On one site they collected 109 paper airplanes with instructions and videos - each model has a rating of speed, glide range and accuracy.
Difficulty: from "very easy" to "expert". You can build real fighters: Unite, which stays in the air for 31.2 seconds, and Firefly 5: it flies more than 90 meters.
And some planes can be equipped with an engine and turn them into a radio controlled model.
We are putting together our own air park - here.