Yep, NetJest can get away with being a private operator in the US as the only people they fly are the people who have bught a fration of the airplane i.e the owners. However in Canada, they view that just a bit differently and have to fly to the more restrictive Commercial Ops rules.
However, that being said, a company out in Calgary has taken a stab at it (I believe if memory serves correctly its called Sprint) using the PC12 and recently small jets such as the Citation Excel and Lear 45.