imagine the plane slowly going down, not tumbling. It is not a nice feeling, because you are enclosed in tons of metal and you're not on your own. even though everybody else is panicking, there is no sound except for the turbine that roares hollow and far, far away. like a medieval mechanical sky-dome enclosing your world. But instead of crashing into the ground - the ground moves away and you will fall forever. The plane will vanish, the other people, the light and the dirt - all goes away, but you're still not in a soothing free fall, because even though you can't see anything, you fall in an enclosed space. You fall in your head.
somewhen you don't even realize anymore, that you're still falling. there is just the noise that grows and becomes holy. its the only thing to believe in, the only real thing. Its the only physical thing.
This sound doesnt have a reason, it doesnt explain anything. But for it being there, you're still alive.
I think, in the end, you will vanish as well. But that just an hypothesis.
I don't think, a lot of people ever touch the ground. When was the point of the plane to descent? Now I believe, it is way more important to figure out, when the plane left the ground and that is almost funny.