Monthly data, seasonally adjusted
Monthly data, seasonally adjusted (millions of dollars)
NOTES: Runways include pavement and lighting. Other categories that are included for the air transportation total but do not have monthly state and local estimates are air freight terminals, air traffic towers, hangars, and other related facilities and structures.
SOURCE: U.S. Department of Commerce, Bureau of the Census; September 2007; available at: http://www.census.gov/const/www/c30index.html.