[The_Media_never_lie]

A low impulse person who physically attacks the crew should be rendered (at least) unconscious until they are removed from the plane.

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Sounds like a good idea. However, what is the best way to render them unconscious? What if they won't sit still to be rendered? The Spock neck pinch (Star Trek) would be a handy method to teach the flight crews.

[Carl Vehse]

Sounds like a good idea. However, what is the best way to render them unconscious?

One way is to quickly place a heavy object next to violent person's head.

No doubt there are other ways that may be useful depending on the circumstances.