Why do airplane windows have those tiny holes at the bottom?

These tiny holes, also called breather holes, serve as a safety function, by making sure that the outer pane bears all the air pressure (the pressure inside the cabin is much higher than outside). This also ensures that in case the pressure difference becomes high enough, it is the outer pane that breaks off first.



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Known as “bleed holes”, they help regulate air pressure changes as planes climb to cruising altitudes of up to 33,000 feet. At high altitudes, air pressure and oxygen levels reduce.

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The first reason is your safety. If anything happens during a take-off or landing, your eyes will already be used to the day or night light outside, thus you will be able to react more quickly. Another reason for keeping the blinds open is visibility of aircraft outside.

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The inner pane basically safeguards the load from the passengers during flight. When both the outer and middle panes break, then all the pressurization in the airplane would escape leading to decompression in the passenger cabin. A plane is pressurized for passengers' comfort as it climbs to a higher altitude.

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Some aircraft damage from lightning strikes includes broken lighting and windows, deformed antenna placements, and onboard electronics malfunctions. Other abnormalities or warnings on the flight deck, such as cabin air pressurization problems or false alarms, can occur after your airplane has been struck by lightning.

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Airplanes naturally have less oxygen in the air than that of the ground air. Unfortunately, some people are susceptible to hypoxia when exposed to environments with low oxygen levels. To protect against hypoxia-related fainting, commercial airlines maintain cool cabins.

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Yes. On most passenger aircraft models, some cockpit windows can be opened. On the Airbus A320, for example, there are two windows that can be opened, one on the captain's side and one on the co-pilot's.

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