In a world where 72% of the population has wings. Most don't learn how to fly until they are 16. Like driving, you need a license to fly. Those who don't have wings take these lessons anyway, as they sell elitras like cars. You sit in class, listening to your instructor Yammer on, about laws and etiquette. Your childhood best friend is clearly not paying attention and is busy slapping his buddy with the wrist of his giant left wing