The Sacred Cow was a C-54 (Douglas 1942)

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Starting in 1942 came more than 1,000 C-54s, the four-engine transport which made global military airlift possible. The C-54 was a military counterpart of the DC-4. It flew a million miles a month over the rugged North Atlantic - more than 20 round trips a day. A C-54, irreverently called the "Sacred Cow" by the White House press corps, became the first presidential aircraft, ordered for Franklin D. Roosevelt.