I flew the Heron for about six months out of KNVY/KBUR/KLGB/KLAS. The name of the company was FleetAir and they had two Herons used to shuttle people back and forth between the Hacienda Hotel in Las Vegas. I seem to recall that N3999A was one of the aircraft but I can't find any record of it when I google the N number. It was pretty rare to see any Herons operating in N America in those days.