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I'm surprised there wasn't any human or general guardrail around the calculation that would have flagged such a significant weight difference. No one looked at the passenger count and the weight calculation and thought "whoa, that doesn't look right?"

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> The bug was identified quickly in part because some flight crews noticed the weights didn’t seem right and asked for manual validation of the figures.

Actually there were such guardrails, so the system had multiple manual checks built in.

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