LW20.... In the airlines I have flown with, normally observe the Captain flying the outbound leg and the F/O the return leg. This is not in any way a rule, just a general observation.
Suspect in the two Captain, two F/O crewing operation, the return Captain would forgo the leg to be the PM. Again, general feeling on the matter and my personal preference.
If only the two of us, usually have a look at the weather and destination to make sure the F/O limits not exceeded, then ask the F/O their preference. They are a much better judge of their "comfort level" than I.
Captains have a duty not only to the safe operation of the flight, but to assist the F/O to accumulate the experience and skills to be Captains themselves. Another observation. Usually find that the fellow or lady sitting next (or behind) me teaches me just as much if not more than I teach her/him
. Likely be approaching being a fairly capable airline Captain about the time I retire
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and the thread meanders on.....