https://en.wikipedia.org/wiki/Curtiss_O-52_Owl

Developed in 1939, the Curtiss O-52 was the last “heavy” observation aircraft developed for the US Army Air Corps. The concept of the two-seat observation aircraft, classed as the “O” series aircraft, dated to World War I, and in 1940, the Army Air Corps ordered 203 Curtiss O-52s for observation duties. By 1941, the O-52 was no match for modern combat conditions.