North American B-25 Published on August 15, 2013 in 19 August 1940Full resolution (1800 × 1193) ← Previous Next → Front view of the first North American B-25 Mitchell, 40-2165. The constant dihedral wing was used on the first nine airplanes built. (U.S. Air Force)Front view of the North American B-25. Note the constant dihedral wing. (U.S. Air Force photo)