Notwithstanding the months of vigorous negotiations and subsequent good faith participation in mediation efforts, the parties to this dispute are deeply divided: As is apparent from their respective proposals. Each does little more than to stack the deck for their own constituencies that are neither fair nor equitable. As will be discussed below, this Board has chosen a different approach, one that adopts a Ratio and Category basis, but with a simplified grouping of aircraft, a "Pull and Plug" adjustment mechanism that addresses attrition considerations, and a limited period of Conditions and Restrictions designed to deal with, among other things, fleet expansion and reduction.