As has been pointed out, the management in flight ops are American. And all things stateside are dictated by seniority. So as a new joiner to this wonderful company you will have a 3 year 24k bond hanging over your head and have to sit at the bottom of the seniority ladder enduring crappy rosters. But if you don't like it you can leave and pay off the bond
My PBS roster was very average to say the least, certainly not good enough to stop me looking around.