Comair was an extremely profitable airline before Delta purchased it.
Comair and ASA or any other regional are only profitable because they are guaranteed one through their contracts with their mainline partner. When that mainline partner also owns you...is it really a profit???
I want you to take $10 out of your right pocket and place it in your left pocket. Did you just make any money? NO!!!! A Comair profit is offset by a liability on Delta's books somewhere else.