I am a check-captain and instructor...
Therefore often happens that I operate as the F/O on some flights.
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My personal preference is to give a line check (or simulator check) from a jump seat, rather that occupying a position as required crewmember. I see differences with some captains having "a real" F/O, or in having me occupying the RH seat...
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Probably psychological... honest, no difference for me.
Since I am management, I am not on regular flight crew roster, and I am permanently "reserve"... so I accept any flight given, rather than flying a desk in the office, or bored to be home. And I know that many captains do request me to go along with them if their favorite F/Os are not available...
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I am lucky if I fly one or two trips per month...
And I even ask to make a landing as well... Rusty old fart here...
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Happy contrails
