I was thinking maybe that's when that pic of the Luxor was taken, since it was done before the lights were added.
Atta was apparently all over the country, scoping out targets for future attacks. He reportedly chartered pilots to fly him over areas in Tennessee. There were others who were in Nashville who came under suspicion.....and, of course, disappeared right after 9/11.
This problem won't go away any time soon, so vigilance is one of our best weapons against terrorism. People such as those who have put their heads together at this thread may make a bigger difference than any of us will ever know.