What I remember most from that day, besides standing in my boss' office watching the tv, calling my brother, the screams and tears from the office below ours, and the images we saw over and over on TV ... is the silence.

With all air traffic stopped from Logan airport, the skies were silent for several days, eerily so. That made the sound of the patrolling fighter jets stand out even more.

Bright, beautiful, clear blue sky, but devoid of sound ...