80kts,
Parts of the process were spooky on the DAL side. They had my payroll (sick time) records and full HR file from their subsidiary, plus my CP was there eating lunch. My info was already in Delta Security's database and my current Delta employee number is actually a recycled ASA number ... who knows what they were thinking, but there was a painting of the Delta Family Tree over in the Delta Offices that showed ASA and Comair merged into Delta and their brands disappearing. That disappeared (got painted over) when quite a few ASA pilots began to notice and they remodeled the space. In general, ASA (a publically traded Company with it's own marketing, code and tickets) was stripped of all of it's back office funtions and those jobs transferred to Delta (if you were a manager you transferred with longevity and some current Delta pilots did just that).
ALPA says Delta Management would have never merged their subsidiaries. Some of my friends in management who are now long retired stated, well, that was the plan (at least in the early days). My knowledge of that history isn't deep enough to make any definitive claims.
It would be interesting to know since thousands of people's lives were effected.