Btw. the chief counsel has answered the question whether you can loan someone a plane without them paying for it. As long as there is no obligation that they act as pilot of the plane to further YOUR interests, there is no problem: (letter to Hancock)
http://www.faa.gov/about/office_org...013/hancock - (2013) legal interpretation.pdf
http://www.faa.gov/about/office_org...013/hancock - (2013) legal interpretation.pdf