SF/O
Depending, for some airlines, a SF/O may mean -a F/O that holds captain qualifications, or
was a captain in the past, on other equipment, or
high seniority F/O...
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Depending on which airline as well, some wear 4 stripes (in the case of captains who were qualified on other equipment)...
This is for the old saying "once a captain, always a captain"
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In my airline, a cruise captain (3 pilot crew) is called a SF/O...
And more important... a SF/O has a better paycheck -
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Stripes "culture" in some distant countries - note this...
A F/O (3 stripes) cannot ask a ramp agent (one wearing 3 stripes) to connect external power... he better have 4 stripes to convey that authority.
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You know why I love to fly freighters rather than passenger cattle planes...?
As soon as I am in the flight deck, I change to t-shirt and jeans...
And I dont have to shake hands with little boxes...
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Happy contrails