There are examples of airports that operate as systems around the world. Today, Toronto Pearson operates within a voluntary network of airports. There are 11 airports in southern Ontario that work together. That is not a mandate; it's not regulated in any fashion, but it is a collaborative, co-operative network of airports that are looking forward to a day when there will be a demand of about 110 million passengers in southern Ontario and looking at how collectively we can service them.
On November 27th, 2018. See this statement in context.