I think the MC is elected by the MEC, so they can only be recalled by the MEC. MC is a position often borne of horse trading between various factions within a MEC. The loser in the horse trading often doesn't bother to run officially once they realize they won't get enough votes from the MEC. To get rid of a MC, you have to find out who on the MEC agrees with you and mount a recall effort against the MEC members who don't agree. You also better have a new MC in mind who isn't part of the current MEC and isn't part of the political process to recall the other MEC members or it's unlikely that you'd get many to stick their necks out on a recall movement. This is why recalls tend to occur more often at smaller carriers with smaller MEC's. By no means an impossibility and it has been done at carriers with larger numbers than FDX, but it has to be a very coordinated process. The machinations of the process are one the reasons MC's can sometimes feel that they can say whatever they wish without impunity.