The North Dakota aeronautics commission and all counties, cities, park districts, and townships of this state, separately or jointly, may acquire, establish, construct, expand, own, lease, control, equip, improve, maintain, operate, regulate, and police airports and landing fields for the use of aircraft either within or without the geographic limits of such political subdivisions, and may use for such purpose or purposes any available property owned or controlled by the state aeronautics commission or such political subdivisions. Any property acquired, owned, leased, controlled, or occupied for the purpose or purposes enumerated herein hereby is declared to be acquired, owned, leased, controlled, or occupied for a public purpose and as a matter of public need, and there is no liability on the part of the state aeronautics commission or any county, city, park district, or township in connection therewith, or in the operation thereof, except to its own employees.