Nowadays, any would-be hijacker is going to get immediately dogpiled and beat within an inch of their lives before they ever reach first class.
[1]: https://www.vox.com/2016/3/29/11326472/hijacking-airplanes-e...
https://en.m.wikipedia.org/wiki/Southwest_Airlines_Flight_17...
Post 9/11 everyone else just caught up (except minus the actually killing the person), see e.g. the shoe bomber guy.
Yeah. So much that, on the morning of 9/11, when a student in my college class was announcing there was a hijacking, I remember wanting to shout “Who cares? Those happen all the time and it gets resolved![1] Why is this a priority?”
… until he got to the part about it crashing into the WTC.
[1] Which, of course, still would have been out of line to say, but I was unusually cranky and didn’t get why that would be something to stop everything over.