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There are two main features on airplane windows which prevent them from breaking. First the windows are usually round. This allows the stress on the cabin to more easily flow around the windows and not build up in a corner as with a square window. Another feature is a small bleed hole located in the middle pane of the window. The hole in the window allows the air pressure from the cabin to bleed through it and relieve some pressure, and put stress on the outermost pane of glass, instead of the inner pane which is closest to the passenger.