It was the first game for the dev who made the near-runway terrain. She didn't know to make hitboxes (or that terrains are rough in WebGL), but we wanted to include it still because it made a nicer final approach than just the far ground terrain, and we wanted to include as much as possible from every dev who worked on it. Thankfully no-one contributed anything that weren't in the game designs, but with so many beginners, a lot of things (like colliders) weren't made for more than the plane, ground and runway.