@742
Thanks for this input, could you elaborate, a link maybe?
Pull the historical wx data for a city in the northeast. Note the barometric pressure and visibility.
Or just read the contemporary news reports. The exceptional weather was often cited as a factor in the success of the attacks.
I live in the northeastern United States, and like all of us I remember that day. Weather-wise the visibility was truly unlimited, with a vivid blue sky. It would not have taken a Doctorate in Meteorology to realize that the temperature drop after sundown was going to be significant. The following days were similar.
Perhaps contrails will kill us all; I don't know. But I do know that making comparisons based on the weather on those days is a fool's errand simply because the weather itself was so exceptional, as was frequently noted at the time.