Them
Contributor
This is certainly true, for example, in medical residency programs -- with the SIGNIFICANT caveat that the relative beginners doing the teaching are closely supervised by people who are NOT beginners, which is not the case with scuba instruction.
Now look at aviation.
The recommended - almost required - path for a would-be airline pilot goes like this:
PPL (OW equiv, very loosely)
Instrument (AOW)
Commercial (required for any paying gig - requires 250 logged hours and age >= 18)
Instructor
At this point the pilot has 251 hours logged and starts doing 1:1 training of 0 hour students - people who just walk in off the street sometimes. They do that for 1250 logged hours or so (regional airlines typically won't hire anyone with less than 1500 hours) .
The average flight instructor is in his early 20s and has been the sole instructor for at least 20 pilots by the time he or she starts applying for regional airlines. Obviously those 20 must be able to pass tests administered independently but a 20 year old/260 logged hours CFI can OK a student pilot to fly solo on their own responsibility.
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