Travel Trends

January 2018 U.S. Airline Traffic Data

Bureau of Transportation Statistics

U.S. airlines’ January systemwide (domestic and international) scheduled service passenger enplanements fell to 71.6 million, 0.8 percent fewer than December, seasonally-adjusted, after growing three consecutive months from October 2017 to December 2017 (Table 1).

Figure 1. Seasonally-Adjusted Systemwide Passenger Enplanements on All U.S. Scheduled Airlines (Domestic & International), January 2015 - January 2018

Enplanements in millions (Seasonally Adjusted)Graph - Enplanements in millions (Seasonally Adjusted)

In seasonally-adjusted numbers, from December 2017 to January 2018, enplanements on domestic flights declined 1.0 percent while enplanements on U.S. airlines’ international flights to and from the U.S. were virtually unchanged, resulting in a 0.8 percent systemwide decline (Tables 1, 2, 3).

In one year, from January 2017 to January 2018, enplanements on domestic flights increased 2.8 percent while enplanements on U.S. airlines’ international flights to and from the U.S. rose 1.8 percent, resulting in a 2.7 percent systemwide increase (Tables 1, 2, 3).

In three years, from January 2015 to January 2018, enplanements on domestic flights increased 10.9 percent while enplanements on U.S. airlines’ international flights to and from the U.S. rose 7.3 percent, resulting in a 10.5 percent systemwide increase (Tables 1, 2, 3).

In unadjusted numbers, systemwide, domestic and international enplanements all reached highs for the month of January (Tables 13, 14, 15).

Trends (Percent changes based on unrounded numbers)

Seasonally-adjusted

Systemwide passenger enplanements (71.6 million) were down 0.8 percent from the all-time seasonally-adjusted high (72.2 million) reached in December 2017 (Table 1). Domestic passenger enplanements (62.5 million) were down 1.0 percent from the all-time seasonally-adjusted high (63.1 million) reached in December 2017 (Table 2). International passenger enplanements (9.0 million) were down 0.9 percent from the all-time seasonally-adjusted high (9.1 million) reached in April 2017 (Table 3).           

Systemwide revenue passenger miles (RPMs) (81.5 billion) were down 0.3 percent from the all-time seasonally-adjusted high (81.7 billion) reached in November 2017 (Table 4). Domestic RPMs (57.9 billion) were down 0.4 percent from the all-time seasonally-adjusted high (58.2 billion) reached in November 2017 (Table 5). International RPMs (23.5 billion) were down 0.9 percent from the all-time seasonally-adjusted high (23.8 billion) reached in April 2017 (Table 6).

Systemwide available seat-miles (ASMs) (98.0 billion) reached a new seasonally-adjusted all-time high, up 0.3 percent from the previous high in December 2017 (97.7 billion) (Table 7). Domestic ASMs (68.8 billion) reached a new seasonally-adjusted all-time high, up 0.3 percent from the previous high in December 2017 (68.6 billion) (Table 8). International ASMs (29.2 billion) were virtually unchanged from the all-time seasonally-adjusted high (29.2 billion) reached in October 2017 (Table 9).

Systemwide load factor (83.1) was down 1.7 points from the all-time seasonally-adjusted high (84.7) reached in October 2015 (Table 10). Domestic load factor (84.2) was down 1.6 points from the all-time seasonally-adjusted high (85.8) reached in October 2015 (Table 11). International load factor (80.6) was down 2.5 points from the all-time seasonally-adjusted high (83.1) reached in March 2013 (Table 12).

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 seasonally-adjusted load factor fell from December (83.4) to January (83.1) as a result of no change in RPMs from December to January combined with a 0.3 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

Systemwide passenger enplanements (64.3 million) reached an all-time January high, up 2.7 percent from the previous high (62.6 million) reached in 2017 (Table 13). Domestic passenger enplanements (55.7 million) reached an all-time January high, up 3.0 percent from the previous high (54.1 million) reached in 2017 (Table 14). International passenger enplanements (8.6 million) reached an all-time January high, up 1.0 percent from the previous January high (8.5 million) reached in 2017 (Table 15).

Figure 2. Unadjusted Systemwide Passenger Enplanements on All U.S. Scheduled Airlines (Domestic & International), January 2015 - January 2018

Enplanements in millions (Unadjusted)Graph - Enplanements in millions (Unadjusted)

Systemwide RPMs (73.3 billion) reached an all-time January high, up 2.6 percent from the previous high (71.4 billion) reached in 2017 (Table 16). Domestic RPMs (51.7 billion) reached an all-time January high, up 3.1 percent from the previous high (50.1 billion) reached in 2017 (Table 17). International RPMs (21.6 billion) reached an all-time January high, up 1.6 percent from the previous high (21.3 billion) reached in 2017 (Table 18).

Systemwide ASMs (93.0 billion) reached an all-time January high, up 3.4 percent from the previous high (90.0 billion) reached in 2017 (Table 19). Domestic ASMs (65.5 billion) reached an all-time January high, up 3.9 percent from the previous high (63.1 billion) reached in 2017 (Table 20). International ASMs (27.5 billion) reached an all-time January high, up 2.3 percent from the previous high (26.9 billion) reached in 2017 (Table 21).

Systemwide load factor (78.8) was down 1.5 points from the all-time January high (80.3) reached in 2014 (Table 22). Domestic load factor (78.9) was down 1.8 points from the all-time January high (80.7) reached in 2014 (Table 23). International load factor (78.7) was down 0.9 points from the all-time January high (79.6) reached in 2014 (Table 24).           

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 78 carriers as of April 3 for U.S. carrier scheduled civilian operations.

Go to 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 https://www.transtats.bts.gov/TRAFFIC/

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.  Click on “Aviation.”  For systemwide passengers, RPMs and ASMs by carrier through January, 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 January and international numbers through October 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 January, U.S. carriers reported 38,037 foreign point-to-point passengers.

Data are subject to revision. BTS has scheduled May 10 for the release of February 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, January 2018

Systemwide (Domestic + International) passenger enplanements (seasonally-adjusted) in millions (000,000), Scheduled service only

2015201620172018
January 64.80 67.69 69.71 71.57
February 65.08 67.77 69.73

March 65.69 67.18 70.09

April 65.75 67.95 70.54

May 65.99 68.87 71.08

June 66.27 69.11 71.15

July 66.87 68.31 71.66

August 67.44 68.04 71.40

September 67.25 69.21 67.99

October 67.86 69.12 72.03

November 67.39 69.38 72.10

December 67.88 69.48 72.17

Export Table DataSource: 

Bureau of Transportation Statistics, T-100 Market

Table 2. Domestic Passenger Enplanements on U.S. Airlines, Seasonally-Adjusted, January 2018

Domestic passenger enplanements on U.S. airlines (seasonally-adjusted) in millions (000,000), Scheduled service only

2015201620172018
January 56.38 59.04 60.83 62.53
February 56.64 59.11 60.90

March 57.27 58.55 61.22

April 57.43 59.42 61.42

May 57.57 60.29 61.99

June 57.80 60.41 62.04

July 58.32 59.66 62.55

August 58.81 59.44 62.33

September 58.62 60.56 59.43

October 59.22 60.44 63.02

November 58.76 60.74 63.06

December 59.22 60.62 63.13

Export Table DataSource: 

Bureau of Transportation Statistics, T-100 Domestic Market

Table 3. International Passenger Enplanements on U.S. Airlines, Seasonally-Adjusted, January 2018

International passenger enplanements (seasonally-adjusted) in millions (000,000), Scheduled service only

2015201620172018
January 8.42 8.65 8.88 9.04
February 8.44 8.66 8.83

March 8.43 8.64 8.86

April 8.32 8.53 9.12

May 8.43 8.58 9.09

June 8.48 8.71 9.11

July 8.55 8.64 9.11

August 8.63 8.61 9.07

September 8.63 8.65 8.56

October 8.63 8.68 9.01

November 8.64 8.65 9.04

December 8.66 8.86 9.04

Export Table DataSource: 

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, January 2018

Systemwide (Domestic + International) RPMs (seasonally-adjusted) in billions (000,000,000), Scheduled service only

2015201620172018
January 73.2 76.6 79.3 81.5
February 73.6 76.9 78.7

March 74.5 76.4 79.5

April 74.0 77.1 80.4

May 74.6 77.7 80.6

June 74.9 78.2 80.9

July 75.6 77.7 81.4

August 76.1 77.1 81.2

September 75.9 78.3 77.9

October 76.8 78.2 81.5

November 76.2 78.5 81.7

December 77.0 78.9 81.5

Export Table DataNotes: 

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.

Source: 

Bureau of Transportation Statistics, T-100 Segment

Table 5. Domestic Revenue Passenger-Miles (RPMs) on U.S. Airlines, Seasonally-Adjusted, January 2018

Domestic RPMs (seasonally-adjusted) in billions (000,000,000), Scheduled service only

2015201620172018
January 50.7 53.8 56.3 57.9
February 51.1 54.1 55.7

March 51.9 53.8 56.4

April 51.9 54.5 56.7

May 52.1 55.2 57.1

June 52.4 55.4 57.3

July 52.8 54.8 57.8

August 53.2 54.6 57.6

September 53.1 55.4 54.9

October 53.8 55.4 58.1

November 53.5 55.7 58.2

December 54.2 55.8 58.0

Export Table DataNotes: 

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.

Source: 

Bureau of Transportation Statistics, T-100 Segment

Table 6. International Revenue Passenger-Miles (RPMs) on U.S. Airlines, Seasonally-Adjusted, January 2018

International RPMs (seasonally-adjusted) in billions (000,000,000), Scheduled service only

2015201620172018
January 22.5 22.8 23.0 23.5
February 22.5 22.7 23.0

March 22.6 22.7 23.1

April 22.1 22.6 23.8

May 22.5 22.6 23.5

June 22.5 22.8 23.6

July 22.8 22.9 23.5

August 22.9 22.6 23.6

September 22.8 22.9 23.0

October 22.9 22.8 23.4

November 22.7 22.7 23.6

December 22.8 23.1 23.5

Export Table DataNotes: 

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.

Source: 

Bureau of Transportation Statistics, T-100 Segment

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, January 2018

Systemwide (Domestic + International) ASMs (seasonally-adjusted) in billions (000,000,000), Scheduled service only

2015201620172018
January 88.2 91.4 95.0 98.0
February 87.6 92.1 94.9

March 88.7 92.6 95.2

April 89.4 92.5 95.7

May 89.7 93.1 96.0

June 89.5 93.2 96.8

July 90.3 93.3 97.3

August 90.6 93.5 97.3

September 90.6 94.0 95.4

October 90.6 93.3 97.5

November 91.1 93.5 97.2

December 91.5 94.3 97.7

Export Table DataNotes: 

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.

Source: 

Bureau of Transportation Statistics, T-100 Segment

Table 8. Domestic Available Seat-Miles (ASMs) on U.S. Airlines, Seasonally-Adjusted, January 2018

Domestic ASMs (seasonally-adjusted) in billions (000,000,000), Scheduled service only

2015201620172018
January 60.4 63.3 66.5 68.8
February 59.9 64.0 66.4

March 60.9 64.4 66.6

April 61.5 64.3 66.8

May 61.8 64.8 67.0

June 61.6 65.0 67.7

July 62.2 65.1 68.2

August 62.4 65.3 68.3

September 62.4 65.6 66.6

October 62.7 65.1 68.3

November 63.2 65.7 68.1

December 63.3 65.9 68.6

Export Table DataNotes: 

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.

Source: 

Bureau of Transportation Statistics, T-100 Segment

Table 9. International Available Seat-Miles (ASMs) on U.S. Airlines, Seasonally-Adjusted, January 2018

International ASMs (seasonally-adjusted) in billions (000,000,000), Scheduled service only

2015201620172018
January 27.8 28.1 28.5 29.2
February 27.7 28.1 28.6

March 27.8 28.2 28.6

April 27.9 28.1 28.9

May 27.9 28.3 29.0

June 27.8 28.3 29.1

July 28.1 28.2 29.1

August 28.2 28.3 29.0

September 28.2 28.3 28.7

October 27.8 28.2 29.2

November 27.9 27.7 29.0

December 28.2 28.4 29.1

Export Table DataNotes: 

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.

Source: 

Bureau of Transportation Statistics, T-100 Segment

Load Factor on U.S. Airlines, Seasonally-Adjusted (Tables 10-12)

Table 10. Systemwide Load Factor on U.S. Airlines, Seasonally-Adjusted, January 2018

Systemwide (Domestic + International) RPMs/ASMs (both seasonally-adjusted) in percent, Scheduled service only

2015201620172018
January 82.9 83.8 83.5 83.1
February 84.0 83.5 82.9

March 83.9 82.6 83.5

April 82.8 83.3 84.0

May 83.2 83.5 84.0

June 83.7 83.9 83.6

July 83.8 83.2 83.7

August 84.0 82.5 83.4

September 83.8 83.3 81.7

October 84.7 83.8 83.6

November 83.6 83.9 84.1

December 84.1 83.6 83.4

Export Table DataNotes: 

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).

Source: 

Bureau of Transportation Statistics, T-100 Segment

Table 11. Domestic Load Factor on U.S. Airlines, Seasonally-Adjusted, January 2018

Domestic RPMs/ASMs (both seasonally-adjusted) in percent, Scheduled service only

2015201620172018
January 83.9 85.1 84.6 84.2
February 85.2 84.6 83.9

March 85.2 83.5 84.7

April 84.4 84.7 84.8

May 84.3 85.1 85.2

June 85.0 85.3 84.6

July 84.9 84.2 84.8

August 85.2 83.6 84.3

September 85.1 84.4 82.3

October 85.8 85.1 85.1

November 84.6 84.8 85.4

December 85.7 84.6 84.6

Export Table DataNotes: 

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).

Source: 

Bureau of Transportation Statistics, T-100 Segment

Table 12. International Load Factor on U.S. Airlines, Seasonally-Adjusted, January 2018

International RPMs/ASMs (both seasonally-adjusted) in percent, Scheduled service only

2015201620172018
January 80.8 81.0 80.9 80.6
February 81.4 80.8 80.6

March 81.2 80.4 80.8

April 79.3 80.2 82.3

May 80.9 79.9 81.1

June 80.7 80.7 81.2

July 81.3 81.0 81.0

August 81.4 79.8 81.4

September 81.0 80.8 80.2

October 82.3 80.9 80.1

November 81.4 81.9 81.2

December 80.7 81.2 80.6

Export Table DataNotes: 

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).

Source: 

Bureau of Transportation Statistics, T-100 Segment

Unadjusted Tables   Passenger Enplanements on U.S. Airlines, Unadjusted (Tables 13-15)

Table 13. Systemwide Passenger Enplanements on U.S. Airlines, Unadjusted, January 2018

Systemwide (Domestic + International) passenger enplanements (unadjusted) in millions (000,000), Scheduled service only

2015201620172018
January 57.78 60.81 62.62 64.33
February 54.16 58.50 58.38

March 68.20 70.56 72.96

April 65.92 67.24 70.26

May 68.93 71.52 73.68

June 71.27 74.50 77.01

July 75.63 76.89 79.82

August 72.87 73.45 77.10

September 63.74 66.48 64.92

October 68.73 69.54 72.70

November 64.59 66.59 69.63

December 66.40 67.98 70.33

1 Mo. Total 57.78 60.81 62.62 64.33
Yr. Total 798.22 824.06 849.41

Export Table DataSource: 

Bureau of Transportation Statistics, T-100 Market

Table 14. Domestic Passenger Enplanements on U.S. Airlines, Unadjusted, January 2018

Domestic passenger enplanements (unadjusted) in millions (000,000), Scheduled service only

2015201620172018
January 49.73 52.47 54.11 55.74
February 47.17 51.11 51.08

March 59.56 61.59 63.96

April 57.70 58.89 61.10

May 60.25 62.75 64.44

June 61.81 64.76 66.75

July 65.13 66.14 68.58

August 62.77 63.50 66.67

September 55.99 58.62 57.15

October 60.89 61.71 64.62

November 57.15 59.27 61.91

December 57.87 59.18 61.37

1 Mo. Total 49.73 52.47 54.11 55.74
Yr. Total 696.02 719.99 741.74

Export Table DataSource: 

Bureau of Transportation Statistics, T-100 Domestic Market

Table 15. International Passenger Enplanements on U.S. Airlines, Unadjusted, January 2018

International passenger enplanements (unadjusted) in millions (000,000), Scheduled service only

2015201620172018
January 8.06 8.33 8.51 8.60
February 7.00 7.39 7.30

March 8.64 8.96 9.00

April 8.22 8.34 9.16

May 8.67 8.76 9.24

June 9.46 9.74 10.26

July 10.50 10.75 11.24

August 10.09 9.95 10.44

September 7.75 7.86 7.77

October 7.84 7.83 8.08

November 7.44 7.32 7.72

December 8.53 8.81 8.96

1 Mo. Total 8.06 8.33 8.51 8.60
Yr. Total 102.20 104.04 107.68

Export Table DataSource: 

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, January 2018

Systemwide (Domestic + International) RPMs (unadjusted) in billions (000,000,000), Scheduled service only

2015201620172018
January 66.0 69.3 71.4 73.3
February 59.8 64.6 64.3

March 75.8 78.7 80.8

April 73.1 75.1 79.5

May 78.0 80.8 83.5

June 82.7 86.5 89.7

July 88.3 90.6 94.1

August 85.2 86.1 90.4

September 72.5 75.3 74.7

October 76.1 77.3 80.6

November 70.0 72.2 75.7

December 74.8 77.0 79.6

1 Mo. Total 66.0 69.3 71.4 73.3
Yr. Total 902.2 933.5 964.4

Export Table DataNotes: 

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.

Source: 

Bureau of Transportation Statistics, T-100 Segment

Table 17. Domestic Revenue Passenger-Miles (RPMs) on U.S. Airlines, Unadjusted, January 2018

Domestic RPMs (unadjusted) in billions (000,000,000), Scheduled service only

2015201620172018
January 45.1 48.1 50.1 51.7
February 42.3 46.5 46.5

March 53.9 56.7 58.8

April 51.9 53.6 56.3

May 54.3 57.1 59.0

June 57.0 60.3 62.5

July 60.4 62.4 65.0

August 57.8 59.3 62.5

September 49.9 52.7 51.9

October 54.1 55.3 58.3

November 50.9 53.3 55.9

December 53.1 54.8 57.0

1 Mo. Total 45.1 48.1 50.1 51.7
Yr. Total 630.7 660.0 683.8

Export Table DataNotes: 

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.

Source: 

 Bureau of Transportation Statistics, T-100 Segment

Table 18. International Revenue Passenger-Miles (RPMs) on U.S. Airlines, Unadjusted, January 2018

International RPMs (unadjusted) in billions (000,000,000), Scheduled service only

2015201620172018
January 20.8 21.2 21.3 21.6
February 17.5 18.1 17.8

March 21.8 22.0 22.1

April 21.2 21.5 23.2

May 23.8 23.7 24.5

June 25.7 26.2 27.2

July 27.8 28.3 29.1

August 27.4 26.9 27.9

September 22.6 22.7 22.8

October 22.0 22.0 22.4

November 19.1 18.9 19.8

December 21.7 22.2 22.7

1 Mo. Total 20.8 21.2 21.3 21.6
Yr. Total 271.6 273.5 280.6

Export Table DataNotes: 

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.

Source: 

Bureau of Transportation Statistics, T-100 Segment

Available Seat-Miles on U.S. Airlines, Unadjusted (Tables 19-21)

Table 19. Systemwide Available Seat-Miles (ASMs) on U.S. Airlines, Unadjusted, January 2018

Systemwide (Domestic + International) ASMs (unadjusted) in billions (000,000,000), Scheduled service only

2015201620172018
January 83.4 86.3 90.0 93.0
February 74.5 82.0 81.4

March 90.3 94.2 96.8

April 88.6 91.6 94.8

May 92.8 96.4 99.5

June 95.7 99.9 103.7

July 101.0 104.4 108.6

August 98.6 101.8 105.8

September 87.3 90.4 91.4

October 89.5 92.2 96.4

November 84.9 86.9 90.3

December 90.3 93.0 96.3

1 Mo. Total 83.4 86.3 90.0 93.0
Yr. Total 1,076.9 1,119.1 1,155.0

Export Table DataNotes: 

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.

Source: 

Bureau of Transportation Statistics, T-100 Segment

Table 20. Domestic Available Seat-Miles (ASMs) on U.S. Airlines, Unadjusted, January 2018

Domestic ASMs (unadjusted) in billions (000,000,000), Scheduled service only

2015201620172018
January 57.0 59.7 63.1 65.5
February 51.3 57.5 57.4

March 62.9 66.5 68.7

April 61.1 63.8 66.1

May 63.4 66.5 68.8

June 65.2 68.8 71.7

July 68.6 71.5 74.8

August 66.7 70.0 73.2

September 59.5 62.5 63.1

October 62.6 64.8 68.0

November 60.5 62.9 65.1

December 63.2 65.7 68.2

1 Mo. Total 57.0 59.7 63.1 65.5
Yr. Total 742.0 780.2 808.2

Export Table DataNotes: 

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.

Source: 

Bureau of Transportation Statistics, T-100 Segment

Table 21. International Available Seat-Miles (ASMs) on U.S. Airlines, Unadjusted, January 2018

International ASMs (unadjusted) in billions (000,000,000), Scheduled service only

2015201620172018
January 26.4 26.7 26.9 27.5
February 23.3 24.5 23.9

March 27.5 27.7 28.0

April 27.5 27.8 28.7

May 29.4 29.8 30.6

June 30.5 31.1 32.0

July 32.4 32.9 33.8

August 31.9 31.9 32.6

September 27.8 27.9 28.3

October 27.0 27.4 28.4

November 24.5 24.0 25.1

December 27.0 27.3 28.0

1 Mo. Total 26.4 26.7 26.9 27.5
Yr. Total 335.2 339.0 346.3

Export Table DataNotes: 

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.

Source: 

Bureau of Transportation Statistics, T-100 Segment

Load Factor on U.S. Airlines, Unadjusted (Tables 22-24)

Table 22. Systemwide Load Factor on U.S. Airlines, Unadjusted, January 2018

Systemwide (Domestic + International) RPMs/ASMs (both unadjusted) in percent, Scheduled service only

2015201620172018
January 79.1 80.2 79.4 78.8
February 80.2 78.8 79.0

March 83.9 83.6 83.5

April 82.5 82.0 83.9

May 84.1 83.8 84.0

June 86.4 86.6 86.5

July 87.4 86.8 86.6

August 86.4 84.6 85.5

September 83.0 83.3 81.7

October 85.0 83.8 83.6

November 82.4 83.1 83.8

December 82.9 82.8 82.7

1 Mo. Value 79.1 80.2 79.4 78.8
Yr. Value 83.8 83.4 83.5

Export Table DataNotes: 

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).

Source: 

Bureau of Transportation Statistics, T-100 Segment

Table 23. Domestic Load Factor on U.S. Airlines, Unadjusted, January 2018

Domestic RPMs/ASMs (both unadjusted) in percent, Scheduled service only

2015201620172018
January 79.2 80.6 79.5 78.9
February 82.4 80.8 80.9

March 85.8 85.3 85.5

April 84.9 84.1 85.2

May 85.6 85.9 85.7

June 87.4 87.6 87.2

July 88.1 87.2 86.9

August 86.6 84.7 85.4

September 83.8 84.2 82.2

October 86.4 85.4 85.7

November 84.2 84.7 85.8

December 84.0 83.4 83.5

1 Mo. Value 79.2 80.6 79.5 78.9
Yr. Value 85.0 84.6 84.6

Export Table DataNotes: 

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).

Source: 

Bureau of Transportation Statistics, T-100 Segment

Table 24. International Load Factor on U.S. Airlines, Unadjusted, January 2018

International RPMs/ASMs (both unadjusted) in percent, Scheduled service only

2015201620172018

2015201620172018
January 78.8 79.5 79.2 78.7
February 75.3 73.9 74.3

March 79.5 79.4 78.7

April 77.1 77.3 80.8

May 80.8 79.3 80.1

June 84.4 84.5 84.9

July 85.8 86.0 85.9

August 86.0 84.3 85.8

September 81.4 81.1 80.5

October 81.6 80.1 78.7

November 78.1 78.9 78.6

December 80.3 81.2 80.8

1 Mo. Value 78.8 79.5 79.2 78.7
Yr. Value 81.0 80.7 81.0

Export Table DataNotes: 

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).

Source: 

Bureau of Transportation Statistics, T-100 Segment



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