"The Bigger Weapon."
IIRC, a Niven story about some guy who pretends he's suicidal to deal with an attempted hijacking by a hitchhiker.
Actually, they've already talked about neg-G maneuvers, partial depressurization of the cabin, etc. in other forums - at least, one of the books you guys recommended (How Did This Happen?) pointed that out. Suggested that those procedures combined with air marshalls + secure cockpit seemed more likely to achieve the desired aims than the current "give the pilots guns" argument that everybody keeps having.
There are 10 types of people. Those who understand binary, and those who don't.