ICAO Annex 10, Volume II
188.8.131.52.5 Flight regularity messages (priority indicator GG) shall comprise:
b) messages concerning changes in aircraft operating schedules;
c) messages concerning aircraft servicing;
d) messages concerning changes in collective requirements for passengers, crew and cargo covered by deviation from normal operating schedules;
e) messages concerning non-routine landings;
f) messages concerning pre-flight arrangements for air navigation services and operational servicing for non-scheduled aircraft operations, e.g. overflight clearance requests;
g) messages originated by aircraft operating agencies reporting an aircraft arrival or departure;
h) messages concerning parts and materials urgently required for the operation of aircraft.
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