What did you learn, what would you do different next time?

First I made three paper planes with different shapes such as standard, glider, and infinity. Second step is I have to get an distance in meters and test it out three of them how far they fly, but if the airplane is thinner then it will fly the furthest because it is more aerodynamic. The data shows that the thinner airplane fly the furthest by 8.22m compare to glider 5.18m and standard 6.42m. What I need to improve next time is by doing testing in the hallway instead of not doing it close to the stairway.