Opposition Growing to Plans For New Sea-Tac Reliever Airport

Three possible site locations are under consideration as state officials predict the airport will max out its capacity by 2050.

Meg Godlewski

Friday, February 03, 2023 at 06:07 PM ET

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Pierce County, Washington already has busy airspace, as seen taking off from Pierce County-Thun Field (KPLU). Pilots must be mindful of a U.S. Air Force base to the west and the Class Delta that belongs to Tacoma Narrows Airport (KTIW). [Credit: Meg Godlewski]

Key Takeaways:

A proposal for a new 3,000-acre airport south of Seattle, intended to address Sea-Tac's projected capacity limits by 2050, is encountering widespread opposition.
Three initial "greenfield" sites in Pierce and Thurston counties have been met with universal resistance from residents, local governments, and the military due to environmental concerns, displacement, and operational incompatibility.
Yakima Valley on the east side of the state is now emerging as a potential alternative, with local government interest and significant economic projections, despite needing substantial improvements to cross-state transportation infrastructure.

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A proposal to build a 3,000-acre airport to accommodate airline and cargo traffic south of Seattle continues to run into across-the-board opposition.

In October, the Commercial Aviation Coordinating Commission (CACC) announced they were studying three locations—known as greenfields—for the construction of a new airport to handle passengers and cargo. The project, however, sparked opposition, which has been getting larger and louder ever since.