CASEMATE announces an air combat story of the US's top two-seater ace crews: A Pair of Aces and a Trey: 1st Lieutenants William P. Erwin, Arthur E. Easterbrook, and Byrne V. Baucom: America's Top Scoring World War I Observation Pilot and Observers.
This is partial text from the full article (usually with photos) at https://aeroscale.net/news/wwi-two-seater-story-a-pair-of-aces-and-a-trey