Douglas' giant XB-19 (also XBLR-2 — eXperimental Bomber, Long Range) Hemisphere Defender was a one-off testbed for technologies for giant long-range bombers. Like so many large-plane projects of its time, it was designed for engines that never materialized, so performance was never up to design levels.

In line with the American "Bigger is Better" mindset, the B-19 attracted a fair amount of attention and press.

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