On the ALPA side there are Ziplines and Negotiator's notepads, as well as some documents that became public round about the time of LOA's 47 to 50.
On the management side, you would be looking for "First Day Orders" which outline the priorities the bankrupt party would like to see honored.
An excellent outline for investigation is contained with this story which parallels ours in many ways.
FRONTLINE: can you afford to retire?: watch the full program online | PBS
news + public affairs player: video
Jump 8 minutes into "Insured United's Bankruptcy" for a good review.
I have it from three independent (former Senior Management) sources that bankruptcy was strategically planned for Delta as far back as 2001. Most on our level did not believe (and many still don't) that ours was a strategic bankruptcy. Perhaps not that ours could have been avoided, but Michelle and Leo plotted a course right into a predetermined outcome.