No ideas at present; but isnt it a quaint airport. Manicured gardens, and Art-deco design, it posseses all of the halycon days of aviation long gone in Regional Hubs. The admin buidling includes a Met Ofice (pathway leading off to the 2 oclock on the first photo) and with a terminal built into the base of the tower, my nearest guess would be a United States, Regional Hub, probably now redundant or overlaid in masses of concrete. Reminds me of Braunschwieg in Germany, although I know for sure that it is not.