If you ever traveled on an airplane, you must have noticed small holes in the windows. Ever why wondered why these holes exist? Oh, damn! I can only imagine the panic you must feel at this very moment. Worry not! The hole is not planned out to get you sucked out in the open air, 30,000 feet above the ground. But, if it’s not a well-planned conspiracy of murdering you, then why? Oh, well this is exactly why!


We all know that air pressure is extremely low at an altitude as high as 35,000 feet. In such low pressures, anyone would pass out if they were exposed to such pressures. Thus pressure is created inside the plane, to a greater extent compared to outside air.

This pressure is fine for passengers, but not for the airplane. In this case, the plane needs to have an outlet to release a certain amount of strain. The tiny holes known as bleed holes play an important role in keeping the plane safe at an enormous altitude.

A window is usually made of three durable panes. Mark Vanhoenacker, a British Airways pilot, explains that the innermost pane serves as a protection for the second and third panes, which are “designed to contain this difference in pressure between the cabin and the sky.”


The bleed hole balances the pressure between the cabin and the gap between panes. They also help to release moisture and reduce the frost or condensation that usually blocks the view.


    • Breather Hole, The hole is there for maintaining the pressure in the cabin. They are used to regulate the air pressure that passes between windows inner and outer panes.
    • Fog Free, The breather hole also keeps the window fog-free by absorbing moisture that gets stuck between the panes.
    • Safety Feature, It turns out that the tiny hole in the bottom of your airplane window is actually a very important safety feature.

    So now you know it well, why the bleed holes are present. The next time if anyone tries to block these holes through their fingers, you can stop them by explaining with logic!

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