When he sees an airplane flying by he gasps and then yells, "planes!" or "their it is!" pointing to the sky, then he adds, "cool."
It's so fun to sit and look out to our right, off into the distance, waiting for the moment a plane will fly into our view. Then we get to watch it continue it's flight path across the sky in front of us from our window.
Once a plane has gone by and we have a little break from seeing the next one, Max will yell, "Uh oh!" with a very distressed look on his face, "no planes, uh oh!" or "Oh no!" I think doing this might be as fun for him as seeing the planes. He gets all dramatic about it.
He loves airplanes and is always on the look out for them wherever we go. We'll be driving in the car and a very excited yell will come from the back seat, "Planes!"