Oh, dont get me wrong. I am not one of those folks tha tinstruct to build time. I do not like those kinds of instructors. I LOVE teaching. I used to be a school teacher. I mean even if I do become an airline pilot, I will still actively flight instruct. I will never let my certs expire. I was just saying I dont see how it will help you become a better 121 FO. Instructing i a valuable skill that makes you a better pilot. But I just dont see how it makes you a better airline pilot. Even talking about instrument skills. You arent the one shooting the approach. You are coaching someone else. So your skills will deteriate unless you get in a sim or something and manipulate the contraols yourself. Sitting in the right seat and talking someone throough a hold will help your situational awareness and help you plan and stay ahead of the plane but your motor skills arent being improved. But you all bring up some good points.