There's a very good reason why very few planes crash and why it's 99.9% safe at altitude for the plane.
It has nothing to do with just flying through so called thin air.
Anyone that's been on a jet plane will understand what's going on if they seriously think about it.
A little clue is in the very slight tilt of the plane. Anyone notice this?
Is it "tilt up"?
The more velocity the more higher.
When you are sat on a bus on a flat surface you feel fairly level, right?
When you are flying in a jet you never feel level. The planes nose is always tilted up very slightly in flight under cruise at achieved height.
It never fully levels out and here's why.
Have you ever been on a speedboat?
For that speed boat to stay afloat at speed it has to slightly raise out of the water to skim that water whilst the engines power through it.
The plane is a boat with wings.
It skims off the atmosphere below because it's past equilibrium of it above, meaning the atmosphere does not create and equal push against it as the resistance under it.
This is why planes do not just fall out of the air and why they are fuel sufficient at high altitudes and why their engines can work...because they follow the stream.
Get in your canoe and follow the stream.
This is why jets are at their most vulnerable on take off and landing, because they are basically using full thrust to dive or raise from the deep...like a submarine trying to raise from the deep using it's propellers, or diving it.
Only a flat Earth can allow jets to fly like this under the fuel load they have.
Planes are like sail boats with an engine at altitude.
They follow the swirl (stream).
They pick the best routes around the Earth's circle so they can play the speedboat surf.
You know water skiing?
That's what planes are doing at altitude,
This is why you feel like you're skimming the water when you're in a plane and also why you hit turbulence.
It's like hitting a rogue wave every now and then.
Have a real good thing about it.