KEY: N = data are nonexistent.
NOTES: Commercial service airports
are defined in box 2-B in chapter two.
Only percentage data are readily
available. The number of commercial
service airports vary from year to year.
In 2004, there were 513 commercial service airports.
Data for 1994-1996 are nonexistent.
SOURCES: 1997-2003—U.S. Department of Transportation (USDOT), Research and Innovative Technology Administration, Bureau of Transportation Statistics, National Transportation Statistics 2004, table 1-24, available at http://www.bts.gov/, as of January 2005. 2004—USDOT, Federal Aviation Administration, National Planning Division, personal communication, February 2005.