The De Havilland DH-4 served longer than any other World War I-era aircraft and was the most popular plane in 1920's America. A workhorse aircraft during the war, this extremely versatile plane was modified to perform numerous functions in peacetime.
The Douglas O-2 observation plane was the first of many O-series aircraft that succeeded the De Havilland DH-4 in the U. S. military. The redesigned fuselage and tail, streamlined carraige, and staggered wings of unequal length gave the O-2H model shown here an innovative advantage. The O-2 and the even more streamlined O-25 were flown at Crissy Field in the late 1920's and early 1930's.