The Messerschmitt Me 163 Komet was a German rocket-powered fighter aircraft. It is the only rocket-powered fighter aircraft ever to have been operational. Its design was revolutionary, and the Me 163 was capable of performance unrivaled at the time. German test pilot Heini Dittmar in early July 1944 reached 1,130 km/h (700 mph), a flight airspeed record. Over 300 aircraft were built, but the Komet proved ineffective as a fighter and was responsible for the destruction of only about nine Allied aircraft.(Source : Wikipedia)
The plane is included in the Me-262 package as a free addon.
A glider version of the plane is also included.
X-Plane 11 pictures:
X-Plane 10 pictures: