The Douglas D-906 was a paper project for a heavy lift transport aircraft by the Douglas Aircraft Company.
Douglas spent four years from the 1960s by 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) program bids from Boeing, Douglas and Lockheed, the winner was ultimately produced the C-5. The D-906 was one of them but later became a bid for the CX-HLS program.
With a shoulder wing and six -thrust turbofans, it superficially resembled the Antonov An-225. Planned payload was to be for up to , with a takeoff weight of .
The length was to be , span , and wing area .
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