You’ve flown often, but you might not know it!

The outer pane: Designed to withstand extreme pressure and temperature variations.
The middle pane: An additional layer of safety, equipped with the well-known bleed hole.
The inner pane: Located on the passenger side, it doesn’t withstand pressure but protects the other two panes from scratches and accidental impacts.
A small technical detail with a big impact.

This hole, however discreet, is an engineering marvel. Without it:

Pressure would build up between the panes of glass, leading to a risk of malfunction.
The moisture trapped in this space could cause condensation, obscuring your view.
Next time, you’ll know.
On your next flight, take a look at that small hole at the bottom of the window. Behind its discreet appearance lies a crucial device that ensures your safety and comfort thousands of meters above the ground. A detail that testifies to the ingenuity of aeronautical engineering.