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Douglas C-54 Skymaster

Douglas · Strategic Transport · USA · WWII (1939–1945)

Douglas C-54 Skymaster — Strategic Transport
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The Douglas C-54 Skymaster was the U.S. Army Air Forces' principal four-engine long-range transport during WWII — the militarised version of Douglas's DC-4 commercial airliner. Douglas built 1,170 C-54s between 1942 and 1947 at five plants. The aircraft flew transoceanic supply missions across the Atlantic and Pacific (some C-54s flew the Pacific route up to 90 hours of straight flying), supported the Manhattan Project's logistics, and provided VIP transport for Franklin D. Roosevelt, Winston Churchill, and Joseph Stalin during WWII. Post-war the C-54 was the principal aircraft of the 1948-1949 Berlin Airlift — about 380 C-54s flew Operation Vittles, hauling 1.5 million tonnes of supplies into West Berlin against the Soviet ground blockade.

The C-54 used four Pratt & Whitney R-2000 Twin Wasp 14-cylinder radials (1,290 hp each). Maximum speed 274 mph; range 4,000 miles (the longest of any U.S. military transport of WWII); service ceiling 22,300 ft. Payload: 32,500 lb of cargo or 50 troops. The aircraft was based on the DC-4 airliner design Douglas had been working on since 1938; the prototype DC-4 first flew 7 February 1942 and the U.S. Army Air Forces took it over directly without any commercial production.

WWII service. C-54s flew the Atlantic Ferry Route from Newfoundland to England, the South Atlantic route from Natal (Brazil) to Dakar (Senegal), and the trans-Pacific route from California to Australia and the Philippines. The aircraft's 4,000-mile range made it the only U.S. military transport able to cross the Pacific without intermediate refuelling stops. Roosevelt's personal C-54 was named the Sacred Cow; Churchill flew on a British C-54; Joseph Stalin used a Lend-Lease C-54 for limited travel. About 22 C-54s flew the Manhattan Project logistics in 1944-1945, including the components of the atomic bombs delivered to Tinian Island for assembly.

The Berlin Airlift was the C-54's most-publicised role. After the Soviet Union blockaded Berlin's ground access in June 1948, the U.S. Air Force (and RAF) launched Operation Vittles to airlift food, fuel, and supplies into the city via the air corridors permitted by Allied agreements. About 380 C-54s flew about 277,000 sorties over 11 months (June 1948 - May 1949), delivering 2.3 million tonnes of supplies and forcing the Soviet Union to lift the blockade. The C-54 continued in U.S. Air Force service through the Korean War; final USAF retirement was 1972 (VC-54Cs and VC-118A presidential variants). About 25 C-54 airframes survive in 2026, including the airworthy Sacred Cow at the National Museum of the U.S. Air Force.

For Kids — a shorter, friendlier version

The Douglas C-54 Skymaster was a big military transport plane used during World War II. It had four powerful engines and could fly very long distances. The American army used it to carry supplies, troops, and important passengers across oceans.

The C-54 could fly up to 4,000 miles without stopping. That is longer than the distance from New York to London! Some flights across the Pacific lasted up to 90 hours of straight flying. It could carry up to 50 soldiers or over 32,000 pounds of cargo.

Famous leaders flew on the C-54 during the war. President Franklin Roosevelt had his own special C-54 called the Sacred Cow. Leaders like Winston Churchill and Joseph Stalin also traveled on these planes.

After the war, the C-54 became a hero of the Berlin Airlift. From 1948 to 1949, West Berlin was cut off by a Soviet ground blockade. About 380 C-54s flew food and supplies into the city. Together they hauled around 1.5 million tonnes of supplies to keep people fed and warm.

Douglas built 1,170 of these planes between 1942 and 1947. The C-54 was based on a passenger airliner design called the DC-4. It was one of the most important transport planes ever made.

Fun Facts

  • The C-54 Skymaster had four engines, each making 1,290 horsepower — that is a lot of pulling power!
  • Some C-54 flights over the Pacific lasted up to 90 hours of nonstop flying.
  • The C-54 could fly up to 4,000 miles, longer than the distance across the whole Atlantic Ocean.
  • President Roosevelt's personal C-54 was nicknamed the Sacred Cow.
  • About 380 C-54s took part in the Berlin Airlift, flying supplies to a blockaded city.
  • The C-54 could carry 50 soldiers at once — as many as a full school bus.
  • Douglas built 1,170 C-54s at five different factories between 1942 and 1947.
  • The C-54 could reach a top speed of 274 miles per hour, faster than most cars on a highway.

Kids’ Questions

What did the C-54 Skymaster do in the Berlin Airlift?

West Berlin was cut off by a Soviet ground blockade in 1948. About 380 C-54s flew food, coal, and supplies into the city to help the people there. They hauled around 1.5 million tonnes of supplies in total. It was one of the biggest airlift missions in history.

Why was President Roosevelt's C-54 called the Sacred Cow?

President Franklin Roosevelt had his own special C-54 for travel during World War II. It was given the nickname the Sacred Cow because it was kept very safe and important. He used it to meet with other world leaders during the war.

How far could the C-54 fly?

The C-54 could fly up to 4,000 miles on a single trip. That made it the longest-range American military transport of World War II. Some Pacific flights lasted as long as 90 hours of straight flying!

Variants

C-54 / C-54A / C-54B / C-54D / C-54E (USAAF)
Standard production sub-variants 1942-1947. C-54D (380 built) was the most-numerous WWII variant; C-54G (1946) was the post-war refresh.
VC-54C 'Sacred Cow' (Roosevelt)
Presidential transport variant for Franklin D. Roosevelt 1944-1945. Used for the Yalta Conference (February 1945) and other major WWII summit travel. Preserved at the National Museum of the U.S. Air Force.
DC-4 (commercial)
Civil airliner version. About 79 built post-war from C-54 production; many WWII-surplus C-54s were also converted back to DC-4 configuration for civil airline use through the 1950s.

Notable Operators

U.S. Army Air Forces / U.S. Air Force
Largest user. WWII trans-Atlantic / trans-Pacific service + Berlin Airlift + Korean War. Final USAF retirement 1972 (presidential VC-54C / VC-118A variants).
Royal Air Force / Royal Canadian Air Force
About 70 Skymaster I variants under Lend-Lease. Continued post-war service into the 1960s.
U.S. Navy / U.S. Marine Corps (R5D)
About 200 R5D-1 / R5D-3 airframes. Used in trans-Pacific airlift and post-war maritime patrol roles. Final retirement 1962.

Frequently Asked Questions

What was the Berlin Airlift?

The 1948-1949 Allied air operation that supplied West Berlin during the Soviet ground blockade (June 1948 - May 1949). About 380 U.S. C-54s plus RAF Avro York and Handley Page Hastings transports flew about 277,000 sorties, delivering 2.3 million tonnes of food, fuel, and supplies. The airlift forced the Soviet Union to lift the blockade and became the iconic Cold War humanitarian operation.

What was the Sacred Cow?

President Franklin D. Roosevelt's personal C-54 (a VC-54C variant) used 1944-1945 for major WWII travel including the February 1945 Yalta Conference. The aircraft was equipped with a wheelchair-accessible elevator, secure communications, and a full presidential bedroom suite. It is preserved at the National Museum of the U.S. Air Force at Wright-Patterson AFB, Ohio.

How many C-54s flew the Berlin Airlift?

About 380 C-54s of the U.S. Air Force, plus a smaller number of Royal Air Force aircraft. The C-54 was the airlift's primary workhorse because of its 32,500 lb cargo capacity and reliability. At peak operations, a C-54 landed at Berlin Tempelhof Airport every 90 seconds.

How many C-54s were built?

1,170 airframes between 1942 and 1947 — at five Douglas plants (Santa Monica, Long Beach, Chicago, Oklahoma City, and Detroit). Production continued briefly post-war as the airliner DC-4 variant; about 79 commercial DC-4s were built before the line transitioned to the larger DC-6.

Are any C-54s still flying?

Yes — about 6 airworthy C-54s in 2026, including the Sacred Cow at the National Museum of the U.S. Air Force (preserved but not flown), the Berlin Airlift Historical Foundation's Spirit of Freedom, and several other warbird airframes. About 25 total airframes survive in static-display condition.

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