Well, you got me there and I already knew that... it just seems to me that in that case the phrase "Remote Controlled Airplane" would have been more appropriate.... and big ones like that have been around for far longer than quads...Please google the definition of "Drone."
A fixed wing UAV is a....Drone.
Sorry, I'm just annoyed that anything flying these days which isn't manned or a biological creature is now called "drone"... more hyperbole to confuse people.