Outstanding !!! your a hoot,
Let me keep it simple then, cost sharing is covered in airlaw 101 for PPL's. Every PPL should know it without asking....that's my point.
As for your comment that inexperienced PPL's would do what an instructor would do ...eh? Well hey, . I'll be sure to tell every inexperienced PPL I meet that it's ok to fly from the RHS and just to do what an instructor would do.....if it doesn't work out call llanfairpg..
