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The Regional Aviation Baseline Study, published by the Puget Sound Regional Council in June 2019, examines the roles and interactions of 29 airports across the central Puget Sound region, including Sea-Tac as the area's primary large hub. The study aims to provide a regional perspective on how aviation activities affect communities and the broader economy, while gathering stakeholder input on aviation and airspace constraints. Its findings are intended to identify future aviation needs and lay the groundwork for long-term regional planning.

The Puget Sound Regional Council launched a two-year Regional Aviation Baseline Study, funded by a $1.6 million FAA grant, to assess the aviation system across King, Pierce, Snohomish, and Kitsap counties. The study examined existing airport roles, economic contributions, airspace capacity, and community impacts to build a technical foundation for future regional aviation planning decisions. Conducted in phases from 2019 to 2020, the study included stakeholder engagement, public meetings, and a final report outlining strategies for accommodating future aviation demand in the central Puget Sound region.

A November 2018 presentation by the Puget Sound Regional Council examined regional aviation needs against a backdrop of rapid growth in the central Puget Sound area, where the population rose from 3.7 million to 4.1 million people between 2010 and 2018. Over the same period, the region's job count grew from 1.9 million to 2.3 million, reflecting a strong and expanding economy. The study established a baseline for understanding how this growth affects aviation demand and, by extension, noise and capacity pressures at airports such as Sea-Tac.

A November 2018 presentation by the Puget Sound Regional Council examined the growing demand for aviation in the central Puget Sound region, driven by rapid population growth from 3.7 million to 4.1 million people and job growth from 1.9 million to 2.3 million jobs between 2010 and 2018. The Regional Aviation Baseline Study was presented to the Highline Forum to establish a foundation for understanding how the region's booming economy and population are shaping future airport capacity needs. The study provides context for ongoing policy discussions around Sea-Tac Airport and regional aviation planning.

The Highline Forum held a meeting on November 28, 2018, at the Highline School District's Educational Resource Activity Center in Burien, WA, focusing on education impacts and regional aviation capacity. Key agenda items included a StART Working Group update from the Port of Seattle, a Highline School District update, and a presentation on the PSRC Regional Aviation Baseline Study by Puget Sound Regional Council Executive Director Josh Brown. The document also outlines six bimonthly Highline Forum meeting dates scheduled throughout 2019, all running from 2:30pm to 4:30pm.

This document lists the weighted voting allocations for the General Assembly meeting held on May 31, 2018, covering member jurisdictions including counties, cities, tribal governments, and statutory members in the Puget Sound region. King County holds the largest county share at 264.52 votes, while Seattle leads all cities at 99.12 votes, and ports, WSDOT, and the Washington State Transportation Commission collectively contribute 153 statutory votes. The grand total of all weighted votes across all member categories equals 1,153.00.

The Regional Transportation Plan — 2018 is a draft planning document produced by the Puget Sound Regional Council (PSRC) in May 2018, outlining the regional transportation vision and investment priorities for the greater Puget Sound area, including King, Pierce, Snohomish, and Kitsap counties. Funded in part by federal transportation agencies and Washington State, the plan addresses multimodal transportation networks including roads, transit, and non-motorized travel. Note: this document does not specifically address Sea-Tac Airport noise policy and may have limited relevance to airport noise concerns.