Tennessee Code Title 42. Aeronautics § 42-2-103

(a) The acquisition of any lands or interests in lands pursuant to this chapter, the planning, acquisition, establishment, construction, improvement, maintenance, equipment, and operation of airports, air navigation facilities, and avigation easements and the acquisition, lighting, marking or eliminating of airport hazards, whether by the state separately or jointly with any municipality or municipalities, or airport authority, and the exercise of any other powers granted in this chapter to the department are declared to be public and governmental functions, exercised for a public purpose, and matters of public necessity, and no action or suit shall be brought or maintained against the state or any municipality, or airport authority or any officers, agents, servants, or employees of the foregoing, in or about the construction, maintenance, operation, superintendence, or management of any state or municipal airport or airport authority, navigation facility, avigation easement or airport hazard.

(b) All lands and other property and privileges acquired and used by or on behalf of the state in the manner and for the purposes enumerated in this chapter shall and are declared to be acquired and used for public and governmental purposes and as a matter of public necessity.