Non rev. travel is space available after all revenue is boarded & at my airline non revs are boarded by date of hire. You being a new hire would be at the bottom. Our airline space available is almost non existant at this time. With fare where they are you are almost best just to buy the lowest & not worry about it. As far as working for an airline it's not what it was in 1979 when I started.
But if you want to work for an airline, I will just say good luck.