The 70-year-old B-52 bomber will basically be 'a new airplane' once it finally gets its upgrades, Trump's pick for nuclear command says

The upgrades are part of a plan to keep the B-52s in service until at least 2050, but they're delayed with cost overruns.
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How Super Bombers Shaped the Cold War

We trace how the atomic age transformed aerial warfare - from the B-29 that ended World War II to the gargantuan B-36, the ...
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X-20: A Spaceplane That Could Have Been ‘Dropped’ from a B-52 Bomber

Key Points and Summary - Decades before the Space Shuttle, the U.S. backed the X-20 Dyna-Soar: a reusable, skip-glide spaceplane born from WWII German concepts and accelerated by the Sputnik shock.