Airplane Window Holes Are Real
If you’re an avid window seat occupier on airplanes, then you’re probably familiar with those little holes you see on the windows. Have no fear! They are there for two good reasons.
The first reason is to compensate for air pressure, so when the plane reaches cruising altitude, there is a huge pressure difference between the inside and outside of the plane – as you can tell by your ears popping. The hole regulates some of that difference so the outer window doesn’t have to do all the work. The other reason is that it prevents the windows from fogging up.