I was driving to work and listening to the radio. Initial reports were that a twin-engine plane hit one of the towers. I immediately knew something was wrong because any pilot worth a lick would ditch that plane in the Hudson or even somewhere on the ground rather than hitting a tower. Surprisingly, I instantly thought of Bin Laden since he tried to bring the towers down in 1993, I believe it was.
When I got to work our CEO made an announcement that it was business as usual and if we were spending time looking up stories rather than doing our work we would be fired. Oh well, I looked anyway. At first you could find all sorts of breaking news stories, but the weird thing is that a couple of hours later nearly every story was taken down from the internet.
Other than the complete shock and sadness of what happened, what struck me as the most odd was that for four days no planes took off from the airport. I lived in the direct flight path of a major FedEx hub, so not hearing their DC-10s at all was almost surreal.