From Delta's recent 8K:

"Consolidated unit cost (CASM 3 ), excluding fuel expense, profit sharing and special items, was 5.7 percent higher in the December 2012 quarter on a year-over-year basis, driven by the impact of capacity reductions, wage increases, and operational and service investments. GAAP consolidated CASM increased 9 percent."

The most recent contract may have been neutral to Delta. Cutting maintenance costs and salary at regional carriers, and stacking that value up on top of the mainline contract could be considered neutral from a CEO perspective. In other words, subtracting a $billion from them, and adding a $billion for us is neutral. I'll take that any day.