Houston George Bush Intercontinental Airport ranked 80th. http://www.worldairportawards.com/Awards_2013/top100.htm Not a single US airport that came in the top 25...
LaGuardia Airport is 8 miles from midtown Manhattan. Midway Airport is 8 miles from Chicago's Loop. Hobby Airport is 7 miles from Downtown. Those airports are so close to central business districts, why not Houston?