DAL themselves have made it public knowledge though that they are contracting out domestic-flying in favor of the more lucrative international routes - they have been busily expanding their international flying in the last year or so...they are the self-proclaimed "fastest growing international carrier."
I just find it a bit hard to think DAL mainline will take up that flying - number one, there is a bid out for it, and number two, they aren't attempting domestic expansion...quite the opposite??