Major U.S. Air Carrier On-time Performance

Thursday, September 6, 2012

Date	Cancelled	Diverted	Depart Late	Arrive Late	Operations	Trend for Arrive Late
Sep-87	0.90	0.20	13.66	22.91	427,570	25.30
Oct-87	0.67	0.19	11.52	19.61	448,620	24.85
Nov-87	1.23	0.26	15.45	23.84	422,803	24.83
Dec-87	2.61	0.43	25.11	33.49	440,403	24.81
Jan-88	3.61	0.53	23.00	30.65	436,950	24.04
Feb-88	1.77	0.31	17.88	25.24	412,579	22.68
Mar-88	0.70	0.24	14.13	21.10	445,080	21.34
Apr-88	0.56	0.25	11.86	17.33	427,325	20.61
May-88	0.60	0.25	12.79	18.03	435,916	19.86
Jun-88	0.28	0.22	10.72	15.62	431,299	18.90
Jul-88	0.62	0.33	13.47	18.46	441,118	18.89
Aug-88	0.55	0.28	12.35	17.04	446,769	18.93
Sep-88	0.48	0.19	8.77	14.37	424,075	19.41
Oct-88	0.52	0.19	11.11	16.60	441,670	20.09
Nov-88	0.84	0.25	15.35	22.34	420,861	20.78
Dec-88	1.06	0.31	17.21	23.86	438,454	20.79
Jan-89	1.60	0.39	16.85	23.32	440,022	21.51
Feb-89	2.05	0.37	20.40	27.58	395,176	22.85
Mar-89	5.25	0.31	24.11	30.38	435,181	23.66
Apr-89	0.51	0.17	11.22	16.61	405,604	23.27
May-89	0.61	0.27	13.53	20.54	416,160	23.76
Jun-89	0.92	0.35	20.43	27.82	406,293	24.38
Jul-89	0.71	0.30	16.35	23.13	417,166	24.23
Aug-89	0.63	0.21	18.16	25.37	426,085	24.30
Sep-89	1.25	0.21	14.28	20.39	415,068	24.07
Oct-89	0.96	0.23	14.60	20.54	437,134	23.66
Nov-89	0.84	0.25	15.79	21.98	417,821	23.18
Dec-89	2.16	0.46	24.22	29.80	429,490	22.71
Jan-90	1.70	0.41	16.77	22.40	442,700	21.89
Feb-90	1.95	0.41	20.41	26.78	396,926	22.04
Mar-90	1.31	0.31	17.41	23.46	444,320	21.63
Apr-90	0.46	0.19	11.03	17.79	433,420	21.28
May-90	0.59	0.23	11.37	19.16	447,371	21.01
Jun-90	0.61	0.29	12.94	19.94	437,395	20.51
Jul-90	0.71	0.29	12.48	18.94	455,057	20.31
Aug-90	0.67	0.29	14.68	21.46	457,886	20.42
Sep-90	0.78	0.25	9.97	15.59	435,638	20.24
Oct-90	0.65	0.23	11.15	17.58	455,047	20.11
Nov-90	0.47	0.22	10.24	15.43	428,781	19.78
Dec-90	2.16	0.54	23.66	29.70	436,352	20.25
Jan-91	2.21	0.38	19.85	26.17	427,264	19.75
Feb-91	1.59	0.34	13.58	18.15	387,120	18.70
Mar-91	0.93	0.24	13.95	19.99	429,314	18.45
Apr-91	0.68	0.25	11.59	16.62	422,196	18.30
May-91	0.61	0.23	11.26	16.50	430,116	17.79
Jun-91	0.41	0.23	9.93	14.72	424,589	16.89
Jul-91	0.49	0.22	10.70	15.51	441,122	16.75
Aug-91	0.50	0.18	11.24	16.73	441,583	16.90
Sep-91	0.52	0.14	7.46	12.10	417,757	17.06
Oct-91	0.81	0.28	10.80	16.61	433,382	17.35
Nov-91	0.92	0.23	11.35	17.28	402,937	16.98
Dec-91	0.71	0.25	15.30	20.04	419,545	16.19
Jan-92	1.48	0.30	12.85	18.61	425,458	15.84
Feb-92	0.80	0.20	11.16	16.57	396,469	15.91
Mar-92	1.28	0.30	13.75	19.10	426,851	16.46
Apr-92	0.52	0.20	8.53	13.40	416,271	16.79
May-92	0.46	0.14	8.11	13.45	425,558	17.25
Jun-92	0.42	0.19	12.12	18.96	425,510	17.96
Jul-92	0.60	0.29	13.50	20.22	440,210	18.63
Aug-92	0.98	0.20	13.91	19.66	442,131	18.89
Sep-92	0.84	0.17	9.75	14.81	422,574	18.91
Oct-92	2.22	0.14	9.94	14.19	435,690	18.82
Nov-92	0.89	0.18	11.87	17.32	409,266	19.07
Dec-92	1.92	0.39	19.69	26.11	426,169	19.42
Jan-93	1.79	0.28	17.06	22.37	422,755	19.43
Feb-93	2.03	0.27	17.52	23.15	383,950	19.86
Mar-93	3.88	0.34	20.69	26.39	432,980	20.08
Apr-93	0.82	0.16	11.48	17.08	420,051	19.09
May-93	0.42	0.13	7.74	12.89	430,185	17.89
Jun-93	0.72	0.25	11.10	16.75	424,599	17.23
Jul-93	0.46	0.16	8.89	13.94	436,269	16.98
Aug-93	0.54	0.16	10.75	15.88	441,745	17.56
Sep-93	0.68	0.18	9.93	15.37	416,357	18.53
Oct-93	0.61	0.16	11.36	16.96	428,476	19.12
Nov-93	1.25	0.16	14.00	18.82	407,900	19.40
Dec-93	1.04	0.19	16.47	21.39	425,234	19.47
Jan-94	4.86	0.40	24.52	29.53	423,861	20.38
Feb-94	4.37	0.37	21.15	26.17	386,954	20.14
Mar-94	1.20	0.20	13.72	17.44	435,516	18.97
Apr-94	0.59	0.20	12.29	16.97	420,995	18.57
May-94	0.38	0.15	8.27	12.37	436,432	17.88
Jun-94	0.63	0.27	13.08	18.23	426,490	17.86
Jul-94	0.86	0.29	15.39	20.55	443,736	18.11
Aug-94	0.54	0.25	11.87	16.25	451,086	17.80
Sep-94	0.41	0.13	8.14	12.05	430,861	17.84
Oct-94	0.49	0.16	10.06	14.07	449,369	18.17
Nov-94	0.62	0.20	14.42	19.25	428,227	18.67
Dec-94	0.97	0.21	17.22	20.75	446,521	18.63
Jan-95	3.07	0.29	21.61	26.17	464,933	19.39
Feb-95	2.38	0.18	17.14	21.09	418,312	19.59
Mar-95	1.59	0.16	16.51	20.70	461,503	20.04
Apr-95	1.32	0.17	14.18	18.70	441,074	20.62
May-95	1.43	0.18	14.42	19.32	448,341	21.02
Jun-95	1.32	0.21	18.30	24.06	439,423	21.10
Jul-95	1.29	0.24	16.25	19.92	449,856	20.86
Aug-95	1.66	0.22	16.66	20.15	457,423	20.98
Sep-95	1.16	0.11	10.96	14.42	429,774	21.29
Oct-95	1.09	0.15	14.06	17.91	448,017	22.13
Nov-95	1.47	0.19	18.52	22.15	427,091	23.18
Dec-95	2.87	0.26	28.38	32.34	441,688	24.05
Jan-96	6.62	0.44	31.51	37.33	447,224	32.75
Feb-96	3.47	0.33	23.56	28.10	420,265	24.19
Mar-96	1.98	0.21	20.16	24.06	449,569	23.84
Apr-96	1.27	0.17	15.52	19.82	436,007	23.69
May-96	1.57	0.22	16.51	21.08	448,923	23.88
Jun-96	1.81	0.28	20.43	25.33	443,311	24.06
Jul-96	2.04	0.26	20.03	24.71	458,376	24.44
Aug-96	1.72	0.25	20.02	25.31	462,294	24.89
Sep-96	1.76	0.21	15.97	21.31	438,352	25.24
Oct-96	1.74	0.25	17.24	22.81	456,577	25.33
Nov-96	2.19	0.24	17.44	22.09	435,088	25.20
Dec-96	2.70	0.32	28.63	33.37	455,997	25.37
Jan-97	3.95	0.32	25.81	31.59	459,123	24.80
Feb-97	2.07	0.20	19.63	24.79	415,656	23.63
Mar-97	1.81	0.21	17.84	21.90	460,986	22.72
Apr-97	1.58	0.19	15.99	20.15	447,294	22.24
May-97	1.13	0.17	13.04	16.84	457,361	21.66
Jun-97	1.51	0.32	18.59	23.86	450,737	21.60
Jul-97	1.69	0.28	17.71	22.50	466,771	21.57
Aug-97	1.48	0.23	17.32	21.44	466,608	21.48
Sep-97	1.43	0.17	11.32	14.97	444,431	21.45
Oct-97	1.64	0.13	14.24	18.45	459,247	21.82
Nov-97	1.55	0.20	16.62	21.78	432,725	22.17
Dec-97	1.82	0.26	21.36	26.46	450,904	22.07
Jan-98	3.07	0.28	20.10	24.95	452,001	22.14
Feb-98	2.54	0.25	19.09	24.61	412,832	22.59
Mar-98	2.14	0.25	19.74	24.15	459,703	23.05
Apr-98	1.57	0.22	16.60	20.88	442,644	23.43
May-98	2.09	0.21	18.27	22.52	449,293	23.83
Jun-98	2.88	0.40	24.53	29.58	446,427	23.87
Jul-98	2.02	0.23	18.30	21.14	462,429	23.12
Aug-98	3.16	0.25	19.38	22.97	465,910	23.13
Sep-98	7.41	0.15	18.56	21.06	443,901	23.25
Oct-98	1.71	0.19	14.72	18.25	457,954	22.65
Nov-98	1.47	0.15	13.62	16.71	436,528	22.29
Dec-98	2.18	0.34	23.11	26.78	455,099	22.78
Jan-99	5.85	0.45	28.05	32.34	453,814	23.50
Feb-99	3.48	0.19	17.86	21.09	417,627	22.99
Mar-99	2.66	0.22	18.63	21.91	466,267	23.49
Apr-99	1.98	0.24	18.95	24.27	450,620	24.57
May-99	2.57	0.25	18.84	23.81	462,054	25.10
Jun-99	2.75	0.35	23.32	29.12	460,467	25.31
Jul-99	3.14	0.35	24.02	28.93	474,047	25.26
Aug-99	2.44	0.23	19.77	23.89	479,549	24.56
Sep-99	3.31	0.17	16.72	20.65	460,251	24.13
Oct-99	2.04	0.13	16.46	19.94	478,294	23.31
Nov-99	1.68	0.16	15.84	18.59	454,950	22.45
Dec-99	1.74	0.19	18.42	22.00	469,944	21.97
Jan-00	5.21	0.28	21.74	26.25	470,477	22.73
Feb-00	3.42	0.24	21.11	25.24	444,499	23.57
Mar-00	2.12	0.21	19.27	23.01	482,944	24.49
Apr-00	2.51	0.22	20.26	24.63	463,263	25.97
May-00	3.45	0.28	21.66	25.75	478,909	27.17
Jun-00	3.95	0.34	28.89	33.66	471,100	28.08
Jul-00	3.21	0.27	25.69	29.69	483,342	28.31
Aug-00	3.05	0.28	25.44	30.04	491,366	28.54
Sep-00	2.24	0.21	17.97	21.90	463,097	28.52
Oct-00	2.13	0.19	19.83	23.93	485,761	28.86
Nov-00	2.35	0.18	22.95	27.38	461,855	29.59
Dec-00	6.00	0.31	33.80	37.59	475,398	30.26
Jan-01	3.78	0.19	21.44	24.77	524,536	22.77
Feb-01	3.66	0.30	22.87	27.34	472,928	23.17
Mar-01	3.38	0.17	21.80	24.85	525,632	23.02
Apr-01	2.23	0.18	17.76	20.80	508,843	22.58
May-01	1.78	0.16	15.49	18.59	524,305	21.96
Jun-01	2.98	0.32	21.29	24.86	514,448	21.55
Jul-01	2.10	0.22	19.00	21.94	532,406	21.07
Aug-01	2.46	0.29	20.21	23.91	538,439	20.77
Sep-01	20.34	0.29	31.63	32.51	485,616	37.79
Oct-01	1.54	0.17	14.82	15.18	439,574	18.86
Nov-01	1.08	0.16	13.46	15.29	417,386	17.97
Dec-01	1.01	0.14	17.70	19.78	429,869	17.14
Jan-02	1.54	0.11	15.16	18.97	400,287	16.88
Feb-02	0.98	0.10	12.30	15.10	366,148	16.92
Mar-02	1.11	0.17	17.61	21.19	410,597	17.97
Apr-02	0.83	0.16	13.53	17.13	401,304	18.40
May-02	0.84	0.13	13.54	17.06	412,269	18.47
Jun-02	1.52	0.23	18.15	21.14	411,875	18.24
Jul-02	1.34	0.24	17.71	20.34	465,572	18.06
Aug-02	1.14	0.18	15.00	17.38	466,764	17.75
Sep-02	0.86	0.12	10.01	12.05	429,996	17.72
Oct-02	1.02	0.11	12.43	15.82	446,583	17.76
Nov-02	0.89	0.11	11.58	14.80	415,004	17.42
Dec-02	1.72	0.22	18.92	21.66	427,103	17.12
Jan-03	1.51	0.15	13.55	16.68	552,083	16.92
Feb-03	4.00	0.24	19.22	23.46	500,184	17.57
Mar-03	1.71	0.17	14.01	17.43	559,248	17.25
Apr-03	1.20	0.12	10.82	13.14	526,874	17.09
May-03	0.81	0.14	11.60	15.04	533,277	17.24
Jun-03	0.78	0.19	14.07	17.62	536,114	17.29
Jul-03	1.40	0.22	16.49	20.30	558,064	18.06
Aug-03	1.64	0.27	16.76	20.97	556,522	18.78
Sep-03	1.46	0.15	11.08	14.36	527,347	19.10
Oct-03	0.92	0.13	10.58	13.61	552,013	19.24
Nov-03	1.40	0.19	15.02	19.79	527,814	19.96
Dec-03	2.10	0.15	19.65	23.95	555,068	20.07
Jan-04	3.02	0.17	20.29	25.13	582,998	20.48
Feb-04	1.71	0.13	17.97	22.50	552,976	20.45
Mar-04	1.27	0.15	15.27	18.71	600,629	20.44
Apr-04	0.77	0.11	13.85	16.95	582,300	21.09
May-04	1.75	0.28	18.23	22.36	593,722	22.07
Jun-04	1.50	0.29	22.58	26.99	587,752	22.27
Jul-04	1.65	0.26	20.88	24.01	613,326	22.09
Aug-04	1.63	0.20	18.65	21.69	622,739	21.98
Sep-04	3.07	0.18	14.14	16.06	584,580	22.13
Oct-04	1.10	0.14	15.58	18.98	609,403	22.40
Nov-04	1.26	0.18	17.83	20.83	583,593	22.71
Dec-04	2.82	0.23	25.49	28.40	605,755	22.82
Jan-05	4.22	0.30	24.80	28.59	594,326	22.83
Feb-05	1.74	0.16	18.83	22.36	544,760	22.06
Mar-05	1.65	0.14	20.17	23.02	616,865	21.77
Apr-05	1.27	0.13	14.06	16.52	593,954	21.37
May-05	0.96	0.14	14.14	16.29	614,330	21.47
Jun-05	1.63	0.23	21.87	24.74	608,447	22.19
Jul-05	2.21	0.32	26.02	28.99	626,964	23.12
Aug-05	2.14	0.29	21.99	24.75	630,027	23.13
Sep-05	2.01	0.14	15.07	17.33	574,106	22.91
Oct-05	1.77	0.12	16.64	18.73	592,505	22.66
Nov-05	0.99	0.16	17.07	19.93	565,773	22.62
Dec-05	1.90	0.19	25.88	29.06	563,001	22.53
Jan-06	1.68	0.24	18.98	21.22	580,996	22.14
Feb-06	2.13	0.25	21.51	24.68	530,993	22.65
Mar-06	1.25	0.17	21.42	23.85	603,197	23.21
Apr-06	1.07	0.18	19.16	21.49	579,898	23.84
May-06	1.17	0.21	19.52	21.74	597,479	24.32
Jun-06	1.69	0.30	24.67	27.19	592477	24.71
Jul-06	1.80	0.32	25.08	27.36	614637	25.36
Aug-06	1.64	0.26	22.66	25.46	622180	26.11
Sep-06	1.71	0.21	19.68	23.90	579622	27.24
Oct-06	1.96	0.21	23.36	28.46	606228	27.69
Nov-06	1.64	0.18	20.16	23.63	580881	27.17
Dec-06	3.11	0.24	27.78	30.34	599175	26.78
Jan-07	2.62	0.20	24.17	27.93	596622	26.91
Feb-07	4.17	0.21	27.11	30.66	542180	27.36
Mar-07	2.75	0.21	25.85	28.58	612931	27.58
Apr-07	1.88	0.19	21.94	25.15	589552	27.76
May-07	1.14	0.24	19.63	23.40	606495	27.88
Jun-07	2.88	0.37	30.14	33.68	603564	28.36
Jul-07	2.26	0.36	29.46	32.94	622449	28.42
Aug-07	1.97	0.35	27.63	30.80	626370	27.93
Sep-07	1.03	0.16	15.64	18.28	575226	26.90
Oct-07	1.15	0.17	19.30	22.93	603939	26.53
Nov-07	1.04	0.15	17.71	20.22	580452	26.34
Dec-07	3.41	0.24	31.47	36.16	590467	26.91
Jan-08	2.79	0.21	24.01	27.62	578889	26.54
Feb-08	3.33	0.28	25.65	29.46	544456	26.48
Mar-08	2.59	0.26	25.77	29.10	593556	26.27
Apr-08	1.70	0.17	18.93	22.30	576157	25.56
May-08	1.04	0.14	18.00	21.41	584081	24.97
Jun-08	1.83	0.38	25.76	29.90	587159	24.49
Jul-08	1.78	0.32	23.47	25.78	606163	23.58
Aug-08	1.67	0.28	20.43	22.39	590823	22.73
Sep-08	1.66	0.12	11.99	13.77	520054	22.18

NOTES: The current value is compared to the value from the same period in the previous year to account for seasonality. Data are available for those carriers that had at least 1% of domestic enplanements in the previous year. The last 25 months of data include only carriers that reported in each of the last 25 months to retain comparability. Earlier data includes all reporting carriers.

A scheduled operation consists of any nonstop segment of a flight. The term "late" is defined as 15 minutes after the scheduled departure or arrival time. A cancelled flight is one that was not operated but was listed in a carrier's computer reservation system within seven calendar days of the scheduled departure. A diverted flight is one that left from the scheduled departure airport but flew to a destination point other than the scheduled destination point.

A trend line has been provided for flights not arriving on-time. The trend has been calculated through a statistical procedure called Structural Modeling, in which the time series under study is decomposed into seasonal, trend and irregular components. For further information on this statistical procedure, see: S.J. Kiipman, et al., Structural Time Series Analyzer, Modeler and Predictor (STAMP), London: Timberlake Consultants Ltd., 2000.

The dramatic changes in the September 2001 data reflect the impact of the terrorist attacks on September 11, 2001, on aviation, including several days in which commercial air operations were suspended.

Certain flights originating at O'Hare airport and operated by American Airlines (181flights in April 2002) and United Airlines (256 flights in April 2002) between April 24, 2002 and May 8, 2002 are not included in the calculations due to the participation of these carriers in a pilot test program for enhanced baggage screening. A list of affected flights is available from BTS.

SOURCE: U.S. Department of Transportation, Research and Innovative Technology Administration, Bureau of Transportation Statistics, Airline Service Quality Performance data as of November 2008.

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Major U.S. Air Carrier On-time Performance

Major U.S. Air Carrier On-time Performance