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Where are the busiest commercial passenger airports in the USA, and how are they distributed across the country ?
This Google Earth KML file mashes up a geographic database of FAA (Federal Aviation Authority) airport codes,  with passenger boarding totals (enplanements) for the year 2006.
Download the file here:
2200 Airports (USA) (150kB)
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Flight Maps Airports, Flight Maps, Google Earth, KML, USA