U.S. Department of Transportation

Airline Fuel Cost and Consumption (U.S. Carriers - Scheduled)

Domestic Freight Ton-Miles by Mode in U.S.

Seasonally-Adjusted Data : Statisticians use the process of seasonal-adjustment to uncover trends in data. Monthly data, for instance, are influenced by the number of days and the number of weekends in a month as well as by the timing of holidays and seasonal activity. These influences make it difficult to see underlying changes in the data. Statisticians use seasonal adjustment to control for these influences. Controlling of seasonal influences allows measurement of real monthly changes; short and long term patterns of growth or decline; and turning points. Data for one month can be compared to data for any other month in the series and the data series can be ranked to find high and low points.

Note: Values have been converted to millions from thousand to maintain uniformity. Methodology: Thousand values multiplied with "0.001" to convert into million.

National Transportation Statistics presents statistics on the U.S. transportation system, including its physical components, safety record, economic performance, the human and natural environment, and national security.