The closest merger to this situation was Pan Am - National. There the furloughees got credit for longevity (for the most part). Arbitrator Gill, who is now the vice chairman of the NMB used some creativity is sewing those lists together. If DOH were actually the policy, then the plain and unambiguous meaning of DOH would prevail. But that's not the policy so nobody really knows. I suspect the combined list will look a lot like the Pan Am - National list with a combination of DOH, slotting and longevity and fences.