j1b3h0
Line Up and Wait
That is only because they are tied into this union seniority thing. If they could hire captains directly from their competitors or the military, there would be no reason not to hire lower level worker bees.
As you probably know, that's one reason pilots are way underpaid, compared to other professionals...in a very real way, it's as if we are married to our employer. The inability to change jobs, without a severe lifestyle change, and of course, the Railway Labor Act...but that's a whole 'nother discussion.