Assertion: air travel | /r/CapableOf | become ubiquitous
Facets:
value: by the 1990s
type: TEMPORAL
value: in the 21st century
type: TEMPORAL
Source sentences:
text: Indeed, air travel has become so ubiquitous in the 21st century that one woman, Alexis Alford, visited all 196 countries before the age of 21.
text: By the 1990s, air travel had become ubiquitous.