“What I was doing, and the sky, which was crystal clear blue.”
And eerily quiet. I live on the flight path for landings/take offs for my local airport. I remember being so saddened by the silence that afternoon and for the following days. I rejoice at the “terrible noise” today.
“Severe Clear on 9/11”
http://www.forbes.com/2008/09/10/terrorism-anniversary-pentagon-oped-cx_db_0911burlingame.html