The SeaTac Airport Central Terminal was renovated and expanded in 2005. It has numerous shops and restaurants, a floor-to-ceiling window with a view of the runway and the Olympic Mountains*, and plenty of space to sit or walk around.
But I’m not in the Central Terminal. I’m in the South Satellite Terminal. The Runway Grill looks like it might be my best lunch option.
* Not that you can see them most of the time.