Bureau of Transportation Statistics (BTS) — Compiles, analyzes, and makes accessible information on the Nation's transportation systems.
Federal Aviation Administration — Provides information about the department, its programs and services.
Federal Aviation Administration: Associate Administrator for Administration — Provides information about the AAD's organizational structure and functional overview; includes links to other offices.
Federal Aviation Administration: Associate Administrator for Commercial Space Transportation — Includes links to licensing, launch information, strategic plans, COMSTAC (Commercial Space Transportation Advisory Committee), and vehicles & sites.
Federal Aviation Administration: Office of Airports — Links to airports organization, airport planning, and financial assistance program guidance.
Federal Aviation Administration: William J. Hughes Technical Center — Information about the center, development and acquisition programs, technical program areas, and more.
U.S. Department of Transportation
U.S. Department of Transportation: Federal Highway Administration — Information about the office, its programs and services; includes links to press room, legislation and regulations, articles and The Transportation Equity Act for the 21st Century.
U.S. Department of Transportation: Federal Motor Carrier Safety Administration — Features links to safety programs, rules and regulations, and reports.
U.S. Department of Transportation: Federal Railroad Administration — Features regulations, orders, notices, legislation, policy studies, safety resources and more.
U.S. Department of Transportation: National Highway Traffic Safety Administration — Provides information about the office, its programs and services; includes links to CARS - Vehicle and Equipment Information, PEOPLE - Traffic Safety/Occupant Issues, What's Hot, and What's New.
U.S. Department of Transportation: Office of Hazardous Materials Safety — Includes FAQs, reports and documents, training information, risk management, and more.
U.S. Department of Transportation: Office of Pipeline Safety
U.S. Department of Transportation: Office of the Secretary
U.S. Department of Transportation: Surface Transportation Board — Independent adjudicatory body responsible for the economic regulation of interstate surface transportation.
U.S. Department of Transportation: United States Maritime Administration
United States Coast Guard

Environmental Protection Agency - Office of Transportation and Air Quality
U.S. House Committee on Transportation and Infrastructure — Oversees legislation on maritime travel, the Coast Guard, public buildings and ground transportation.
U.S. Senate Committee on Commerce, Science, and Transportation — Responsible for aviation, Communications Consumer Affairs, Foreign Commerce, and Tourism Manufacturing and Competitiveness Oceans and Fisheries Science, Technology, and Space Surface Transportation and Merchant Marine.