This has been suggested before - more than once. Every time, we get people who have run aeroplanes saying 'don't do it, it's too expensive', and those who haven't saying 'great idea - let me know when you start' and then disappearing into the woodwork. I can't find any of the relevent threads right now, but if I do I'll merge them in.
I have never heard of anyone doing this successfully (in financial terms). I would be delighted to be proved wrong.
Scroggs