Total Serviceable Airports is a value that may directly reflect the developmental quality of a particular nation. Airports support a country by allowing access for economic and military purposes. As such, they serve a critical logistical-minded role during war time and become the primary targets of an attacking force. Only major serviceable airports are taken into account for the GFP ranking, generally including prepared airfields with some support facilities.
Serviceable Airports data through 2013.
Sources: CIA.gov, CIA World Factbook, wikipedia.com, public domain print and media sources and user contributions. Some values may be estimated when official sources are lacking.