The designation B-29K had originally been assigned to the hose tanker conversions of the B-29 that were eventually produced as KB-29M. Since none of the tankers ever actually used the K suffix, it was reassigned to a single B-29-BW that was used as a cargo transport and designated CB-29K.
Sources:
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Warbird History--B-29 Superfortress, Chester Marshall, Motorbooks
International, 1993.
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The Boeing B-29 Superfortress, Mich Mayborn, Aircraft in Profile,
Doubleday, 1969.
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B-29 Superfortress, John Pimlott, Gallery Books, 1980.
- Boeing Aircraft Since 1916, Peter M. Bowers, Naval Institute Press, 1989.
