4.2.2.2.3 In the case of a flight through intermediate stops, where flight plans for each stage of the flight are filed at the first departure aerodrome, the following procedure shall be applied:
a) the air traffic services reporting office at the first departure aerodrome shall:
1) transmit an FPL message for the first stage of flight in accordance with 4.2.2.2.2;
2) transmit a separate FPL message for each subsequent stage of flight, addressed to the air traffic services reporting office at the appropriate subsequent departure aerodrome;
b) the air traffic services reporting office at each subsequent departure aerodrome shall take action on receipt of the FPL message as if the flight plan has been filed locally.
4.2.2.2.4 When so required by agreement between the appropriate ATS authorities to assist in the identification of flights and thereby eliminate or reduce the need for interceptions in the event of deviations from assigned track, FPL messages for flights along specified routes or portions of routes in close proximity to flight information region boundaries shall also be addressed to the centres in charge of each flight information region or upper flight information region adjacent to such routes or portions of routes.
4.2.2.2.5 FPL messages shall normally be transmitted immediately after the filing of the flight plan. However, if a flight plan is filed more than 24 hours in advance of the
IX. Air Traffic Services Messages
estimated off-block time of the flight to which it refers, that flight plan shall be held in abeyance until at most 24 hours before the flight begins so as to avoid the need for the insertion of a date group into that flight plan. In addition, if a flight plan is filed early and the provisions of 4.2.2.2.2 b) or e) or
4.2.2.2.3 apply, transmission of the FPL message may be withheld until one hour before the estimated off-block time, provided that this will permit each air traffic services unit concerned to receive the information at least 30 minutes before the time at which the aircraft is estimated to enter its area of responsibility.
4.2.2.3 Delay (DLA) messages
4.2.2.3.1 A DLA message shall be transmitted when the departure of an aircraft, for which basic flight plan data (FPL or RPL) has been sent, is delayed by more than 30 minutes after the estimated off-block time contained in the basic flight plan data.
4.2.2.3.2 The DLA message shall be transmitted by the air traffic services unit serving the departure aerodrome to all recipients of basic flight plan data.
Note.— See 4.2.3.4 concerning notification of a delayed departure of an aircraft for which a CPL message has been transmitted.
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