee Indicator shall consist of an eight-letter sequence comprising, in the following order:
a)  the ICAO four-letter Location Indicator assigned to the place of destination;
Note.— A list of ICAO Location Indicators is contained in Doc 7910 — Location Indicators.
b) i)  the ICAO three-letter designator identifying the aeronautical authority, service or aircraft operating agency addressed, or
ii)  in cases where no designator has been assigned, one of the following:
—  
“YXY” in the case where the addressee is a military service/organization,

—  
“ZZZ” in the case where the addressee is an aircraft in flight,

—  
“YYY” in all other cases;

Note.— A list of ICAO three-letter designators is contained in Doc 8585 — Designators for Aircraft Operating Agencies, Aeronautical Authorities and Services.
c)  i) the letter X, or
ii)  the one-letter designator identifying the department or division of the organization addressed.

2.1.2.3.3 The following three-letter designators shall be used when addressing ATS messages to ATS units:
Centre in charge of a Flight Information Region or an Upper Flight Information Region (whether ACC or FIC):
—  
if the message is relevant to an IFR flight ZQZ

—  
if the message is relevant to a VFR flight ZFZ

Aerodrome Control Tower  ZTZ
Air Traffic Services Reporting Office ZPZ

Other three-letter designators for ATS units shall not be used for that purpose.
2.1.2.4  Filing time

2.1.2.4.1 The filing time shall consist of a six-digit date-time group indicating the date and the time of filing the message for transmission with the aeronautical fixed station concerned.
2.1.2.5  Originator Indicator

2.1.2.5.1 The Originator Indicator shall consist of an eight-letter sequence, similar to an Addressee Indicator (see
　
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