The Douglas D-906 was a paper project for a heavy lift transport by the Douglas Aircraft Company.
Douglas spent four years studying a heavy lift logistics aircraft capable of moving outsize payloads and Army units, for which no capability existed, under the CX-4 and Experimental Cargo-Heavy Logistics Support (CX-HLS) programs, which ultimately produced the C-5. The D-906 was one of them.
With a shoulder wing and six 30,000lb (13,608kg)-thrust turbofans, it superficially resembled the Antonov An-225. Planned payload was to be 195,000lb (88,451kg) for up to 3,260nmi (3,750mi; 6,040km), with a takeoff weight of 606,000lb (274,877kg).
Length was to be 190ft 8.5in (58.13m), span 192ft 2.5in (58.59m), and wing area 4,920sqft (457m2).
Sources
Francillon, René J. McDonnell Douglas aircraft since 1920. New York: Putnam, 1979. Page 718.
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