Assertion: jet aircraft | /r/HasProperty | the heinkel he
Facets:
value: in june
type: TEMPORAL
Source sentences:
text: The first jet aircraft to fly was the Heinkel He 178 (Germany), flown by Erich Warsitz in 1939, followed by the world's first operational jet aircraft, the Me 262, in July 1942 and world's first jet-powered bomber, the Arado Ar 234, in June 1943.