Assertion: e airspace | /r/HasProperty | designated at lower altitude
Facets:
Source sentences:
text: Unless designated at a lower altitude, Class E airspace begins at 14,500 MSL over the United States, including that airspace overlying the waters within 12 NM of the coast of the 48 contiguous states and Alaska, up to but not including 18,000 feet MSL, and the airspace above FL 600.
text: Unless designated at a lower altitude, Class E airspace begins at 14,500 feet above MSL over the United States up to but not including 18,000 feet above MSL.