Every time these get referenced I think about the alert messages from servers[0] that got sent in the seconds after the first plane hit. It's chilling and makes it all very real for me. [0] https://news.ycombinator.com/item?id=4504035
One thing that's struck me during 9/11, the pandemic, and some other natural disasters I've been around (I wasn't in NY 9/11 but similar ripple effects that day) is this kind of eerie intermediary time when things are breaking down, but people aren't sure whether to go on as normal or might not even be aware of what's going on, etc. I feel like these 9/11 messages capture that really well if you know what you're looking at, and know the timeline of events.