The Luftwaffe's Messerschmitt ME-262 Schwalbe jet. Once airborne, it simply could not be touched by allied fighters. It flew over 150 km/h faster. The only reliable way to destroy them, as with the Luftwaffe's even faster Me 163 rocket fighters, was to get to them on the ground before-and-during-take-off, or to deprive the Germans of the fuel supplies they needed. But this worked. These magnificent warbirds ended up not changing a thing in the course of the war.
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