http://www.bluehawaiian.com/tour_det...p?tgid=3&tid=8
They are charging an extra 35 US for a 45 min flight .
Based on purchase cost I would expect commercial rates similar to a Koala or Bell 407 , maybe 15% above b2/B3 rates. Of course it depends how much the customer is willing to pay for an extra seat and the type of work.
just read more of the page . seems they are not using the 8 place config ( can any one confirm this ) premium is just for lower noise more comfort and better view.