I loved making paper airplanes. There was a book I found at the library with lots of cool designs. My friends and I would experiment with different techniques, using paper clips or taping pennies to the nose for strategic weight balancing. We had a competition in school once to see who could get the longest hang time. Most people chose a design that is good for distance flying buy I favored one that is good for loops. I lucked out with a favorable wind that kept bouncing the plane back up into the sky beating all the other times by 30 or 40 seconds.