The Me 262: Sleek,fast and heavily armed, was a quantum leap in fighter technology. By June 1944 only a handful were in service. But there was another jet fighter. One designed and built before the Me 262. The Heinkel He 280 was capable of over 500 miles per hour was nowhere to be seen. First flown in 1940 it was two years ahead of Messerschmitt's Me 262. Who killed the world's fist jet fighter?