Someone mentioned that the use of Air Marshalls is the best idea. I agree.
Someone mentioned the use of CC spary as a non-lethal means of stoping a dangerous and or violent situation. I disagree. Remmember that All airlines have Airconditioning vents and by utilising this toy, it will have an enormous impact on the passengers, f/a and more importantly the Pilots. It will circulate.
Keep the air marshall and train the f/a's to improve thier skills in detecting sus activity..
Enjoy.
jonboy80