>Just speculating... what about a fast acting non lethal gas which would render both attackers and passengers unconcious. the Pilot upon being alerted to an emergency would deploy the gas to the passenger compartment and the cockpit crew would immediately put on gas masks, or seal the cockpit.

Glenn,

I think JimN or Evan suggested this recently. I think it's a good idea. Not sure why Jeff thinks it's a bad one.

Renoir