And for maintenance - Delta currently owns a CRJ100/200/700/900/ERJ/EMB-170 MX facility in CVG that can handle 200 aircraft, plus do heavy checks in-house. These FAA-certified mechanics have maintained Delta's DCI aircraft for years.
I'm sure Delta could slap "Delta" patches over their "Comair" patches, let them fly S3 instead of S3C, tell them they get profit sharing, and call it a day.
Delta's 70 CRJs plus Comair's 44 CRJs is way under what they are capable of handling. Or offer a small bonus to have them move to BOS, RDU, MCO, DTW, JFK, or wherever Delta wants to stage their CRJs. Nevermind, they're already there.
Plus, they're already kinda Delta employees.