I always wondered if there would be any spiritual and paranormal activity taking place at the site. I live near Pittsburgh and there is a side of me that would love to go camp there for the night and see for myself. Generally where there were tragic deaths and so on, there are reports of paranormal activity. With so many souls passing that day, I’m sure there is a lot of energy at that site.
I’d tie a demon presence to the hijackers. Not to more normal citizens who perished.
And, a possessed hijacker who perished would leave a demon or demons with no place to go, so it or they would futilely hang around.