Yeah, my replies weren’t very clear, sorry.

To get an open seat in the back (if any are available) during the boarding process then seniority rules within the same boarding priority (positive space non-rev vice space available non-rev, vacation passes over regular space available passes, etc.). Status, whether you’re a ramper or a pilot, doesn’t matter.

However, for a cockpit jump seat rider who is a pilot, seniority is the sole determining factor. A senior F/O would have priority over a junior Captain, for example.

I usually do EZE or GRU from IAH three or four times per month and we see pilot jump seat riders maybe 25% of the time, although the average is somewhat higher during South America’s summer season (now).