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> Seriously lucky that the disintegration didn't take out vital hydraulics or fuel systems in the wing, or penetrate the pressurised fuselage.

It isn't luck. It is the result of millions of engineering hours spent on the development of highly reliable and resilient passenger aircraft, an emphasis on public identification and dissemination of design weaknesses, errors, and failures, and an unwavering focus by industry regulators on safety.

This is a particularly egregious failure mode and very hard to contain, but also one which a lot of design hours have been spent mitigating. They were very lucky to have suffered (apparently, as far as has been reported) no significant damage of any kind, but even an extremely egregious uncontained engine failure is frequently flyable because of the emphasis on redundancy in modern plane designs.

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