jongar, there are many universities that offer degree programs in airline management. If you have completed one of these please share it with us, otherwise your opinion of how many crew are needed to run a scheduled airline is no better than an uneducated guess. Most airline ops managers would tell you that in order to run a scheduled service on a long term daily basis you need about 5 crews per a/c. This takes into account many things like using the a/c as mush as possible, leave, sickness, recurrent training, I could go on, you get the idea. Now as we have been trying to tell you, some flights need augmentation. Where do you think you get the third pilot from? Some airlines that do a lot of long haul have a lot more crew per a/c. Face it, you are in over your head mate.
As for your thoughts on the seniority system, it works to the company's advantage as well. When a pilot has invested a few years on a seniority list he is reluctant to leave and start at the bottom elsewhere. This makes him sort of trapped by the system which can lead to abuse by management. There are two sides to every story. The seniority system works well for us, it keeps everyone honest and you always know where you stand. Promotion is based on merit, it's the opportunity that is based on seniority. It also keeps the right seat from getting stale, bitter and twisted.