Lots of old airports are a clusterfuck. Those places were built in the middle of nowhere 70-100 years ago but now find themselves practically inside the megacity.
Increased traffic and incredibly complicated approach routes does the rest.
Increased traffic and incredibly complicated approach routes does the rest.
These issues are obvious to airport management, but airports cannot expand because nearby land is already allocated. The easiest option is to build a new airport, far from existing development.
Most of these airports were originally built far away from the city, but in the past half century the cities expanded so they new envelop the airport.