When you work for an airline, you are given a hire date. That means you started working for them on that day. Your hire day is the golden number. Pilots senoirity determines everything. What plane you fly, what kind of days off you get, everything. It is very easy to have a 777 Cpt. with 20-25 years senoirity. Let's say that 777 Cpt. was hired in 1970. O.k, you come along and get hired in 97. Well that Cpt. has 27 years of seniority on you, 27 years. He will get 1st. pick over you on anything, because he has been with the company longer. This refers to anyone in the airline industry on every level. Senoirity is gold to an airline employee. I should know, I was there.