There is no standard. What I see around here is 15%. But it can be
anything. I know of a deal where the FBO pays all the costs of the
airplane, then the FBO gets $15 per hour and the owner gets whatever is
left. Now THATS a deal for the owner!! But that one is unusual. The
insurance is a killer. Someone should sell insurance by the hobbs hour
instead of by the month. That would help.