This is Appendix 3A from a City of SeaTac planning document, showing the Airport Activity Areas (AAA) map for the Seattle-Tacoma International Airport region. The map delineates Inside AAA, Outside AAA, Future AAA, and Addition zones, and was prepared by the City of SeaTac using data from the Port of Seattle and King County Metro Sound Transit, with a scale of 2,000 feet / 0.5 miles.

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This 2018 Interlocal Agreement between the Port of Seattle and the City of SeaTac establishes a comprehensive framework governing their cooperative relationship. It covers land use and development standards, transportation coordination, and permitting and inspections related to Sea-Tac Airport and surrounding areas. The agreement addresses topics including zoning designations, airport activity areas, transportation impacts, and dispute resolution.

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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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