You cant compare a major airline to a "regional service provider". Its not brain surgery to buy a bunch of RJs and hire a slave-wage work force, and then have a major airline pay you to do thier flying. Of course Comair itself made money, as did Mesa, ACA etc. Would they make money if they were stand alone airlines that had to price, market, and manage a product? Probably not.
It doesnt matter how Comair itself is doing, how is thier parent company Delta doing? If Delta s&*t the bed so would Comair. Analysts are saying lately that DAL has placed too much reliance on regional jets, and they are losing alot of money.