- a circular line on the surface of a sphere formed by intersecting it with a plane passing through the center
- Distance [km] = Great Circle Distance [km] + 95 km
- circular flights and flights with a great circle distance shorter than 80NM between terminal areas are excluded.
- ‘distance’ means the great circle distance between the aerodrome of departure and the aerodrome of arrival plus an additional fixed factor of 95 km; and
- “distance” means the great circle distance between the aerodrome of departure and the aerodrome of arrival plus an additional fixed factor of 95 km;
- the average horizontal en route flight efficiency indicator is the difference between the length of the en route part of the actual trajectory and the optimum trajectory which, in average, is the great circle,
- The distance factor shall be obtained by dividing by one hundred the number of kilometres flown in the great circle distance between the entry and the exit point of the charging zones, according to the latest known flight plan filed by the aircraft concerned for air traffic flow purposes.
- If the exit and entry point of one flight are identical in a charging zone, the distance factor shall be equal to the distance in the great circle distance between these points and the most distant point of the flight plan.
- The Great Circle Distance is defined as the shortest distance between any two points on the surface of the Earth, which shall be approximated using the system referred to in Article 22.214.171.124 of Annex 15 to the Chicago Convention (WGS 84).
- for each aerodrome pair: ICAO designator of the two aerodromes, distance (= great circle distance + 95 km) in km, total number of flights per aerodrome pair in the reporting period, total mass of passengers and checked baggage (tonnes) during the reporting period per aerodrome pair, total number of passengers during the reporting period, total number of passenger * kilometres per aerodrome pair, total mass of freight and mail (tonnes) during the reporting period per aerodrome pair, total tonne-kilometres per aerodrome pair (t km).