My five year old son really wanted to make a jet and this is what we came up with. We used an irregular pentagon, a larger triangle, a smaller triangle with one corner cut off, and a rectangle. Plus some star stickers for decorating. I drew the shapes on paper and he cut them out.
We glued it all together, decorated it with stickers, and attached a string so it was ready to hang.
He liked it so much we made six more!
Some aviation books you might like:
The Jet Alphabet Book by Jerry Pallotta
The Noisy Airplane Ride by Mike Downs
Airplanes: Soaring! Diving! Turning! by Patricia Hubbell