Groom them and talk them into coming with them outside the plane, for example. Having been on the receiving end of that stick (not on a plane, but still), I'd ask you reconsider how easy it is for an adult to have power over kids.
Fair point, I would have assumed that even a long-haul flight isn't enough for that to really make any difference and therefore be a waste of a predator's time, but I'll bow to your experiences