Several years ago when I raced cars we had a guy with his 3 year son running around on the track. Despite all the warnings we gave the Dad, he wouldnt controll his son. I was running Mod buggy when I hit the boy about 3/4ths way down the straight-a-way. Since the straight was right under the drivers stand we couldnt see the boy at 30+ mph and I took him out. Luckily he only ended up with a bloody nose.

Planes are far more dangerous and if the guy copped an attitude, so be it! You did the right thing.