Assertion: aircraft's flight | /r/HasProperty | achievable
Facets:
value: in breaking the barrier
type: TEMPORAL
Source sentences:
text: In 1947 it was demonstrated that safe flight at the speed of sound was achievable in purpose-designed aircraft thereby breaking the barrier.
text: Because of the increase in drag approaching Mach 1, aerodynamicists and aviators disagreed on whether supersonic flight was achievable.