It was a beautiful day: That’s what I remember thinking. And it’s probably the first thing anyone who is old enough to remember it will tell you about it.

Seamless sky, what pilots call severe clear. Had to be. The men who brought those buildings down didn’t know how to pilot a plane beyond flying straight, so conditions had to be optimal. The day before, Sept. 10, it had rained. The next was a different story.

It had started promisingly enough. I was working on a piece about the 75th anniversary of the Chrysler Building – the favorite landmark of New Yorkers – and had a 7:30 a.m. interview with William Ivey Long, costume designer for the Broadway hit “The Producers,” whose designs for the show included a gown inspired by the building’s diadem top. Long was a terrific interview but soon excused himself for what he said was a busy day. Delighted with his remarks, I wished him joy of it. ...