Many capacity-limited airports in Europe are so-called coordinated airports, meaning an airline must have a slot allocated to land at this airport. In Germany for example, these are FRA, DUS, HAM, MUC, STR, TXL and SXF. Often times, these airports are also used by general aviation aircraft, i.e. business jets, ambulance flights, government flights, etc.
Do airports "reserve" a given number of slots for such flights? Or are those flights exempted from the slot system?
I'm mostly interested in European regulations.