After you get through building it’s helpful to give the kids some flight coaching before they go outside. You still have their attention. It takes a bit of time for all the kids to get the message. Expect them to be very excited so you need to be patient. If you change setting it’s harder to make sure all the kids don’t make certain common mistakes.
Also, the planes will not break from flying. They are designed to tolerate strikes to the wall and ceiling and so forth.
-Throwing instead of a gentle push
-Not holding under wing (otherwise finger interference)
-Not pick up by propeller/nose (loss of winding, damage)