Assertion: glider's pilot | /r/AtLocation | the air
Facets:
value: for more than 20 minutes
type: TEMPORAL
value: in a glider
type: LOCATION
Source sentences:
text: As a result, German aircraft designers turned their attention toward the practical development of unpowered aircraft, with a pilot remaining in the air in a glider for more than 20 minutes and a national glider competition emerging by 1922.