I read RayBergman's book "Trout" and he calls flies lures lot of times. To me, the line between fly and lure is pretty vague and fuzzy. Although flies are generally made principally of hair, feathers and their synthetic counterparts there are also flies made mainly of epoxy, foam or some other form of plastic. And there there are lures, bucktail and marabou jigs pop to mind, that are mainly made of hair or feathers. So what does it matter, in my opinion, not that much. If you throw it with a fly rod most of the time I'll call it a fly. If you throw it with spinning tackle most of time it's a lure.