[Two biplanes in flight]

Photograph of two unidentified biplanes in flight at an air show, circa 1920s. One of the planes has a large smoke trail.

Inscription: "11136 A.S."

Stamped on verso: "Official photograph. Property of U.S. Army Air Service. Reproduction of this photograph is prohibited except when and as authorized in writing by the Chief of Air Service, Washington, D.C."