Is a single air Marshall more effective than an entire plane of passengers? Post 9/11 a plane full of people is not going to let a guy with a knife take contro

Is a single air Marshall more effective than an entire plane of passengers? Post 9/11 a plane full of people is not going to let a guy with a knife take control of the plane. It is pretty unlikely that one Marshall is going to notice a suspicious person versus the 12 people sitting within 6 feet of them.