How could I find out (I assume it would be a survey of the national population) how many of the 300,000,000 people who live in America have flown once in an aeroplane in their lives. They could be immigrants, they could be citizens, but they live in America and have flown once.
As stated in the other thread, I looked for such data and found none. I don't think anything has changed since???? The only thing now you are adding is immigrants.
I doubt you will find any such data available.
No Lieberma, you haven't quite read carefully or I still have not been clear. Now I am interested in Americans who have flown once, and before (and still) I focussed on global percentages.
There must be someone, at some time, who wondered about the percentage of Americans who have flown. And had the money to ask a selected sample. Maybe not.