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The Airlines do make use of these data for planning et al. The
International Civil Air Organization in Montreal gatheers data aon the
number of passangers between all the airports in the world. The data
is quite useful for analysis. I have published analyis of these data
most recently in Global Networks and previously in NETCOM. They do a
very good job of predicting international internet flows and the
structure of the infrastructure of the internet.
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