I was at work in London. Someone came in with the news, without many details, and I said it must have been a light aircraft like the one that crashed into the Empire State Building in the 1940s (I was wrong about that one too, that was a bomber). Didn't find out what was really going on until later in the day.
The odd coincidence... two weeks earlier I was in Boston, and went to dinner with friends in a restaurant on the 30th or so floor of a building that seemed to be in the direct flight path from the airport, with a clear view out over the city towards the main runway. I remember saying that I hoped that the building had plenty of lights to warn off aircraft. That was probably the runway used for some of the 9-11 planes...
