The Paper Airplane is pretty cool and can be used for a bit of fun but in my opinion it would be even cooler if it was controllable like the Animus Exto spell, it would be made a lot slower than it currently is to make it actually controllable and would still be passable from person to person. This would be a nice hint to the paper airplane in Order of the Phoenix which flies around the classroom. This new change would bring a lot more variety to the object.