Freight and mail carried by U.S. airlines in all service classes (schedule and nonscheduled) on international flights. A revenue ton-mile is the movement of one ton of revenue cargo carried for one mile. The Bureau of Transportation Statistics air traffic data from U.S. air carriers and international carriers operating within the U.S.

Methodology for page with interactive map and graph showing access to intercity transportation in rural areas

The Bureau of Transportation Statistics releases non-seasonally adjusted air traffic data based on monthly reports from commercial U.S. air carriers.

Rail carload traffic is comprised of mostly bulk commodities, such as coal and agricultural products. The Association of American Railroads releases data on carloads and intermodal units originated by U.S. railroads on a weekly and monthly basis.

Airports with scheduled service and intercity bus and intercity rail (Amtrak/Alaska rail) facilities for years 2006, 2012, and 2018. Used to find rural areas with access to one or more of these transportation modes: https://data.transportation.gov/Research-and-Statistics/Access-to-Intercity-Transportation-in-Rural-Areas/29cj-8s4a .

Interactive map showing access to intercity transportation in rural areas:
https://datahub.transportation.gov/stories/s/Rural-Access-to-Intercity-Transportation/gr9y-9gjq/edit

Methodology:
https://datahub.transportation.gov/stories/s/dbb4-pr2c

Freight and mail carried by U.S. airlines in all service classes (schedule and nonscheduled) on domestic flights. The Bureau of Transportation Statistics collects air traffic data from U.S. air carriers and international carriers operating within the U.S.

The Federal Highway Administration's National Highway Construction Cost Index (NHCCI) is a quarterly price index intended to measure the average changes in the prices of highway construction costs over time and to convert current-dollar highway construction expenditures to real dollar expenditures.

General aviation fatalities include private aviation operations and excludes Federal Aviation Regulation (FAR) Part 121 (Air Carriers), 129 (Foreign), 135 (On-Demand), and Non-U.S./Commercial operations. The National Transportation Safety Board releases aviation fatality data in the Aviation Accident Database.

Economic concepts related to highway transportation cost index.

List of subtopics related to the value of transportation infrastructure and other assets