Assertion: aircraft | /r/HasProperty | airborne
Facets:
value: before the end of 1941
type: TEMPORAL
Source sentences:
text: By the end of the catapult stroke, the aircraft is airborne and further propulsion is provided by its own engines.
text: from May 1941 they took responsibility for final erection followed by the test flight and their first aircraft was airborne before the end of 1941.