In other words, if "seniority" and "longevity" are just different words for the same thing, US would have shut down in the mid to late 90's. It would have had about twice as many captains as it needed since every pilot had the "seniority/longevity" to be captain and no f/o's since no pilots had so little 'seniority/longevity" to still be f/o's...
Jim
You don't even know what you are trying to say anymore!!!
NICDOA
NPJB