You guys are wasting your time arguing here about the SLI. It is going to go to arbitration. Then it is completely out of your hands. If you can't come to an agreement yourselves then you are going to get hit with past precedence and right now that looks like relative seniority by equipment type. Also the standard has been set that if you don't bring a seat to the dance, i.e. being on furlough, then you go to the bottom.
They will more than likely stovepipe your seniority lists then ratio merge them based on size. Since UAL has 747's they may add a fence on that aircraft.