|National origin||United States|
|Manufacturer||Douglas Aircraft Company|
|First flight||14 February 1942 (production series)|
|Introduction||1942 with United Airlines|
|Status||In very limited use|
|Primary users||South African Airways Museum Society|
United Airlines (historical)
American Airlines (historical)
Trans World Airlines (historical)
|Produced||1942 – August 1947|
|Number built||80 DC-4 and 1,163 C-54/R5D|
|Variants||C-54 Skymaster |
Canadair North Star
Aviation Traders ATL-98 Carvair
|Developed into||Douglas DC-6|
The Douglas DC-4 is an American four-engined (piston), propeller-driven airliner developed by the Douglas Aircraft Company. Military versions of the plane, the C-54 and R5D, served during World War II, in the Berlin Airlift and into the 1960s. From 1945, many civil airlines operated the DC-4 worldwide.
Following proving flights by United Airlines of the DC-4E, it became obvious that the 52-seat airliner was too large to operate economically and the partner airlines[a] recommended a long list of changes required to the design. Douglas took the new requirement and produced a new design, the DC-4A, with a simpler unpressurised fuselage, R-2000 Twin Wasp engines, and a single fin and rudder. Both designs included tricycle landing gear, unlike the predecessor two-engined DC-3.
With the entry of the United States into World War II, in December 1941, the War Department took over the provision orders for the airlines and allocated them to the United States Army Air Forces with the designation C-54 Skymaster. The first C-54 flew from Clover Field in Santa Monica, California, on 14 February 1942.
To meet military requirements, the first production aircraft had four additional auxiliary fuel tanks in the main cabin, which reduced the passenger seats to 26. The following batch of aircraft was designated C-54A and built with a stronger floor and a cargo door with a hoist and winch. The first C-54A was delivered in February 1943. With the introduction of the C-54B in March 1944, the outer wings were changed to hold integral fuel tanks, allowing two of the cabin tanks to be removed; this allowed 49 seats (or 16 stretchers) to be fitted. The C-54C was a hybrid for Presidential use, it had a C-54A fuselage with four cabin fuel tanks and the C-54B wings with built-in tanks to achieve maximum range.
The most common variant was the C-54D, which entered service in August 1944, a C-54B with more powerful R-2000-11 engines. With the C-54E the last two cabin fuel tanks were moved to the wings, which allowed more freight or 44 passenger seats.
In total, 1,163 C-54/R5Ds were built for the United States military between 1942 and January 1946; another 79 DC-4s were built after the war. A later variant, equipped to fly over 40% faster, was built in Canada as the Canadair North Star.
The DC-4/C-54 proved to be a popular and reliable type, with 1,245 being built between May 1942 and August 1947, including 79 postwar DC-4s. Several remained in service as of 2014. One current operator is Buffalo Airways of Yellowknife, Northwest Territories.
Douglas continued to develop the type during the war in preparation for a return to airline use when peace returned. The type's sales prospects were affected when 500 wartime ex-military C-54s and R5Ds came onto the civilian market, many being converted to DC-4 standard by Douglas. DC-4s were a favorite of charter airlines such as Great Lakes Airlines, North American Airlines, Universal Airlines, and Transocean Airlines. In the 1950s, Transocean (Oakland, California) was the largest civilian C-54/DC-4 operator.
Douglas produced 79 new-build DC-4s between January 1946 and August 9, 1947, the last example being delivered to South African Airways. Pressurization was an option, but all civilian DC-4s (and C-54s) were built unpressurized.
A total of 330 DC-4s and C-54s was used in the Berlin Airlift, which made them the most used types.
Purchasers of new-build DC-4s included Pan American Airways, National Airlines, Northwest Airlines, and Western Airlines in the US, and KLM Royal Dutch Air Lines, Scandinavian Airlines System, Iberia Airlines of Spain, Swissair, Air France, Sabena Belgian World Airlines, Cubana de Aviación, Avianca, Aerolíneas Argentinas, Aeropostal of Venezuela (1946), and South African Airways overseas. Several airlines used new-build DC-4s to start scheduled transatlantic flights between Latin America and Europe. Among the earliest were Aerolíneas Argentinas (1946), Aeropostal of Venezuela (1946), Iberia Airlines of Spain (1946), and Cubana de Aviación (1948).
Basic prices for a new DC-4 in 1946–47 was around £140,000-£160,000. In 1960, used DC-4s were available for around £80,000.
As of June 2020[update], two DC-4s were operational South Africa. Owned by the South African Airways Museum Society, they are used by SkyClass Aviation for charters. Both aircraft (ZS-BMH and ZS-AUB) are in historical South African Airways livery.
Very few DC-4s remain in service today.
Aircraft of comparable role, configuration, and era
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