As if your are not already your kiddo's super hero...
here is a link for one of the guys i have been following for the pre-made planes I do for our class. So far based on all the ones i have seen I believe he keeps it PG and on topic. These may be a bit too technical for our young pilots but you could rock their world by knowing how to make some of these for them. They will have a chance to fly many if not all in class, if they haven't already.
Excellent instructions for some challenging designs, "Foldable Flight" Channel, Kyle designs paper airplanes (he does offer a book and templates for sale but not obnoxious marketing) he does very good tutorials. Good pace, with little to no fluff. He claims to teach the coolest paper airplanes on the internet and I have not been disappointed. Some of these planes were quite technical and I was easily able to make them all (so far) with very little origami background knowledge to understand fold language and expectations and not nearly as much rewinding as I imagined. For the kids that want to get serious I find this to be a great channel.
Dart – Sky Piercer (Flies 150ft+), Glider – Vapor, Hang Glider Hybrid – Astral https://www.youtube.com/watch?v=68qG9xG6X04
Darts that go the distance - Guardian, Havoc, Alkonost (I found Alkonost to be the most challenging due to some squash and petal folds at the end) https://www.youtube.com/watch?v=rQ8i54TpONY