[seek3r]

Interesting idea. I like that people are thinking "out of the box". Here are some problems. 1) A wet cloth over mouth and nose would provide terrorist with protection from the gas, and possibly put everyone asleep except for him. As a terrorist, this could be a bonus 2) Some passengers could have allergic reactions to the gas and be killed a a result. So if pilot (in his safe space) hears some commotion, which is just some drunk guy, and he panics and hits the gas the passenger button. If #2 takes place as a result, there would be lawsuits to contend with.