There are NO untrained or untested Professional Pilots.
There are plenty of untrained and untested Managers. If management is, as often mooted, an inate skill that supermen are born with, what are all the Management Colleges for?
In my not so humble opinion (excessive modesty and a shy retiring nature are my only faults) no-one should be in any managerial position unless they are qualified by both experience AND specific training.
So to answer the question: Yes, pilots who have the necessary personal qualities and have been given appropriate managerial training make good managers.
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Through difficulties to the cinema