always called the skipper 'captain'
or, if addressing both pilots (or all the cockpit crew if more than 2) i would always say 'good morning/evening gentlemen'
i suppose i was brought up to call the local bobby 'sir'
but a ship's skipper or an aircraft skipper deserves to be called captain,
most, if not all earned it.
i am amazed at F/O's who resent this term to their colleague.
any crew or ground staff who have an issue with that then they are in the wrong job.
i was assistant to station manager and in the good old days of smart uniforms i had 3 then 4 gold rings too (thin gold ones mind lol),
i was very popular as i was a gent and calm and respected everyone.
i'm not perfect but i had an easy ride.
