Speaking of elevators, here's another vivid anecdote for you, OP:
[bolc]An elevator engineer in the south tower reports:[/bold]
"As we got into the sky lobby area, there were shuttle cars that had come up from the first floor from the lobby. I started to shut those down at that 44th floor. People in the local elevators coming down from the floors above in the second zone, now there were more people in fact coming down out of those elevators than there were going up because usually it’s a very busy time of the morning when people are coming up into the building. A lot of people were coming down out of those local cars, some of them were trying to get into the shuttle cars. I shut them down.
The shuttle cars were those cars that would run from a lobby up to a zone. They had three zones in the building. They had the first zone which ran from one to 42, then the second zone started from 44 up to 76, and the third zone started from 78 up to 110."
As I turned around to go back toward the core of the building in the lobby, the second plane hit, and that shook the building.
We heard the explosion and within a matter of seconds after that impact, I heard – and as well as everybody else heard – this noise, this increasing sound of wind. And it was getting louder and louder. It was like a bomb, not quite the sound of a bomb coming down from a bomber. It was a sound of wind increasing, a whistling sound, increasing in sound.
I’m looking from the lobby up to a mezzanine area or the second floor where they lined up all the people to go up to the rooftop, and I’m looking up expecting something, building parts to be coming down, because I wasn’t quite sure what that noise was.
But I found out later, when the plane came through the building, it cut the hoist ropes, the governor ropes, of (the) 6 and 7 cars, which was the observation cars.
What we heard was 6 and 7 car free-falling from the 107th floor and they impacted the basement at B-2 Level. And that’s the explosion that filled the lobby within a matter of two or three seconds, engulfed the lobby in dust, smoke.
And apparently from what I talked to with other mechanics, they saw the doors, the hatch doors blow off in the lobby level of 6 and 7 car.