Airplane windows are made of stretched acrylic, not glass, since it's both stronger and more lightweight than glass. Airplane windows need a strong and lightweight material to ensure they aren't easily cracked or broken, as a cracked or broken window could cause an emergency by reducing the pressure and oxygen levels of the plane.. Keep reading to find out why airplane windows are round. Get Reader's Digest's Read Up newsletter for more travel, fun facts, humor, cleaning and tech all week long.

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