I was home, recovering from a work injury. I had got in the habit of doing internet while watching Fox and Friends, though I hadn't found FR yet.
I was watching when E.D. Hill said that there was news of a small plane hitting the WTC, and the reportage of this "accident" continued until the second plane went in. I knew, then, and I think so did everyone else. I called my mother, who lived elsewhere in the state, after the second plane to get her to turn on the TV, and we called back and forth a couple of times during the morning.
My sister, who lived in Finland at the time, was visiting our mother; they had just been to visit me, and my sister had brought one of her Finnish friends to try to match up with me (it didn't take, and she and I are happily wed to others today), and they were back at Mom's, getting ready to fly back to Finland on the 12th (which obviously didn't happen...they got out 3 or 4 days later).
This friend was a structural engineer by trade. During either the first or second call, before it happened, she said "those buildings will fall; they cannot stand." We asked "how will they fall?" Fearing for those caught under them falling like trees. "Probably straight down," she said. So when it happened we were not terribly surprised, and I was immunized against all of the "deliberate demolition" conspiracy theories before they appeared.
Wow, I knew it would fall eventually, but that was hours later just before it happened. But my head envisioned them toppling, but I’m not an engineer