Summary of the Regional Council's decision process relating to amending the Metropolitan Transportation Plan to include a third runway at Sea-Tac International Airport with additional noise reduction measures

This 1996 Puget Sound Regional Council document summarizes the multi-year planning process behind the decision to add a third runway at Seattle-Tacoma International Airport. It traces efforts dating back to the 1988 Regional Airport System Plan through environmental reviews, expert panel evaluations, and feasibility studies, concluding that no viable alternative sites or demand-management strategies could eliminate the need for the new runway. The approval was conditioned on additional noise reduction measures to address impacts on surrounding communities.

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This document summarizes the Puget Sound Regional Council’s decision process for amending the Metropolitan Transportation Plan to include a third runway at Sea-Tac International Airport. It covers the history of regional aviation planning from the 1988 Regional Airport System Plan through the Flight Plan Project, Sea-Tac Master Plan, and Expert Panel evaluations of demand/system management and noise conditions. The document traces how conditions set in Resolution A-93-03 were evaluated, including the finding that no feasible supplemental airport sites existed in the four-county region.

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