May 28, 2026August 12, 2026

Technical Appendix: SEA Airport Capacity Analysis — Supporting Documentation for Capacity White Papers

Notes

Technical appendix prepared by Jeffery Bogen (DAAC) dated May 28, 2026, supporting SAMP Seating Capacity SEPA/EIS Comment for Seattle-Tacoma International Airport (SEA / KSEA). Document covers FAA 2016 baseline hourly flow rates, observed hourly throughput 2024–2026, current capacity improvements at SEA, annual operations translation methodology, scenario definitions, and constrained vs. unconstrained operations projections through 2037 (Table 8-1). Includes sections on methodology notes, assumptions, data sources, and definitions/abbreviations. Filed in support of Port Of Seattle Sustainable Airport Master Plan (SAMP) SEPA/EIS process.

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Meeting Objectives Introduce the primary feedback themes identified by StART members regarding StART’s Operating Procedures and determine areas that may warrant future discussion. 5:00 PM – Welcome Meeting Management Welcome Lead: Andrés Mantilla, Facilitator, Uncommon Bridges; Wendy Reiter, Airport Managing Director, POS 5:15 PM – Dinner: All participants eat. 5:30 PM – StART Operating Procedures
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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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