I Can't imagine why a pilot would shut it down,,seems like a bad idea (unless you have a gun to your head) ,, did I hear recent talk about the possibility of a rogue crew?... that seems almost realistic in possibility at this late juncture ,,, crazy terrorist pilot type steals his own plane?I dowt they going to find this bird, but looks like it is going to influence changes, like the ability for pilot to shut off the transponders, This should not be a pilots option IMHO. the question of why does not out weigh the reasons of why not.