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I think per travel time would be better. "Trips" in air and automobiles tend to be of very different average durations.

Car risks grow linear with length of trip while plane risks are concentrated especially at takeoff and landing. If you only count deaths/trip, it would discount much relevant information.

I too think we should reinvent the discipline of statistical analysis in this thread.

For example, richer people fly, should we adjust for that?

I love these dim headlines