Why would you be on the plane? This is getting it through security.
Get enough of them through security and one can eliminate security.
What happens next is no longer constrained by "what one can get through security."
But to answer your question more directly, an airplane is one of the few places where a zip gun could actually be effective as a firearm. The cockpit door is fortified. Is the galley bulkhead or the wall of the lavatory?
What about that period of time when one of the pilots has to use the lavatory and the 5'2" FA is guarding the front of the plane during egress and ingress? At that point you're relying on human tissue to prevent access to the cockpit.
Get enough of them through security and one can eliminate security.
What happens next is no longer constrained by "what one can get through security."
But to answer your question more directly, an airplane is one of the few places where a zip gun could actually be effective as a firearm. The cockpit door is fortified. Is the galley bulkhead or the wall of the lavatory?
What about that period of time when one of the pilots has to use the lavatory and the 5'2" FA is guarding the front of the plane during egress and ingress? At that point you're relying on human tissue to prevent access to the cockpit.