He asked what is the most junior --line holder-- and when was he hired.

How deep do regular lines go now with PBS? Before PBS it was usually the top 70% of a category were line holders, the bottom 30% reserve. But PBS and 92 hour lines changed all that so now there are much fewer reserves required to cover the flying.

I'm guessing (haven't looked closely at it) that in the MD88 or 717 it's probably 85% line holders, and only bottom 15% on reserve?