Seattle Museum of flight.
www.museumofflight.org/
9404 East Marginal Way South Seattle, WA 98108
(206) 764-5720
This is about a 40 minute car ride from me.
The description they have on their site for the WWI exhibit is:
Explore the history of “the war to end all wars” amid 18 World War One aircraft and interactive exhibits. Learn how the fighter plane and fighter tactics evolved as you discover the personal stories of flyers from around the world.