As a retired Air Pressure Reserve officer, I strongly assist using McChord Area at Joint Base Lewis-McChord as the following airport.
Have a look at all the benefits, together with proximity to the metropolitan heart and Interstate 5, and a big airport space. The disadvantages, reminiscent of getting U.S. authorities approval and crowded flight paths, can virtually definitely be solved.
McChord is an underutilized gem that needs to be shared with civilians. There are some 21 U.S. airports which can be joint use. Positive, there are issues, however fixing them is effectively definitely worth the effort.
Jay Holman, Issaquah