“I know it’s just me, but I happen to think that airplanes would be safer if ~everybody~ on board had a knife (or insert weapon here).”
You’ll laugh, but when I fly (not often) I always carry a couple of verrrrry sharp pencils with me. Husband does the same. A very sharp pencil will go right into something ... soft.
Aim for the wind pipe!
I always fly now with a good, strong piece of rope or shoelaces in pocket, just in case.