Each authority may lease its airport and all or any part of the appurtenances and facilities therewith to any available lessee, subject to all Constitutional and statutory limitations with respect thereto, at such rental and upon such terms and conditions as the authority deems proper. The leases shall be subordinate to any mortgage or deed of trust executed by the authority. An authority may lease land, the original taking of which was necessary for airport purposes, for economic development purposes compatible with, but not necessarily associated with, airport activities.