Airports earn money in many ways, of course, and landing fees and parking fees assume reduced importance if they can generate income from retailing, car parking and so on. But most important of all will be income from MROs and other based servicing and industrial/commercial organisations. SEN managed to keep going for years without scheduled services and made a small but viable profit from its MROs which included ATC Lasham, Air Livery and many others. My point is that well managed airports can survive without making money from landing fees.......