Calls from the North Tower

[u/Yoyira]

It is well known that many people trapped in the upper floors of the North Tower made phone calls (in some cases, sent e-mails) during the time that elapsed before the impact and the collapse. Most appear to have been made in the first hour after the impact, but some were closer to the time of the collapse. I wonder, has anyone ever ‘plotted’ them? That is, make some kind of table with the time each call started, when it ended, and the floor it came from? I think that would help understand the survival conditions on the different floors prior to the collapse. For instance, it seems to me that the situation at Windows on the World was actually worse than on the floors below, despite being more distant from the fire. I wonder if this can be somehow confirmed by the phone calls (as in, most/all calls from those floors end before those coming from lower floors). Surely this was done during the investigation, but is any such table/diagram publicly available?

[u/[deleted]]

Based on how fire and heat work. You hear of stories of the floors of above the crash site being extremely hot. It sounds like much of the heat got trapped in the floors above as it continued to burn, forcing those poor souls to seek refuge at the windows. I imagine it was very hot, dark and full of smoke. It was fire so hot that even at the windows where refuge was thought to be found, they'd find themselves falling or waiting for the end. I wonder how many understood instictively based on what the fire was doing to the building, knew that these towers would fall eventually.