; (B) a unit of local government; (C) a Tribal government; (D) a metropolitan planning organization; or (E) a combination of the entities described in subparagraphs (A) through (D). (8) Small unmanned aircraft; unmanned aircraft; unmanned aircraft system The terms small unmanned aircraft , unmanned aircraft , and unmanned aircraft system have the meanings given such terms in section 44801 of title 49, United States Code.