I was heads down at my desk on the 15th floor of a building on Park Place (near Church - two blocks north of the North Tower) getting the final deck ready for that morning's board meeting; my north facing window open as it usually was on such a spectacular summer day.
Had I looked out my window exactly 15 years ago, I would have seen the plane that seconds later I heard roaring past; it was quite notable as jets don't buzz NYC very often. That thought lingered only a moment before I heard (and felt) the explosion as it struck the building.
After 15 minutes of stunned gaping at the hole in the tower from our conference room, we went into evacuation mode after the second plane hit. Anticipating the closure of major transportation systems, I headed immediately to the subway and made it to Grand Central in time to catch the 10:07 out of the city. Spent the afternoon with a friend sitting at an outdoor table at a bar in Norwalk, CT, far, far away from any televisions. Didn't have the stomach for that until later that evening.