How are airplane windows designed?
An airplane window actually has three panels: an outer pane to deal with the air pressure difference; a middle pane with the bleed hole, the tiny hole you see, which helps balance the air pressure; and a thin inner pane, also called a scratch pane, which helps protect the middle and outer pane from damage from . Airplane windows are relatively strong. The main thing to know is that aircraft cabin windows are not made of glass but with stretched acrylic. You won’t be able to break an airplane’s window with your fist as it has 3 layers consisting of the outer, middle and inner panes.