BTS 04-18

Thursday, January 11, 2018

Contact: Dave Smallen

Tel: 202-366-5568

david.smallen@dot.gov

 

 

BTS Statistics Release: October 2017 U.S. Airline Traffic Data

 

The U.S. Department of Transportation’s Bureau of Transportation Statistics (BTS) reported today that U.S. airlines’ October systemwide (domestic and international) scheduled service passenger enplanements rose 6.0 percent from September, rising to 72.1 million to reach a new all-time seasonally-adjusted high, after falling for two consecutive months (Table 1).

 

 

 

In October, domestic travel numbers on U.S. airlines resumed the growth from previous years that had taken place prior to September. In that month, air travel numbers were reduced primarily due to the impact of hurricanes in the southern U.S.

 

 

From September 2017 to October 2017, enplanements on domestic flights rose 6.1 percent while enplanements on U.S. airlines’ international flights to and from the U.S. rose 5.4 percent, resulting in a 6.0 percent systemwide increase (Tables 1, 2, 3).

 

In one year, from October 2016 to October 2017, enplanements on domestic flights increased 4.3 percent while enplanements on U.S. airlines’ international flights to and from the U.S. rose 3.9 percent, resulting in a 4.2 systemwide increase (Tables 1, 2, 3).

 

In three years, from October 2014 to October 2017, enplanements on domestic flights increased 14.0 percent while enplanements on U.S. airlines’ international flights to and from the U.S. rose 9.8 percent, resulting in a 13.4 systemwide increase (Tables 1, 2, 3).

 

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

 

Trends (Percent changes based on unrounded numbers)

Seasonally-adjusted

 

The following seasonally-adjusted measures of U.S. airlines October air traffic reached all-time highs:

 

• Systemwide passenger enplanements (72.2 million) reached a new seasonally-adjusted all-time high, up 0.7 percent from the previous high in July 2017 (71.6 million) (Table 1). 

• International ASMs (29.3 billion) reached a new seasonally-adjusted all-time high, up 0.7 percent from the previous high in June 2017 (29.1 billion) (Table 9). 

International passenger enplanements and international RPMs declined from the all-time highs:

 

• International passenger enplanements (9.0 million) were down 1.0 percent from the all-time seasonally-adjusted high (9.1 million) reached in July 2017 (Table 3). 

• International RPMs (23.4 billion) were down 1.5 percent from the all-time seasonally-adjusted high (23.7 billion) reached in April 2017 (Table 6).

Systemwide, domestic and international load factors were down from the all-time highs: 

• Systemwide load factor (83.6 percent) was down 1.2 percentage points from the all-time seasonally-adjusted high (84.8 percent) reached in October 2015 (Table 10). 

• International load factor (79.8 percent) was down 3.4 points from the all-time seasonally-adjusted high (83.2 percent) 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 rose from September (81.7 percent) to October (83.6 percent) because passenger travel grew faster (4.7 percent increase in RPMs) than system capacity (2.3 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

 

 

 

The following unadjusted measures of U.S. airlines October air traffic reached highs for the month of October:

 

• Systemwide passenger enplanements (72.7 million) reached an all-time October high, up 4.5 percent from the previous high (69.5 million) reached in 2016 (Table 13). 

• International ASMs (28.4 billion) reached an all-time October high, up 3.8 percent from the previous high (27.4 billion) reached in 2016 (Table 21).

Systemwide, domestic and international load factors were down from the October highs:

 

• Systemwide load factor (83.6 percent) was down 1.4 points from the all-time October high (85.0 percent) reached in 2015 (Table 22). 

• International load factor (78.7 percent) was down 3.8 points from the all-time October high (82.4 percent) reached in 2010 (Table 24).

 

The unadjusted load factor declined from October 2016 (83.8 percent) to October 2017 (83.6 percent) because passenger travel grew more slowly (4.3 percent increase in RPMs) than system capacity (4.6 percent increase in ASMs) (Tables 16, 19).

 

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 79 carriers as of Jan. 2 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 October, 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 October and international numbers through July 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 October, U.S. carriers reported 48,429 foreign point-to-point passengers. For January through October, U.S. carriers reported 552,659 foreign point-to-point passengers.

 

Data are subject to revision. BTS has scheduled Feb. 15 for the release of November 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

	2014	2015	2016	2017
January	62.81	64.79	67.64	69.58
February	63.14	65.05	67.67	69.57
March	63.94	65.65	67.10	69.94
April	63.51	65.71	67.89	70.44
May	63.50	65.98	68.84	70.99
June	63.43	66.25	69.09	71.10
July	63.66	66.87	68.32	71.64
August	63.58	67.45	68.07	71.43
September	63.75	67.33	69.31	68.08
October	63.62	67.92	69.22	72.15
November	64.01	67.46	69.50
December	64.13	67.91	69.55

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

	2014	2015	2016	2017
January	54.48	56.37	59.00	60.71
February	54.81	56.61	59.02	60.76
March	55.57	57.23	58.46	61.08
April	55.14	57.39	59.37	61.33
May	55.11	57.56	60.27	61.91
June	55.07	57.78	60.38	61.99
July	55.35	58.32	59.68	62.53
August	55.27	58.82	59.46	62.35
September	55.47	58.70	60.66	59.52
October	55.40	59.29	60.54	63.12
November	55.68	58.80	60.81
December	55.75	59.25	60.70

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

	2014	2015	2016	2017
January	8.33	8.42	8.64	8.87
February	8.33	8.43	8.65	8.81
March	8.37	8.42	8.63	8.85
April	8.38	8.32	8.52	9.11
May	8.39	8.42	8.57	9.09
June	8.36	8.47	8.71	9.11
July	8.31	8.55	8.64	9.11
August	8.31	8.64	8.61	9.07
September	8.28	8.63	8.65	8.56
October	8.22	8.64	8.69	9.02
November	8.34	8.66	8.69
December	8.37	8.66	8.85

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

	2014	2015	2016	2017
January	71.0	73.1	76.5	79.1
February	71.4	73.6	76.8	78.5
March	72.2	74.4	76.4	79.4
April	71.7	74.0	77.0	80.3
May	71.9	74.6	77.7	80.6
June	71.6	74.9	78.2	80.9
July	71.7	75.7	77.8	81.4
August	71.8	76.1	77.2	81.2
September	72.0	75.9	78.4	77.9
October	72.0	76.8	78.3	81.6
November	72.4	76.3	78.6
December	73.1	77.0	78.8

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

	2014	2015	2016	2017
January	48.8	50.7	53.7	56.1
February	49.2	51.0	54.1	55.5
March	49.9	51.8	53.7	56.3
April	49.3	51.8	54.5	56.6
May	49.4	52.1	55.2	57.0
June	49.3	52.4	55.4	57.3
July	49.6	52.8	54.9	57.9
August	49.6	53.2	54.6	57.7
September	49.8	53.1	55.5	54.9
October	49.9	53.9	55.5	58.2
November	50.1	53.5	55.8
December	50.7	54.2	55.8

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

	2014	2015	2016	2017
January	22.3	22.5	22.8	23.0
February	22.2	22.5	22.7	23.0
March	22.3	22.6	22.7	23.1
April	22.4	22.1	22.6	23.7
May	22.5	22.5	22.6	23.5
June	22.3	22.5	22.8	23.6
July	22.0	22.8	22.9	23.5
August	22.2	22.9	22.5	23.5
September	22.2	22.8	22.9	23.0
October	22.1	22.9	22.8	23.4
November	22.3	22.8	22.8
December	22.4	22.8	23.1

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

	2014	2015	2016	2017
January	84.3	88.2	91.4	94.9
February	85.1	87.6	92.1	94.9
March	86.4	88.7	92.6	95.2
April	85.5	89.4	92.5	95.7
May	85.6	89.7	93.1	96.0
June	86.2	89.5	93.2	96.8
July	86.3	90.3	93.4	97.3
August	86.2	90.6	93.5	97.3
September	86.6	90.6	94.0	95.4
October	87.1	90.6	93.4	97.6
November	87.5	91.1	93.4
December	88.1	91.5	94.3

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

	2014	2015	2016	2017
January	57.3	60.4	63.3	66.5
February	57.9	59.9	64.0	66.4
March	58.8	60.9	64.4	66.6
April	58.3	61.5	64.3	66.8
May	58.2	61.8	64.8	67.0
June	58.4	61.6	65.0	67.7
July	58.7	62.2	65.1	68.2
August	58.7	62.4	65.2	68.3
September	59.1	62.4	65.6	66.6
October	59.6	62.8	65.2	68.3
November	59.7	63.2	65.6
December	60.3	63.3	65.9

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

	2014	2015	2016	2017
January	27.0	27.8	28.1	28.4
February	27.3	27.6	28.1	28.5
March	27.6	27.8	28.2	28.6
April	27.3	27.9	28.1	28.9
May	27.4	27.9	28.2	29.0
June	27.7	27.9	28.3	29.1
July	27.6	28.1	28.2	29.1
August	27.5	28.2	28.3	29.0
September	27.4	28.2	28.4	28.8
October	27.4	27.9	28.2	29.3
November	27.8	27.9	27.7
December	27.8	28.2	28.3

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

	2014	2015	2016	2017
January	84.3	82.9	83.7	83.3
February	83.9	84.0	83.4	82.8
March	83.6	83.9	82.5	83.4
April	83.8	82.8	83.3	84.0
May	84.0	83.2	83.5	83.9
June	83.1	83.7	83.9	83.6
July	83.1	83.8	83.3	83.7
August	83.3	84.0	82.5	83.4
September	83.1	83.8	83.4	81.7
October	82.7	84.8	83.8	83.6
November	82.8	83.7	84.2
December	82.9	84.1	83.6

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

	2014	2015	2016	2017
January	85.2	83.8	84.9	84.3
February	85.0	85.1	84.5	83.7
March	84.9	85.1	83.4	84.5
April	84.6	84.4	84.6	84.7
May	84.9	84.3	85.1	85.1
June	84.4	85.0	85.2	84.6
July	84.6	85.0	84.3	84.9
August	84.5	85.3	83.7	84.4
September	84.2	85.1	84.5	82.4
October	83.7	85.9	85.2	85.2
November	84.0	84.7	85.1
December	83.9	85.6	84.6

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

	2014	2015	2016	2017
January	82.3	80.9	81.1	81.1
February	81.5	81.5	80.9	80.7
March	80.6	81.2	80.4	80.8
April	82.1	79.3	80.2	82.3
May	82.2	80.9	79.9	81.1
June	80.5	80.7	80.7	81.1
July	79.7	81.2	80.9	80.9
August	80.7	81.3	79.6	81.2
September	80.9	80.9	80.6	79.9
October	80.6	82.2	80.8	79.8
November	80.1	81.5	82.2
December	80.7	80.7	81.4

 

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

	2014	2015	2016	2017
January	55.81	57.78	60.81	62.60
February	52.44	54.16	58.50	58.35
March	66.44	68.20	70.56	72.93
April	63.49	65.92	67.24	70.24
May	66.51	68.93	71.52	73.65
June	68.60	71.27	74.50	76.98
July	71.89	75.63	76.89	79.79
August	69.53	72.87	73.45	77.07
September	59.99	63.74	66.48	64.89
October	64.49	68.73	69.54	72.67
November	59.74	64.59	66.59
December	63.78	66.40	67.98
10 Mo. Total	639.19	667.23	689.49	709.17
Yr. Total	762.71	798.22	824.06

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

	2014	2015	2016	2017
January	47.96	49.73	52.47	54.09
February	45.51	47.17	51.11	51.05
March	57.76	59.56	61.59	63.93
April	55.25	57.70	58.89	61.07
May	57.89	60.25	62.75	64.42
June	59.26	61.81	64.76	66.72
July	61.76	65.13	66.14	68.55
August	59.76	62.77	63.50	66.64
September	52.53	55.99	58.62	57.12
October	57.08	60.89	61.71	64.59
November	52.58	57.15	59.27
December	55.49	57.87	59.18
10 Mo. Total	554.76	581.00	601.54	618.18
Yr. Total	662.83	696.02	719.99

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

	2014	2015	2016	2017
January	7.85	8.06	8.33	8.51
February	6.93	7.00	7.39	7.30
March	8.68	8.64	8.96	9.00
April	8.24	8.22	8.34	9.16
May	8.62	8.67	8.76	9.24
June	9.34	9.46	9.74	10.26
July	10.13	10.50	10.75	11.24
August	9.77	10.09	9.95	10.44
September	7.46	7.75	7.86	7.77
October	7.41	7.84	7.83	8.08
November	7.16	7.44	7.32
December	8.29	8.53	8.81
10 Mo. Total	84.43	86.23	87.91	91.00
Yr. Total	99.88	102.20	104.04

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

	2014	2015	2016	2017
January	64.1	66.0	69.3	71.4
February	57.9	59.8	64.6	64.2
March	73.6	75.8	78.7	80.8
April	70.7	73.1	75.1	79.5
May	75.2	78.0	80.8	83.5
June	79.5	82.7	86.5	89.7
July	83.7	88.3	90.6	94.1
August	81.2	85.2	86.1	90.4
September	68.4	72.5	75.3	74.6
October	71.3	76.1	77.3	80.6
November	65.2	70.0	72.2
December	71.8	74.8	77.0
10 Mo. Total	725.6	757.4	784.3	808.9
Yr. Total	862.5	902.2	933.5

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

	2014	2015	2016	2017
January	43.6	45.1	48.1	50.1
February	40.5	42.3	46.5	46.5
March	51.9	53.9	56.7	58.8
April	49.3	51.9	53.6	56.3
May	51.5	54.3	57.1	59.0
June	54.0	57.0	60.3	62.5
July	56.9	60.4	62.4	65.0
August	54.6	57.8	59.3	62.5
September	46.3	49.9	52.7	51.9
October	50.1	54.1	55.3	58.2
November	46.4	50.9	53.3
December	50.3	53.1	54.8
10 Mo. Total	498.7	526.6	551.9	570.7
Yr. Total	595.3	630.7	660.0

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

	2014	2015	2016	2017
January	20.5	20.8	21.2	21.3
February	17.3	17.5	18.1	17.8
March	21.8	21.8	22.0	22.1
April	21.5	21.2	21.5	23.2
May	23.7	23.8	23.7	24.5
June	25.5	25.7	26.2	27.2
July	26.8	27.8	28.3	29.1
August	26.6	27.4	26.9	27.9
September	22.1	22.6	22.7	22.8
October	21.2	22.0	22.0	22.4
November	18.8	19.1	18.9
December	21.5	21.7	22.2
10 Mo. Total	226.9	230.8	232.4	238.2
Yr. Total	267.2	271.6	273.5

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

	2014	2015	2016	2017
January	79.8	83.4	86.3	90.0
February	72.5	74.5	82.0	81.4
March	88.2	90.3	94.2	96.7
April	84.8	88.6	91.6	94.8
May	88.5	92.8	96.4	99.5
June	92.0	95.7	99.9	103.7
July	96.5	101.0	104.4	108.6
August	94.0	98.6	101.8	105.8
September	83.5	87.3	90.4	91.4
October	86.1	89.5	92.2	96.4
November	81.7	84.9	86.9
December	86.8	90.3	93.0
10 Mo. Total	865.9	901.7	939.2	968.3
Yr. Total	1,034.4	1,076.9	1,119.1

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

	2014	2015	2016	2017
January	54.0	57.0	59.7	63.1
February	49.4	51.3	57.5	57.4
March	60.7	62.9	66.5	68.7
April	58.0	61.1	63.8	66.1
May	59.7	63.4	66.5	68.8
June	61.8	65.2	68.8	71.7
July	64.8	68.6	71.5	74.8
August	62.9	66.7	70.0	73.2
September	56.5	59.5	62.5	63.1
October	59.6	62.6	64.8	68.0
November	56.9	60.5	62.9
December	60.3	63.2	65.7
10 Mo. Total	587.4	618.3	651.6	674.9
Yr. Total	704.6	742.0	780.2

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

	2014	2015	2016	2017
January	25.8	26.4	26.7	26.9
February	23.1	23.3	24.5	23.9
March	27.5	27.5	27.7	28.0
April	26.8	27.5	27.8	28.7
May	28.8	29.4	29.8	30.6
June	30.2	30.5	31.1	32.0
July	31.7	32.4	32.9	33.8
August	31.1	31.9	31.9	32.6
September	27.0	27.8	27.9	28.3
October	26.5	27.0	27.4	28.4
November	24.7	24.5	24.0
December	26.6	27.0	27.3
10 Mo. Total	278.5	283.7	287.7	293.2
Yr. Total	329.8	335.2	339.0

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

	2014	2015	2016	2017
January	80.3	79.1	80.2	79.4
February	79.8	80.2	78.8	79.0
March	83.5	83.9	83.6	83.5
April	83.4	82.5	82.0	83.9
May	85.0	84.1	83.8	84.0
June	86.4	86.4	86.6	86.4
July	86.7	87.4	86.8	86.6
August	86.5	86.4	84.6	85.5
September	81.9	83.0	83.3	81.6
October	82.8	85.0	83.8	83.6
November	79.8	82.4	83.1
December	82.6	82.9	82.8
10 Mo. Value	83.8	84.0	83.5	83.5
Yr. Value	83.4	83.8	83.4

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

	2014	2015	2016	2017
January	80.7	79.2	80.6	79.5
February	82.1	82.4	80.8	80.9
March	85.5	85.8	85.3	85.5
April	84.9	84.9	84.1	85.2
May	86.3	85.6	85.9	85.7
June	87.4	87.4	87.6	87.1
July	87.8	88.1	87.2	86.9
August	86.9	86.6	84.7	85.4
September	82.1	83.8	84.2	82.2
October	84.1	86.4	85.4	85.6
November	81.4	84.2	84.7
December	83.5	84.0	83.4
10 Mo. Value	84.9	85.2	84.7	84.6
Yr. Value	84.5	85.0	84.6

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

	2014	2015	2016	2017
January	79.6	78.8	79.5	79.2
February	75.0	75.3	73.9	74.3
March	79.2	79.5	79.4	78.7
April	80.1	77.1	77.3	80.8
May	82.3	80.8	79.3	80.1
June	84.4	84.4	84.5	84.9
July	84.4	85.8	86.0	85.9
August	85.5	86.0	84.3	85.8
September	81.6	81.4	81.1	80.5
October	79.8	81.6	80.1	78.7
November	76.2	78.1	78.9
December	80.8	80.3	81.2
10 Mo. Value	81.4	81.4	80.8	81.2
Yr. Value	81.0	81.0	80.7

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).