Boeing Field is home to a selection of aircraft belonging to one of the planets more wealthy individuals. The founder of a large software company has his biz jets and helicopters, but he also has a Grand Caravan on floats. In common with his other planes, the registration ends with WM. I have no idea whether he was onboard for this flight or whether it was a currency trip for the crew. It is a nice-looking Caravan (they look so much better on floats) and I guess I won’t be getting a chance to photograph it again for the foreseeable.