I had the opportunity to visit Pearson Field in Vancouver, WA recently and discovered a really neat little gem. There are really three components to this. Pearson Field & Air Museum is part of the National Park Service (details at https://www.nps.gov/fova/learn/historyculture/pearson.htm) within Fort Vancouver. Pearson Field, as an actual airport, is run by the City of Vancouver. I explored the Museum.
Although not as large as similar museums, Pearson features some very cool exhibits. One of the most stunning is a De Havilland DH4 biplane. These are exceedingly rare. Along side was a Liberty V-14 aircraft engine. On the day I visited a Stinson Travel Air was being put on winter display. This biplane normally is used for site-seeing flights in Oregon!
Pearson Field is the site of several historical events, including the conclusion of the first Moscow-to-US flight. During WWI the field was the location of a crucial spruce mill. Sitka spruce lumber was cut and prepared for the airplane industry and the war effort.
If you are in the Vancouver area, stop by Pearson Field and Museum, and be sure to allow time to explore Ft. Vancouver.