After the original presidential aircraft, a C-87A Liberator Express nicknamed "Guess Where II," was deemed unsafe for presidential use due to safety concerns, a Douglas VC-54C Skymaster, known as the "Sacred Cow," was introduced for President Franklin D. Roosevelt in 1945. This aircraft was custom-built to meet the unique needs of presidential travel. It featured a radio telephone for secure communication, a sleeping area for rest during long flights, and an electric elevator to accommodate President Roosevelt's wheelchair, facilitating easier…