TagSAMP(642)

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.

A Des Moines resident's formal comment on the Sea-Tac Airport Master Plan (SAMP) Environmental Impact Statement argues that the SAMP's aircraft seat capacity assumptions are now outdated, pointing to major 2026 fleet expansions by Alaska Airlines and Delta that include significantly more and larger widebody aircraft operating from SEA. The comment contends that because larger planes carry more passengers per flight, fewer total aircraft operations would be needed to reach the SAMP's 56 million passenger target, meaning the airport could handle projected growth with less noise impact than the SAMP currently estimates. The author presents revised seat-capacity scenarios suggesting the SAMP's low-growth assumption is internally inconsistent and that updated fleet data should be incorporated into the EIS before final conclusions are drawn.

A Des Moines resident submitted a formal comment arguing that the Seattle-Area Metroplex Environmental Impact Statement (SAMP EIS) significantly underestimates the health risks of aviation noise by omitting key peer-reviewed studies linking aircraft noise to cardiovascular disease, heart structural changes, and sleep disruption. The commenter contends that the EIS relies on outdated and methodologically flawed research, particularly FICAN studies using extrapolated rather than measured data, while ignoring more recent findings from the WHO, the HYENA Project, and a 2025 cardiac MRI study. The comment calls on the FAA to conduct a proper cumulative health effects analysis and require additional noise mitigation measures beyond the current DNL 65 dB contour threshold.

Agenda for the Highline Forum meeting hosted by the City of Burien with a focus on Sustainable Airport Master Plan Update. The meeting includes public comments, host updates, environmental updates, educational partnerships, and round table discussions.