I was listening to the
Delta Reorganization conference call from this Tuesday.
Mike Candle(?) mentions that DAL's pilot agreement required "a pre-merger-level of pilot block hours be maintained," which was contrary to US's proposal to remove "a substantial number of mainline aircraft."
So its probably a safe bet that most pilot agreements do adress the possiblity of a merger.
(At around the 1:28 mark, the Delta's COO goes on about how much attention the NY-based 767s are important to the direction they want to take the company. Dough must know something...)