Assertion: airspace | /r/CapableOf | extend above mean sea level
Facets:
value: from 18,000 feet
type: OTHER
value: from the surface
type: LOCATION
Source sentences:
text: In addition to airport traffic, Burke Lakefront tower and approach control typically provide radar separation to medivac helicopters en route to University Hospitals of Cleveland and Cleveland Clinic which fall within the airspace that extends from the surface to 3000 feet above mean sea level.
text: Class A airspace extends from 18,000 feet to 60,000 feet above mean sea level (MSL) and is pri­marily used by airliners traveling between major cities.