It's not only biz-jets. Over many years I've been amazed that as charges to XAA's have risen their active oversight seems to have reduced. It would seem that much of the standards enforcement has been passed to the operators. The airlines should have procedures in place to check their crews and maintain SOP standards etc. The XAA's should assess if these procedures are in place. The actual appplication and checking of those procedures is the responsibility of the airline. The airline writes its SOP manual, it's checking manual, its recurrent training schedule. These are approved. It is then their own responsibility to police that. At various intervals the XAA will check this is done. I think this is the current situation. Will others concur or correct me, please.