>>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

What's to stop the terrorists from using the oxygen masks? Perhaps the crew would not put theirs on in time? What if the cockpit has already been compromised?

Not to mention any deleterious substances could be lethal to certain sesitive passengers.