I know that there are members here that have close and terrible memories from that day. Things that they can't or won't share. It must be a great burden.
I was having a coffee break in the Technical Library at our R&D site in Strongsville, OH when Carol said that she heard from her daughter that a plane had crashed into a Tower. We dragged a large TV on a rolling cart into a meeting room and turned on the news. People gradually drifted in. IIRC we saw the second plane hit. (memory is fallible). The crowd got larger in the room, as we were all transfixed and quiet. When the first Tower dropped out of sight there was flurry of confused comments and then crying. At around the same time reports were coming in of a flight near Cleveland that had abruptly changed direction. I think that may have been United 93. Downtown Cleveland office towers were given evacuation orders, including our own HQ. So we got word to close our site as well and were dismissed. Can't remember if we saw the other Tower drop.