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"A three-year review into the future of air travel around London is due to finish with the recommendation that a new runway be built at one of two existing airports. But while the capital gingerly edges towards airport expansion, other parts of the world are witnessing a massive airport building boom."

. It cites a very lengthy list, but some of them are: Home to major stock exchanges and indexes Influential in international political affairs Home to world-renowned cultural institutions Service a major media hub Large mass transit networks Home to a large international airport Having a prominent skyline