They're not the first. Manchester and Vienna come to mind. It's a great idea and more airports should follow suit. Trouble is that most of them seem to get some perverted pleasure by making life as difficult as possible for spotters! The outcome is that by doing so they actually cause themselves more security headaches than if they provided decent facilities in the first place. To make it effective though, local spotters should be background checked and be issued with local spotter I/Ds. A little admin involved in the beginning, but worthwhile I would think.