My prediction is that DL will keep as much of Comair through the reorganization process as is necessary since they secure DL's DIP loans. At the end of the reorg process, if it appears that DL might merge w/ another carrier or if there is still a need to pull down RJ capacity, Comair will be sacrificed since they are the only significant RJ capacity that DL can eliminate other than Mesa (which could disappear fairly early in the process.) ASA and Skywest capacity is pretty well locked up in a contract that is bankruptcy proof so DL's first hit would be to Mesa since there is no strategic value for keeping them, although they are the lowest cost producer. After that, Comair is on the hit list.
Purely my opinion