I toured the first presidential aircraft, 'The Flying White House,' used by FDR and Harry Truman. Take a look inside.

"The Douglas VC-54C Skymaster, nicknamed the Sacred Cow, entered service in 1944 as the first aircraft built for the president of the United States. Officially named "The Flying White House," it featured an executive conference room with a bulletproof window and an elevator shaft for President Franklin D. Roosevelt to board the plane in his wheelchair. It's also regarded as the birthplace of the US Air Force."

"The first presidential plane was built at the order of General Henry "Hap" Arnold, one of the world's first military aviators who learned to fly from the Wright brothers, according to the US Air Force. Only one VC-54C plane was ever built using a fuselage from a C-54A and wings from a C-54B. President Franklin D. Roosevelt flew on the plane just one time - a visit to Crimea for the Yalta Conference in 1945 - before his death later that year."

"The "Flying White House" became better known by its nickname, the "Sacred Cow." It operated from 1944 to 1961 with an executive conference room and elevator for FDR's wheelchair. President Harry Truman signed the National Security Act of 1947 while on board, establishing the Air Force as an independent service. In August, I toured the Douglas VC-54C Skymaster at the National Museum of the US Air Force in Dayton, Ohio."

The Douglas VC-54C Skymaster, nicknamed the Sacred Cow and officially called The Flying White House, entered service in 1944 as the first aircraft built specifically for the US president. The single VC-54C combined a C-54A fuselage with C-54B wings and included an executive conference room with a bulletproof window and an elevator for Franklin D. Roosevelt's wheelchair. Franklin D. Roosevelt flew on the aircraft once to the 1945 Yalta Conference; Harry Truman used it more and signed the 1947 National Security Act aboard, creating the independent US Air Force. The aircraft was retired in 1961 and restored for public display at the National Museum of the US Air Force in Dayton, Ohio.

Read at Business Insider