Large national airport. I think there's something to be said for having more than one large airport, in competition with each other, in any large enough major

Large national airport. I think there's something to be said for having more than one large airport, in competition with each other, in any large enough major metro area. Single-airport cities in my not-pluralizable-to-data experience have more problems with rental car shortages, weather, and traffic. Perhaps it's just a question of number of airports per population and/or land area. About 1 per million people seems about right, even though the Bay Area falls shy of that. http://en.wikipedia.org/wiki/Table_of_United_States_Metropolitan_Statistical_Areas http://en.wikipedia.org/wiki/Table_of_United_States_Metropol... http://en.wikipedia.org/wiki/List_of_the_100_largest_metropolitan_areas_in_Canada http://en.wikipedia.org/wiki/List_of_the_100_largest_metropo... http://en.wikipedia.org/wiki/List_of_metropolitan_areas_by_population http://en.wikipedia.org/wiki/List_of_metropolitan_areas_by_p... Is there a convenient count of major and/or minor commercial airports for these areas?