I was at work. I remember just wanting to get home, to check on family and get away from Philadelphia. When my company let us go, shortly after the second plane hit the second tower, there were still planes unaccounted for - several that were later discovered safe and sound, one that ended up in the Pentagon, and one that ended up in a field in PA - and I had a half incredulous, half serious fear of one of those missing planes. Incredulous because of course, how could that happen? Serious because it just had, four times.