If you had only been blessed with the sense that was given unto the common Anvil you would understand that the universe of discourse is 'United States Hijackings' and that your link, while very linky, is completely useless, providing nothing in the way of contextual information.
You do understand that over 12,000 pilots flying commercial, passenger, aircraft carry firearms, right? That there exists a peep-hole in the door? That they are not actually flying the plane unless it is taking off or landing?
So yes, in your fantasy scenario, assuming the terrorist is not beaten to death with a scared father's laptop, or incapacitated with the taser of the air-marshal, somehow gets let into the cockpit (the pilots fully-aware of what is going on as they have had a chance to look) and it is an un-lucky chance that these particular pair of pilots is not packing...The terrorist will still get an escape-ax to the base of the spinal cord while focusing on one or the other (an Axe is standard equipment on *every* cockpit, to enable the pilots to shatter the glass, if necessary)
You must be a retarded, moronic, mouth-breathing, moron-of-morons, cared over by other like-minded fud-slinging, twit-talking, swill of bastardized, twice-removed-actually-smart people, if you think that the American people will sit still for what is, in their minds, certain death anyway.