| http://www.w3.org/ns/prov#value | - aircraft, aircraft power plants and accessories; the repair, packing and maintenance of parachutes; the design, establishment, construction, extension, operation, improvement, repair or maintenance of airports, restricted landing areas or other air navigation facilities; and instruction in flying or ground subjects pertaining thereto. (b) ???Aircraft???, any contrivance now known, or hereafter inv
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