Originally Posted by
AirportPlanner1
The point is it’s not radius but catchment, market and travel time. Most UK airports don’t truly have a 360 catchment. Many large European airports don’t have a 360 catchment either...half of Amsterdam’s for example is in the sea. Milan and Zurich theoretically have 360, but it’s severed by mountains.
Half, if not more than half, of Schiphol's catchment are flown in/out of SPL on the KLM network hub operation, much the same for Swiss's network in/out ZRH and Austrian's in/out VIE, just check some of the connection times between flights at ZRH & VIE, totally professional hub operations.