Grumman G-21 GooseGrumman Goose airplane model. N780 is the original registration for the Fish &, Wildlife converted turbine Goose that was improperly attributed to McKinnon (he didn't actually "build" or convert it) and registered as an actual McKinnon model G 21G (it was not!),It was really a "Fish &, Wildlife Service" model G 21F but that "design" was never approved as such.,It was also later registered as N92MT, CC CTG in Chile, N86MT back in the US again, and