That's interesting but it looks like a solution in search of a problem.
Also, I question the guy in the black shirt's "expertise." He's got all the right qualifications and he might have experience in concealing weapons, but I don't think he's got experience in using edged weapons, nor do I feel that he's spent much time with people who have actually used edged/stabbing weapons on each other.
The notion of an air marshal whipping one of these out is beyond preposterous. In fact, I can't think of a worse weapon for the circumstance.
Outside of a few isolated circumstances, I doubt these people have ever used an edged weapon against another person nor do they have much experience in what happens and how people react when they're stabbed, cut, or hacked at with a knife or machete. I think they have some vague notions, but don't really know what it takes to immediately incapacitate someone with a blade. If they did, I think they'd quickly realize how absurd this notion is.
That said, that's a pretty cool blade.