Have a guy that wants my experimental airplane. I plan to deliver it to him so he can familiarize himself with the plane before he flies it by himself. After delivery I plan to go with him to his bank and together with a bank officer wire my bank for the amount of the sale. Is this a safe way to do this? Can he stop the wire? Seems to be safer than a certified check for the amount, which I believe can be stopped. Any ideas here?