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Table 2
Air: 2000 Data (unless noted)

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Airports

5,317 public-use airports
13,964 private-use airports

Airports serving large certificated carriers¹ 

29 large hubs (72 airports), 479 million enplaned passengers
31 medium hubs (53 airports), 102 million enplaned passengers
54 small hubs (69 airports), 40 million enplaned passengers
585 nonhubs (610 airports), 18 million enplaned passengers 

Aircraft

8,228 certificated air carrier aircraft,2 5.4 billion domestic miles flown² 
219,464 active general aviation aircraft³ (1999), 3.9 billion statute-miles flown⁴ (1997)

Passenger and freight companies⁵

75 carriers
616 million domestic revenue passenger enplanements
14.8 billion domestic ton-miles of freight

Certificated air carriers (domestic and international)

Majors: 14 carriers, 672,000 employees, 590 million revenue passenger enplanements
Nationals: 32 carriers, 56,000 employees, 80 million revenue passenger enplanements 
 Regionals: 29 carriers, 3,600 employees, 6 million revenue passenger enplanements

¹ U.S. Department of Transportation, Bureau of Transportation Statistics, Office of Airline Information, Airport Activity Statistics of Certificated Air Carriers, 12 Months Ending December 31, 2000 (Washington, DC: 2001).

² Aerospace Industries Association, Aerospace Facts and Figures (Washington, DC: 2000/2001). 

³ U.S. Department of Transportation, Federal Aviation Administration, General Aviation and Air Taxi Activity and Avionics Survey, Calendar Year 1999 (Washington, DC: 2001).

⁴ U.S. Department of Transportation, Federal Aviation Administration, General Aviation and Air Taxi Activity and Avionics Survey, Calendar Year 1997, FAA-APO-99-4 (Washington, DC: 1999).

⁵ U.S. Department of Transportation, Bureau of Transportation Statistics, Office of Airline Information, Air Carrier Traffic Statistics (Washington, DC: 2000).

SOURCE: U.S. Department of Transportation, Bureau of Transportation Statistics, National Transportation Statistics 2001, available at http://www.bts.gov.