Developing the Boeing B-29 Superfortress bomber was the most expensive project of World War II, costing about a billion dollars more than the Manhattan Project. The plane that dropped the first atomic bomb cost more than the bomb itself.

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11 of the World’s Most Famous Warplanes

World history is often defined by wars. During the 20th and 21st centuries, aircraft came to play increasingly important roles in determining the outcome of battles as well as being deterrents to aggression. Military aircraft came of age during World War II, and their utility for both military and