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Explained in plain English

Why do plane windows break?

Aircraft windows are usually made of strong acrylic, not glass, and have multiple layers to maintain cabin pressure. A rare failure at 20,000ft, as happened to Ljubisa Karovic, would be extremely serious. Modern planes are designed with safety redundancies, so such incidents are investigated thoroughly to understand the cause and prevent future occurrences.

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Who inspects planes? Are ADs always urgent? Airline's duty of care? What is an airworthiness directive? What is an audit? What causes ADs? Who checks the rules? What happens at 20,000 feet?

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