Great circle distances data from CEPII

I have been using great circle distances for some work on both the environmental impact of aviation and to illustrate the growth in and pattern of international air transport to and from New Zealand.

My usual source for this data is Great Circle Mapper. However, recently I came across some data files of geodesic distances produced by the CEPII (a research center in international economics based in Paris, France), primarily for use in trade gravity modelling.