From the clip you have learned that planes need lift to stay airborn. Lift is created by aerofoil shape of the wings.
To proof that you understand the principle of lift you are going to create an animation on the working of a boomerang. You can use any sort of stop motion animation to explain why the boomerang stays in the air and comes back when properly thrown.
The help you in your research, here is a tutorial on how to make a roomerang.
try it its fun and really comes back.