My wife has a home-based business and I'm studying for my CFI. I would like to buy a C150 and use it for some of her travels and to teach others in. I was wondering if anyone else has a similar situation and what they do for taxes. It would be nice to write off legitimate expenses but I'm not sure how to go about that. Do I just include it in my deductions? What about writing off the cost of the aircraft itself. Should I form an LLC and register the plane under it? Any advice would be appreciated.