MBA,
There have been numerous articles in periodicals such as the Wall Street Journal, New York Times, Flying Magazine, etc. Although these are all private companies there is if you can successfully do the research a good amount of info out there. You might want to do a search on Warren Buffett as his company, Berkshire Hathaway, owns EJA. There is also a book called The Buyer's Guide to Fractional Ownership that may help you. Good Luck.
Mr. I.