The U.S. Postal Service used modified DH-4s in the early 1920s to transport air mail coast-to-coast. Represented here by a restored Airco DH-4M-2D photographed by Charles Stewart in 2012
The U.S. Postal Service used modified DH-4s in the early 1920s to transport air mail coast-to-coast. Represented here by a restored Airco DH-4M-2D photographed by Charles Stewart in 2012