Is there any way to find out whether this flight was operating under part 91 or part 135?
In the press conference Rosenker said it was a Part 91 flight.
"For an accident to take place at the end of a flight, in general, would seem to be indicative that the plane was not over gross and the weight and center of gravity were within tolerances," he said"
That seems a very strange claim to make. I would have thought it quite plausible that weight and/or balance issues would manifest themselves only in approach configuration and at low speed at the end of the flight. Aircraft can (and I suspect often do) take-off and cruise over weight without incident.