Earlier quoted context omitted.
I like the idea of an "at your own risk" option, but it'll never happen. Since 9/11, a large part of the purpose of airport security is to protect uninvolved people on the ground (or at least in tall buildings), not just passengers. We can certainly debate whether that's necessary or useful (I'd argue that we could do far less than we currently do), but I don't think you'll ever get the public to agree to allowing ai…
To protect those on the ground, part of the option could be acknowledging that the military can take out your plane if it's hijacked.
Flight 11 was crashed 30 minutes after hijacking, 175 20 minutes, 77 about 45 minutes, and 93 about 35 minutes later. Even if you tighten the loop between a hijacking and getting a fighter jet in the air to counter it, it will still take you about 15 minutes at best to do it.
Then you're left with the problem of figuring out which one of the contacts on your military radar doesn't have a transponder. Go to a map like " rel="nofollow">https://flightaware.com/live/> and observe the Ohio/Pennsylvania airspace in the middle of the day. You have 15 minutes to figure out the hijacked flight, guess its flight path, and then order fighters to intercept it and shoot it down.
Quite frankly, if a plane gets hijacked in the Northeast, there is no way you can get a military jet to shoot it down in time.