The mile high club is a fun thing that some grown-ups like to do when they go on a plane ride. It means that they try to have a special kind of cuddle or kiss in the airplane's bathroom while the plane is flying very high up in the sky.
Flying in a plane is like being in a cool bird that can fly really high. When we're on the ground, we can see everything around us like buildings, trees, and cars. But when we're up in the sky, we only see clouds that look like fluffy cotton candy.
Sometimes, grown-ups who are on the same plane might think it's exciting to sneak into the bathroom together and hold hands, hug, or even kiss. It's like playing a game of hide-and-seek because they try not to get caught by the people who work on the plane.
It's important to know that not everyone thinks being part of the mile high club is a good idea. Some people think it's not respectful to other people on the plane or to the people who work on the plane. It's also not allowed by most airlines because it can be dangerous if people don't follow the rules. But for those who like the thrill of it, it can be a fun and exciting memory to have.