Punki - thanks for the laugh.
Just an idea, probably a silly one because I don't know the legal implications ... but can pax legally carry pepper spray on board the plane?
I remember a lawsuit in CA a few years back in which Humboldt police had been sued by logging protesters for rubbing pepper spray
directly into the protestors' eyes (ouch). A description of what it felt like:
"It's a lot like bobbing for French fries in a deep fat fryer. That's what it feels like when this chemical weapon is applied to your face."
http://www.cnn.com/EARTH/9710/31/pepper.spray.update/
Surely a blast to the face of a hijacker with some pepper spray would buy you some time to further your defense ... maybe allow flight crews to carry this on board? They could use it for air rage as well, or that crazy cheerleader in 37-F.