I challenge you to try this!
I made up 4 Squirrels out of foam and went to a park. Lots of kids were around so I showed them how to fly the Squirrels. Some a couple kids (and big kids) already had Squirrels because of my previous activities.
There were only 6 planes in action.
When I left, I left th foam Squirrels behind so the kids could share them (minus one which landed on the roof).