Let me tell you something about weapons: every passenger has two of the most deadly weapons with himself or herself every time they board a plane, being their two hands.
Trained and conditioned, the hand is a swift and silent killer; the index finger can stun,
immobilize, or kill; the heel can break or kill; the thumb can do all these and more.
Almost anything can become a weapon when used
as one.

Marshals are one darn good idea as are the
others from Professor Moriarty.