Germany is arguably one of the top European countries which provide good facilities to watch aeroplanes, be it from the terminal or designated areas away from the terminal. Some require security control and others don't depending on the location. Some charge a fee whilst others don't. Where they have to, the public is willing and happy to pay an entry fee, which pays for maintenance and staffing. In the UK, Manchester Airport continues to provide good family facilities. Unfortunately airports like Heathrow and Gatwick are not interested in providing anything which won't bring in zillions of $$$!