If you’ve ever been in an airplane, you might’ve noticed that there’s a small hole in the bottom of your window. If you haven’t noticed it before, look for it next time; it’s on every plane. If you have noticed it before, you might have wondered whether it should be there and whether it was safe or not. The hole is actually an important component of the window, and contrary to what you might have thought it did, the hole actually helps the safety of the window. In this article, we will be discussing the function of the hole and what it actually does.