There is no significance in counting only the people within an arbitrary geographic boundary that is a city’s legal jurisdiction. An airport serves a metropoli

There is no significance in counting only the people within an arbitrary geographic boundary that is a city’s legal jurisdiction. An airport serves a metropolitan region, composed of many cities, and there are at least 50 with 1M+ people. https://en.wikipedia.org/wiki/Metropolitan_statistical_area https://en.wikipedia.org/wiki/Metropolitan_statistical_area