First flying in May 1945, the XB-44 proved 50 mph faster than the B-29. Production was planned as the B-29D, but became the B-50 in December 1945. Officially, the aircraft's new designation was justified by the changes separating the B-29D from its predecessors- a common practice under this designation system and era. Unlike later designation system aircraft families were given many more letter number combinations; the DC-2 family was given 8 different letter-number combinations.
- Knaack, Marcelle Size. Post-World War II Bombers. Washington, D.C.: Office of Air Force History, 1988. ISBN 0-912799-59-5. p. 163.
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