https://www.siliconvalley.com/2020/02/18/a-private-plane-and-a-yacht-can-be-deducted-on-your-taxes-ask-the-lawyer/

Q: We are going through all of our records now as we get ready to do our tax return. We came across information that seems hard to believe, like a private plane or even a yacht deduction. Is that on the level?

A: Research indicates there is a deduction for a private plane, if the plane is either used for non-recreational purposes or leased to a flight school. In that event, the purchase price and costs of maintenance are valid deductions. This is known as “bonus depreciation,” which is applicable to business owners who invest in new equipment. In addition, you may find it amusing that one may be able to deduct his or her yacht on a tax return, if it is a second home (certain criteria applies, so consult your tax specialist, if you own a yacht).