BTS 55-17 Thursday, November 16, 2017 BTS Contact: Dave Smallen Tel: 202-366-5568
BTS Statistics Release: August 2017 U.S. Airline Traffic Data
The U.S. Department of Transportation's Bureau of Transportation Statistics (BTS) reported today that U.S. airlines' August systemwide (domestic and international) scheduled service passenger enplanements fell 0.4 percent from July, falling to 71.3 million, seasonally-adjusted, after growing for seven consecutive months from December to July (Table 1).
From July 2017 to August 2017 enplanements on domestic flights declined 0.4 percent while enplanements on U.S. international flights to and from the U.S. fell 0.3 percent resulting in a 0.4 systemwide decline (Tables 1, 2, 3). Some of the decline could be due to Hurricane Harvey, which made landfall in Texas on Aug. 25.
In one year, from August 2016 to August 2017, enplanements on domestic flights increased 4.8 percent while enplanements on U.S. airline's international flights to and from the U.S. rose 5.5 percent, resulting in a 4.9 systemwide increase (Tables 1, 2, 3).
In three years, from August 2014 to August 2017, enplanements on domestic flights increased 12.6 percent while international enplanements rose 9.5 percent, resulting in a 12.2 systemwide increase (Tables 1, 2, 3).
In unadjusted numbers, systemwide, domestic and international enplanements all reached highs for the month of August (Tables 13, 14, 15).
Trends (Percent changes based on unrounded numbers) Seasonally-adjusted
The following seasonally-adjusted measures of U.S. airlines August air traffic reached all-time highs:
While systemwide and domestic ASMs reached new highs, international ASMs (29.0 billion) were down 0.4 percent from the all-time seasonally-adjusted high (29.1 billion) reached in June 2017 (Table 9).
Declines from seasonally-adjusted highs were also reported for the following measures of U.S. airlines August air traffic:
Load factor is a measure of the use of aircraft capacity that compares the system use, measured in RPMs as a proportion of system capacity, measured ASMs.
The systemwide seasonally-adjusted load factor declined 0.4 points from July to August as a result of a 0.3 percent decrease in RPMs from July to August combined with a 0.1 percent increase in ASMs (Tables 4, 7).
Seasonally adjusted trends are for the time period January 2000 to present. Additional data, including domestic and international numbers, can be found on the seasonally-adjusted data page.
Unadjusted
The following unadjusted measures of U.S. airlines August air traffic reached all-time highs for the month of August:
Declines from unadjusted August highs were reported for the following measures of U.S. airlines August air traffic:
Unadjusted trends are for the time period January 1996 to present. Data are available at Customize Table and can be downloaded from the seasonally-adjusted data page.
Explanation of seasonal adjustment When the primary purpose is to examine monthly shifts in transportation services output and analyze short-term trends, the variation introduced by normal seasonal changes must be removed from the data. Transportation is highly seasonal, and without adjustment, the data do not give an accurate picture of underlying changes in aviation, passenger travel.
Seasonal adjustment of the data removes the seasonal events that follow a regular seasonal pattern. Changes that are not due to seasonality, such as a change in air travel resulting from economic conditions become more readily apparent.
The aviation data are seasonally adjusted for the effects of trading day, moving holidays, and data outliers.
See Seasonal Adjustment for methodology and additional explanation.
Reporting Notes Data are compiled from monthly reports filed with BTS by commercial U.S. air carriers detailing operations, passenger traffic and freight traffic. This release includes data received by BTS from 80 carriers as of Nov. 7 for U.S. carrier scheduled civilian operations.
Go to http://www.transtats.bts.gov/releaseinfo.asp for the complete list of reporting and non-reporting carriers. U.S. carriers' foreign point-to-point flights are included in system and international totals. To create a customized table for passengers, flights, RPMs, ASMs and other data, including non-scheduled service, go to http://apps.bts.gov/xml/air_traffic/src/index.xml#CustomizeTable
For additional scheduled service numbers for U.S. and foreign airlines, by airline and by airport, see Passengers, Flights, Revenue Passenger-Miles, Available Seat-Miles and Load Factor.
Traffic numbers are available on the BTS website at TranStats, the Intermodal Transportation Database, at http://transtats.bts.gov. Click on "Aviation." For systemwide passengers, RPMs and ASMs by carrier through August, click on "Air Carrier Summary Data (Form 41 and 298C Summary Data)," and then click on "Schedule T-1." Use crosstabs to find scheduled service.
For domestic numbers through August and international numbers through May by origin as well as by carrier, click on "Aviation," then click on "Air Carrier Statistics (Form 41 Traffic)." Click on "T-100 Market" for system passenger numbers, "T-100 Domestic Market" for domestic or "T-100 International Market" for international. For flights, stage length and trip length, use the appropriate T-100 Segment database. Use crosstabs to find scheduled service.
International totals in this press release consist of all U.S. carrier operations to and from the U.S. and from one foreign point to another foreign point. TranStats T-100 systemwide and international totals do not include U.S. carriers' foreign point-to-point flights. For August, U.S. carriers reported 53,329 foreign point-to-point passengers. For January through August, U.S. carriers reported 458,459 foreign point-to-point passengers.
Data are subject to revision. BTS has scheduled Dec. 14 for the release of September traffic data. None of the data are from samples so measures of statistical significance do not apply.
Seasonally-Adjusted Tables
Passenger Enplanements on U.S. Airlines, Seasonally-Adjusted (Tables 1-3)
Table 1. Systemwide Passenger Enplanements on U.S. Airlines, Seasonally-Adjusted Systemwide (Domestic + International) passenger enplanements (seasonally adjusted) in millions (000,000) Scheduled service only
Source: Bureau of Transportation Statistics, T-100 Market
Table 2. Domestic Passenger Enplanements on U.S. Airlines, Seasonally-Adjusted Domestic passenger enplanements (seasonally adjusted) in millions (000,000) Scheduled service only
Source: Bureau of Transportation Statistics, T-100 Domestic Market
Table 3. International Passenger Enplanements on U.S. Airlines, Seasonally-Adjusted International passenger enplanements (seasonally adjusted) in millions (000,000) Scheduled service only
Source: Bureau of Transportation Statistics, T-100 International Market
Revenue Passenger-Miles on U.S. Airlines, Seasonally-Adjusted (Tables 4-6)
Table 4. Systemwide Revenue Passenger-Miles (RPMs) on U.S. Airlines, Seasonally-Adjusted Systemwide (Domestic + International) RPMs (seasonally-adjusted) in billions (000,000,000) Scheduled service only
Source: Bureau of Transportation Statistics, T-100 Segment Note: Revenue passenger-miles are a measure of the volume of air passenger transportation. A revenue passenger-mile is equal to one paying passenger carried one mile. Table 5. Domestic Revenue Passenger-Miles (RPMs) on U.S. Airlines, Seasonally-Adjusted Domestic RPMs (seasonally-adjusted) in billions (000,000,000) Scheduled service only
Source: Bureau of Transportation Statistics, T-100 Domestic Segment Note: Revenue passenger-miles are a measure of the volume of air passenger transportation. A revenue passenger-mile is equal to one paying passenger carried one mile.
Table 6. International Revenue Passenger-Miles (RPMs) on U.S. Airlines, Seasonally-Adjusted International RPMs (seasonally-adjusted) in billions (000,000,000) Scheduled service only
Source: Bureau of Transportation Statistics, T-100 International Segment Note: Revenue passenger-miles are a measure of the volume of air passenger transportation. A revenue passenger-mile is equal to one paying passenger carried one mile.
Available Seat-Miles on U.S. Airlines, Seasonally-Adjusted (Tables 7-9)
Table 7. Systemwide Available Seat-Miles (ASMs) on U.S. Airlines, Seasonally-Adjusted Systemwide (Domestic + International) ASMs (seasonally-adjusted) in billions (000,000,000) Scheduled service only
Source: Bureau of Transportation Statistics, T-100 Segment Note: Available seat-miles are a measure of the capacity of air passenger transportation. An available seat-mile is equal to one aircraft seat carried one mile.
Table 8. Domestic Available Seat-Miles (ASMs) on U.S. Airlines, Seasonally-Adjusted Domestic ASMs (seasonally-adjusted) in billions (000,000,000) Scheduled service only
Source: Bureau of Transportation Statistics, T-100 Domestic Segment Note: Available seat-miles are a measure of the capacity of air passenger transportation. An available seat-mile is equal to one aircraft seat carried one mile.
Table 9. International Available Seat-Miles (ASMs) on U.S. Airlines, Seasonally-Adjusted International ASMs (seasonally-adjusted) in billions (000,000,000) Scheduled service only
Source: Bureau of Transportation Statistics, T-100 International Segment Note: Available seat-miles are a measure of the capacity of air passenger transportation. An available seat-mile is equal to one aircraft seat carried one mile.
Load Factor on U.S. Airlines, Seasonally-Adjusted (Tables 10-12)
Table 10. Systemwide Load Factor on U.S. Airlines, Seasonally-Adjusted Systemwide (Domestic + International) RPMs/ASMs (both seasonally-adjusted) in percent Scheduled service only
Source: Bureau of Transportation Statistics, T-100 Segment Note: Load factor is a measure of the use of aircraft capacity that compares Revenue Passenger-Miles (RPMs) as a proportion of Available Seat-Miles (ASMs)
Table 11. Domestic Load Factor on U.S. Airlines, Seasonally-Adjusted Domestic RPMs/ASMs (both seasonally-adjusted) in percent Scheduled service only
Source: Bureau of Transportation Statistics, T-100 Domestic Segment Note: Load factor is a measure of the use of aircraft capacity that compares Revenue Passenger-Miles (RPMs) as a proportion of Available Seat-Miles (ASMs).
Table 12. International Load Factor on U.S. Airlines, Seasonally-Adjusted International RPMs/ASMs (both seasonally-adjusted) in percent Scheduled service only
Source: Bureau of Transportation Statistics, T-100 International Segment Note: Load factor is a measure of the use of aircraft capacity that compares Revenue Passenger-Miles (RPMs) as a proportion of Available Seat-Miles (ASMs)
Unadjusted Tables
Passenger Enplanements on U.S. Airlines, Unadjusted (Tables 13-15)
Table 13. Systemwide Passenger Enplanements on U.S. Airlines, Unadjusted Systemwide (Domestic + International) passenger enplanements (unadjusted) in millions (000,000) Scheduled service only
Source: Bureau of Transportation Statistics, T-100 Market
Table 14. Domestic Passenger Enplanements on U.S. Airlines, Unadjusted Domestic passenger enplanements (unadjusted) in millions (000,000) Scheduled service only
Source: Bureau of Transportation Statistics, T-100 Domestic Market
Table 15. International Passenger Enplanements on U.S. Airlines, Unadjusted International passenger enplanements (unadjusted) in millions (000,000) Scheduled service only
Source: Bureau of Transportation Statistics, T-100 International Market
Revenue Passenger-Miles on U.S. Airlines, Unadjusted (Tables 16-18)
Table 16. Systemwide Revenue Passenger-Miles (RPMs) on U.S. Airlines, Unadjusted Systemwide (Domestic + International) RPMs (unadjusted) in billions (000,000,000) Scheduled service only
Source: Bureau of Transportation Statistics, T-100 Segment Note: Revenue passenger-miles are a measure of the volume of air passenger transportation. A revenue passenger-mile is equal to one paying passenger carried one mile.
Table 17. Domestic Revenue Passenger-Miles (RPMs) on U.S. Airlines, Unadjusted Domestic RPMs (unadjusted) in billions (000,000,000) Scheduled service only
Source: Bureau of Transportation Statistics, T-100 Domestic Segment Note: Revenue passenger-miles are a measure of the volume of air passenger transportation. A revenue passenger-mile is equal to one paying passenger carried one mile.
Table 18. International Revenue Passenger-Miles (RPMs) on U.S. Airlines, Unadjusted International RPMs (unadjusted) in billions (000,000,000) Scheduled service only
Source: Bureau of Transportation Statistics, T-100 International Segment Note: Revenue passenger-miles are a measure of the volume of air passenger transportation. A revenue passenger-mile is equal to one paying passenger carried one mile.
Available Seat-Miles on U.S. Airlines, Unadjusted (Tables 19-21)
Table 19. Systemwide Available Seat-Miles (ASMs) on U.S. Airlines, Unadjusted Systemwide (Domestic + International) ASMs (unadjusted) in billions (000,000,000) Scheduled service only
Source: Bureau of Transportation Statistics, T-100 Segment Note: Available seat-miles are a measure of the capacity of air passenger transportation. An available seat-mile is equal to one aircraft seat carried one mile.
Table 20. Domestic Available Seat-Miles (ASMs) on U.S. Airlines, Unadjusted Domestic ASMs (unadjusted) in billions (000,000,000) Scheduled service only
Source: Bureau of Transportation Statistics, T-100 Domestic Segment Note: Available seat-miles are a measure of the capacity of air passenger transportation. An available seat-mile is equal to one aircraft seat carried one mile.
Table 21. International Available Seat-Miles (ASMs) on U.S. Airlines, Unadjusted International ASMs (unadjusted) in billions (000,000,000) Scheduled service only
Source: Bureau of Transportation Statistics, T-100 International Segment Note: Available seat-miles are a measure of the capacity of air passenger transportation. An available seat-mile is equal to one aircraft seat carried one mile.
Load Factor on U.S. Airlines, Unadjusted (Tables 22-24)
Table 22. Systemwide Load Factor on U.S. Airlines, Unadjusted Systemwide (Domestic + International) RPMs/ASMs (both unadjusted) in percent Scheduled service only
Source: Bureau of Transportation Statistics, T-100 Segment Note: Load factor is a measure of the use of aircraft capacity that compares Revenue Passenger-Miles (RPMs) as a proportion of Available Seat-Miles (ASMs).
Table 23. Domestic Load Factor on U.S. Airlines, Unadjusted Domestic RPMs/ASMs (both unadjusted) in percent Scheduled service only
Source: Bureau of Transportation Statistics, T-100 Segment Note: Load factor is a measure of the use of aircraft capacity that compares Revenue Passenger-Miles (RPMs) as a proportion of Available Seat-Miles (ASMs).
Table 24. International Load Factor on U.S. Airlines, Unadjusted International RPMs/ASMs (both unadjusted) in percent Scheduled service only
Source: Bureau of Transportation Statistics, T-100 Segment Note: Load factor is a measure of the use of aircraft capacity that compares Revenue Passenger-Miles (RPMs) as a proportion of Available Seat-Miles (ASMs). |
BTS Statistics Release: August 2017 U.S. Airline Traffic Data
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