To add to what other people said. Commercial jet fly too high so people would pass out, equipping a parachute is complicated and people would panic trying to get help from the personel, they most likely wouldn’t able to use the parachute correctly. In the end the chance of saving people with parachute is pratically zero, chance are the plane will be able to land or will start to dive from so high that people won’t be ablet to use the parachute anyway.
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