Assertion: aircraft's engine | /r/CapableOf | become available
Facets:
value: for powered flight
type: PURPOSE
Source sentences:
text: When engines became available for powered flight around a hundred years ago, their mounts were made of metal.
text: Since the 1960s composite material airframes and quieter, more efficient engines have become available, and Concorde provided supersonic passenger service for more than two decades, but the most important lasting innovations have taken place in instrumentation and control.