Airports - with unpaved runways:
total: 9,739
over 3,047 m: 1
2,438 to 3,047 m: 6
1,524 to 2,437 m: 157
914 to 1,523 m: 1,728
under 914 m: 7,847 (2006)
Heliports:
149 (2006)
Pipelines:
petroleum products 244,620 km; natural gas 548,665 km (2003)
Railways:
total: 226,605 km
standard gauge: 226,605 km 1.435-m gauge (2004)
Roadways:
total: 6,407,637 km
paved: 4,164,964 km (including 74,950 km of expressways)
unpaved: 2,242,673 km (2004)
Waterways:
41,009 km (19,312 km used for commerce)
note: Saint Lawrence Seaway of 3,769 km, including the Saint
Lawrence River of 3,058 km, shared with Canada (2004)
Merchant marine:
total: 465 ships (1000 GRT or over) 10,590,325 GRT/13,273,133 DWT
by type: barge carrier 7, bulk carrier 67, cargo 91, chemical tanker
20, container 76, passenger 19, passenger/cargo 58, petroleum tanker
76, refrigerated cargo 3, roll on/roll off 27, specialized tanker 1,
vehicle carrier 20
foreign-owned: 51 (Australia 2, Canada 4, Denmark 24, Germany 2,
Greece 1, Malaysia 4, Netherlands 4, Norway 2, Singapore 2, Sweden
5, Taiwan 1)
registered in other countries: 700 (Antigua and Barbuda 7, Australia
3, Bahamas 121, Belize 5, Bermuda 27, Cambodia 8, Canada 2, Cayman
Islands 41, Comoros 2, Cyprus 7, Greece 1, Honduras 1, Hong Kong 21,
Ireland 2, Isle of Man 3, Italy 15, North Korea 3, South Korea 7,
Liberia 93, Luxembourg 3, Malta 3, Marshall Islands 143, Netherlands
13, Netherlands Antilles 1, Norway 13, Panama 94, Peru 1,
Philippines 8, Portugal 1, Puerto Rico 3, Qatar 1, Russia 1, Saint
Vincent and the Grenadines 21, Sierra Leone 1, Singapore 7, Spain 7,
Sweden 1, Trinidad and Tobago 1, UK 6, Vanuatu 1, Wallis and Futuna
1) (2006)
Ports and terminals:
Corpus Christi, Duluth, Hampton Roads, Houston, Long Beach, Los
Angeles, New Orleans, New York, Philadelphia, Tampa, Texas City
note: 13 ports north of New Orleans (South Louisiana Ports) on the
Mississippi River handle 290,000,000 tons of cargo annually
Military United States
Military branches:
Army, Navy and Marine Corps, Air Force, and Coast Guard; note -
Coast Guard administered in peacetime by the Department of Homeland
Security, but in wartime reports to the Department of the Navy