Assertion: airspace | /r/SimilarTo | sea level
Facets:
Source sentences:
text: Class A airspace is generally the airspace from 18,000 feet (3.41 miles) mean sea level (MSL) up to and including flight level (FL) 600, including the airspace overlying the waters within 12 nautical miles (NM) of the coast of the 48 contiguous states and Alaska.