The City of Des Moines, WA provided its City Council with an update on the Sustainable Airport Master Plan (SAMP) for Seattle-Tacoma International Airport, following the FAA's September 2025 approval of 31 near-term expansion projects — including 19 new gates, a second terminal, and cargo facilities. The Port of Seattle launched a state-level environmental review (SEPA) in May 2026, releasing a Draft Environmental Impact Statement with a 60-day public comment period. Des Moines is collaborating with the cities of Burien and SeaTac through an Interlocal Agreement to submit coordinated comments, with the final report expected in 2027.Open full document
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Des Moines City Council agenda item providing an update on the Sustainable Airport Master Plan (SAMP) environmental review process. The FAA completed their NEPA review in September 2025, approving 31 near-term projects including 19 additional gates and a second terminal. The Port of Seattle is now conducting SEPA review with a Draft EIS released May 22, 2026.
