The length per trip is defined as the length of a trip under the same flight number. For example, Air Tahiti Nui (www.airtahitinui-usa.com) TN21/22 Paris - Los Angeles - Papette has length of 15714km.

The triangular routes, like Cathay Pacific Hong Kong - Brisbane - Cairns - Hong Kong route (CX102/CX103), has its average length calculated as half of the length of whole triangular route. The route mentioned above has total distance of 13869km, and hence the laverage distance of 6934.5km.

The Air Tahiti Nui TN21/22 Papette - Los Angeles - Paris route is probably the longest route in the route based on calcuation method above.

And UNI Air (the domestic wing of EVA Air) (www.uniair.com.tw) Taitung - Ludao (Green Island) route, which is only 43km and flight time of only 15 minutes with Dornier 228 turboprop, is probably the shortest route in the world under the same flight number.

The average length per trip of an airline is calculated by adding the distance of each flight under the same number per week and then divided by number of flights per week.

Air Tahiti Nui, with all routes other than Papaette - Auckland route over 5000km in length, is the airline with longest average trip length.

And many domestic carriers, as well as low cost carriers, have short average trip length. UNI Air is probably the airline with shortest average trip length.