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I literally thought about this on my flight a couple weeks ago, if the plane loses power in the air most people in the plane are just gonna go down with it. I imagine most if not all passengers have no idea how to properly operate a parachute.
Some chance would be better than none right? Don't they have parachutes that automatically deploy at a specific height?
At what cost though? Like a single parachute without an automatic release system costs hundreds, if not thousands. You multiply that by 150 and it’s infeasible. Now include an automatic deployment system, and we’re talking tens of thousands per unit. Not including maintenance and repairs, long-term storage costs, the added weight on the plane. All these costs would be added to passenger tickets at a markup, so that $450 flight across the country is now a $700 flight. The risk also still remains because of depressurization issues, even if you make it to the surface your blood might boil in your body and still cause you to pass.
Logistically, plane accidents that result in loss of life are so rare that it would make more sense to equip every car in production with ejector seats then it would to equip every plane seat with automated parachutes.