I don't know. Take 14 young strong middle eastern men and have them clog up the aisle in front of the cockpit. Two of the men could go to the cockpit and the remaining me could act as buffers for anyone who did fight. They could use the plane as a missle again. The only real line of defense would be air marchals and the pilots. I'm sure the pilots would crash the plane rather than have it used as a missle. BTW, I wouldn't put much faith in the best effort of a liberal to fight off anyone. It isn't in their nature.
There was a report this week that the jihadis are testing onboard IEDs that would blow open the locked cockpit doors so they could gain entry. I'll see if I can find it.
With the few passengers who had the gumption to take action there would be no room for the marshals to get to the terrorists. That just leaves the pilots to fend for themselves. Is it any wonder they are begging to be armed?