The Port of Seattle's Late Night Noise Limitation Program tracks aircraft noise between midnight and 5 a.m. at four monitoring stations around Seattle-Tacoma International Airport, using single-event level (SEL) decibel thresholds for both arrivals and departures. Noise limits vary by monitor location, ranging from 82 to 91 dB SEL, and airlines' compliance affects their scores in the annual Fly Quiet Award. The Third Quarter 2019 results were presented to the StART advisory group on October 23, 2019.

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This Port of Seattle presentation covers the third quarter results of the Late Night Noise Limitation Program, which monitors aircraft noise between 12am and 5am. It outlines SEL noise thresholds established at four noise monitor locations (SEA12, SEA13, SEA18, SEA19) for both departures and arrivals, and notes that results affect the Annual Fly Quiet Award scoring.

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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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