>So the passengers can't see how close they are to the ground during a crash??

On the opposite end of the spectrum, there was a joke about two blind pilots who knew exactly where and how to land because they had a very good ear to deduce the needed info from passengers' screaming. They were only afraid of one thing - "what if they get used to this and stop screaming?".

>>And whenever I heard "door" connected with the verb "board", it was about an abandoned or condemned house, where all the windows and doors were boarded. I wonder why would they do that to an airplane ;).