The tiny hole makes it so air can travel between the cabin, and the area between the two panes of plastic glass that airplane panes are made of, to equalize pressure.
![Credit](https://awwthings.b-cdn.net/wp-content/uploads/2016/10/main-qimg-6b50680bfa981ef80a63957050ed202c-c.jpg)
When you visit any web site, it may store or retrieve information on your browser, mostly in the form of cookies. Control your personal Cookie Services here.