'Sacred Cow' First Official Presidential Plane

The Douglas VC-54C "Sacred Cow," seen here at the National Museum of the U.S. Air Force in Dayton, Ohio, became the first official presidential airplane in 1944. President Franklin D. Roosevelt was the first president to use the "Sacred Cow" in 1945 just before he died. The plane features an elevator that would lift FDR in his wheelchair aboard the plane.

abcnews.go.com/Politics/photos/air-force-us-presidents-planes-1943-30015388/image-sacred-cow-official-presidential-plane-30037718