I've done a fair amount of Internet research to try and satiate my curiosity, but I haven't been able to find the exact numbers I'm looking for.

I'm interested in understanding the distribution of air miles flown (domestic, intl, or both) across the U.S. population? I know I've read something like 15% of Americans have never flown before.

I'm sure that of the people that do fly, the distribution probably comes close to the Pareto principle (~20% of flyers fly ~80% miles flown)--pretty much consumption of anything comes close to that distribution. Ideally, I would like to find a distribution curve, but I haven't had any luck.

Any of you out there in the travel industry or travel marketing and know where I could find something like this? I'm not searching for any particular reason, just my own curiosity. It's something I've clearly thought about a lot ; )