Originally intended as a military transport near the end of World War II, it was reworked after the war to compete with the Lockheed Constellation in the long-range commercial transport market. More than 700 were built and many still fly today in cargo, military, and wildfire control roles. \u00a0 \nThe Army Air Forces wanted a lengthened, pressurized version of the DC-4-based C-54 Skymaster transport with more powerful engines. Douglas Aircraft modified the design into a civil transport 80 in (200 cm) longer than the DC-4. The civil DC-6 first flew on 29 June 1946, being retained by Douglas for testing. The first airline deliveries were to American Airlines and United Airlines on 24 November 1946. \u00a0 \nThe following DC-6/DC-6B\u0027s were operated in Australia :- \u00a0 \n \u00a0 \nFor more details on the development, operational history and variants, click here. \u00a0 \nFor details of the fleet rationalisation between Ansett ANA and TAA, click here. \u00a0 \nThe specifications below are for the DC-6B.