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I know it exists because I used it once with a student -- which doesn't mean
I still have it (or that I remember where I got it it). At the time there was
nothing remarkably difficult about getting it.
It was point to point for a year with passenger as the unit of analysis.
One big validity problem: In the real world passenger passenger traffic is not
a monotone function of either distance or real traffic: There isn't much air
traffic (some but not much) between extremely nearby destinations: take a cab.
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