Just got back to my hotel room in Europe with takeaway lunch, planning to sleep for the night's flight. Turned on the TV, which by default was CNN.
The breaking news was an accident that an aircraft had collided into the WTC. As the reporter covered the story live with the towers in the background, I watched another plane fly from the right of the TV screen, then a ball of fire coming out to left side of one of the buildings. The reporter kept talking about the first incident as she was unaware of what had just happened behind her.
Didn't get the rest I had intended that afternoon.