April 1, 1982August 10, 2026

Preliminary Assessment of Airspace Interactions: Seattle-Tacoma International Airport and King County International Airport

Notes

Draft working paper prepared by Peat Marwick Mitchell & Co. for the Port Of Seattle in April 1982, providing a preliminary assessment of airspace interactions between Seattle-Tacoma International Airport (Sea-Tac) and King County International Airport (Boeing Field). Analyzes airfield capacities and aircraft delays at both airports, including effects of airspace interactions on those metrics. Assessment uses analytical techniques with broad-based assumptions to determine whether magnitude of airspace interactions warrants further investigation in a Phase 2 study. Topics include air traffic demand, aircraft mix, ceiling and visibility conditions, runway use, ATC procedures, FAA air traffic records, and the National Airspace System Plan. Tables cover annual and peak hour operations forecasts, monthly/daily/hourly distributions of aircraft operations.

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As the source for federal transportation grants, the Puget Sound Regional Council was charged with developing a system to meet the growing need for commercial aviation. When the search for a second airport failed, they authorized the Port of Seattle to build the Third Runway, with a mandate to develop a noise abatement and mitigation program. In their effort to stop the Third Runway, the ACC argued over every detail of the Port's efforts--including property buyouts and sound insulation. The dispute was meant to be settled by a three member Expert Arbitration Panel. This is their final report. It finds 2-1, that the Port's program was insufficient in several respects. Despite that, funding for the Third Runway was approved by the PSRC, and the 'Port Package' program, proceeded largely unchanged. Expert Arbitration Panel's final decision finding that the Port of Seattle had not shown sufficient reduction in real on-the-ground noise impacts to satisfy noise reduction conditions required for approval of a third runway at Sea-Tac International Airport. The majority decision concluded the Port's noise abatement programs were insufficient despite being impressive in scope.

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