| http://www.w3.org/ns/prov#value | - (i) Air navigation facility * * * means any facility other than one owned and operated by the United States, used in, available for use in, or designed for use in aid of air navigation, including any structures, mechanisms, lights, beacons, markers, communicating systems, or other instrumentalities, or devices used or useful as an aid, or constituting an advantage or convenience, to the safe tak
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