Any city having a population of over two hundred fifty thousand (250,000) or the board of park commissioners or airport authority thereof and any city having a population of more than one hundred twenty thousand (120,000) and less than one hundred fifty thousand (150,000), when authorized to operate an airport, is hereby authorized and empowered to issue revenue bonds for the acquisition, construction, alteration, repair, improvement, extension or enlargement of such airport.
K.S.A. 3-145