The XK-427 Firefly was a experimental test-bed aircraft utilising the KH503 Firefly fuselage with modified wing structure and was used for the testing and evaluation of new antigravity technology. Unfortunately this craft forced-landed behind Mercenary lines and was captured. Subsequently Mercenary army scientists were able to copy and develop the antigravity technology and incorporate it into the new fighter being developed at the time code named Falke.
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