TagSea-Tac Airport(1835)

Appendix H of the Seattle-Tacoma International Airport (Sea-Tac Airport) Part 150 Study, containing official Noise Exposure Maps (NEMs) for 2022 Existing Conditions and 2032 Future Conditions, signed by Sarah Cox, Director of Aviation Environment & Sustainability, Port of Seattle, dated 06/20/26. Includes Aviation Environmental Design Tool (AEDT) flight tracks — North Flow and South Flow

The Port of Seattle Commission held a special public meeting on June 11, 2026, at 10:30 a.m. in Conference Room 4A at Seattle-Tacoma International Airport. The sole agenda item was a Commission Planning Retreat for 2026, with no formal actions taken and no virtual attendance option provided.

Presentation slides for the sixth meeting of the Part 150 Study Technical Review Committee (TRC) for Seattle-Tacoma International Airport, held June 8, 2026. The meeting covered potential Noise Compatibility Program (NCP) measures including noise abatement, land use, and program management. The agenda also included a review of the previous meeting summary, project schedule, and future

The Port of Seattle submitted this Noise Exposure Map (NEM) Report to the Federal Aviation Administration under 14 CFR Part 150, documenting aircraft noise levels around Seattle-Tacoma International Airport for 2022 (existing conditions) and 2032 (projected future conditions). The report was prepared by Environmental Science Associates and certified by the Port's Director of Aviation Environment and Sustainability on June 26, 2026, confirming that current airport operations remain consistent with the 2022 data. It includes documentation of public and agency consultation, noise contour maps showing areas exposed to DNL 65+ decibel levels, and supporting forecasts of aircraft activity through 2032.

This technical memorandum from Harris Miller Miller & Hanson Inc. (HMMH), dated June 5, 2026, presents the results of interior sound insulation testing conducted in April 2026 for 30 homes near Seattle-Tacoma International Airport as part of the SEA Repair and Replacement Program. Acoustical engineers measured how well each room in these homes reduces outside aircraft noise, finding that only 4 of the 30 structures met the FAA's minimum threshold of 45 decibels of interior noise to qualify for sound insulation treatments. An additional 16 homes had at least one room exceeding that threshold, suggesting potential benefit from window and door upgrades, though current FAA policy does not require treatment based on individual room results alone.

A Des Moines resident's formal comment on the Seattle-Area Metroplex Environmental Impact Statement argues that Sea-Tac Airport's official planning assumption — that average aircraft size will grow by only 0.5% per year — is mathematically incompatible with the airport's own goal of 56 million annual passengers by 2032. The comment shows that reaching that passenger target under the current assumption would require roughly 880,000 flights per year, far exceeding the airport's infrastructure ceiling of about 517,000 operations. The author contends that airlines like Alaska and Delta are already ordering larger aircraft and expanding international routes at Sea-Tac, meaning faster fleet upgauging is not a worst-case scenario but a necessity for the plan to make sense.