Why is he obsessed with this, was he supposed to be on the plane or something?
I think now we know how these flights ended, most would be doing something about it. I’m sure these guys were cool and calm and reassuring everybody they were going to be alright. I mean, before that happened, who ever thought of being on a plane being used as a missile?
Yes - at least that is what has been alleged about Wahlberg. I read that online more than once. It may have even been on his IMDB page at one point, but I did for sure read it online. Whether or not it is true is another story.
Speaking of Mark Wahlberg - he looked great in "FEAR" [1996] with Reese Witherspoon. She was in the movie "Legally Blonde" in 2001, which came out in theatres only a month or two before 9/11.
If anyone has watched the movie, you may recall the scene where she pretended to be extremely attracted to one of the geeky/nerdy guys.
It turns out that his mother passed away on one of the hijacked 9/11 planes.
The DB Cooper case was the last example of a person who managed to hijack a plane for the sake of acquiring a ransom. I happen to love the original Unsolved Mysteries series with Robert Stack [season one of a rebooted version of UM has just completed filming], and this 1988 episode that featured DB Cooper was really good [IMO]:
Interesting that the last successful example of a plane being hijacked for a ransom happened in 1971, just days before Mark Wahlberg turned six months old.

As to whether or not he - or anyone - would have fought...I hadn't thought of it the way that rocket presented it:
Generally, you think that by cooperating with perpetrators of crime, that they will let you survive. That is not always the case though - for example, with Ted Bundy, he tended to not attack women who fought back. I guess he wanted them to be crying and be engaging with him in a submissive way, as per his sick sexual fantasies. Apparently when women fought back, Ted Bundy would flee.
So in that case, fighting back was a good thing, although in other cases, such as the Connecticut River Valley Killer, he stabbed Jane Boroski 27 times, before finally stopping - and he only finally stopped because Jane stopped fighting back.

That case is so sad...it was another case that was covered on Unsolved Mysteries, and is currently on YouTube, if anyone is interested [Unsolved Mysteries with Robert Stack - Season 4, Episode 4 - Full Episode]. The fact that that case is still currently unsolved makes it even more sad.