Major U.S. Air Carrier On-time Performance

Major U.S. Air Carrier On-time Performance

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Date Cancelled Diverted Depart Late Arrive Late Operations Trend for Arrive Late
Sep-87 0.90 0.20 13.66 22.91 427,570 25.34401
Oct-87 0.67 0.19 11.52 19.61 448,620 24.90109
Nov-87 1.23 0.26 15.45 23.84 422,803 24.90306
Dec-87 2.61 0.43 25.11 33.49 440,403 24.8771
Jan-88 3.61 0.53 23.00 30.65 436,950 24.10555
Feb-88 1.77 0.31 17.88 25.24 412,579 22.75566
Mar-88 0.70 0.24 14.13 21.10 445,080 21.42767
Apr-88 0.56 0.25 11.86 17.33 427,325 20.6234
May-88 0.60 0.25 12.79 18.03 435,916 19.83801
Jun-88 0.28 0.22 10.72 15.62 431,299 18.8415
Jul-88 0.62 0.33 13.47 18.46 441,118 18.82719
Aug-88 0.55 0.28 12.35 17.04 446,769 18.90745
Sep-88 0.48 0.19 8.77 14.37 424,075 19.41714
Oct-88 0.52 0.19 11.11 16.60 441,670 20.11968
Nov-88 0.84 0.25 15.35 22.34 420,861 20.84314
Dec-88 1.06 0.31 17.21 23.86 438,454 20.90313
Jan-89 1.60 0.39 16.85 23.32 440,022 21.60266
Feb-89 2.05 0.37 20.40 27.58 395,176 22.90301
Mar-89 5.25 0.31 24.11 30.38 435,181 23.68552
Apr-89 0.51 0.17 11.22 16.61 405,604 23.26085
May-89 0.61 0.27 13.53 20.54 416,160 23.69227
Jun-89 0.92 0.35 20.43 27.82 406,293 24.23645
Jul-89 0.71 0.30 16.35 23.13 417,166 24.10332
Aug-89 0.63 0.21 18.16 25.37 426,085 24.21222
Sep-89 1.25 0.21 14.28 20.39 415,068 24.01735
Oct-89 0.96 0.23 14.60 20.54 437,134 23.65202
Nov-89 0.84 0.25 15.79 21.98 417,821 23.22277
Dec-89 2.16 0.46 24.22 29.80 429,490 22.785
Jan-90 1.70 0.41 16.77 22.40 442,700 21.98421
Feb-90 1.95 0.41 20.41 26.78 396,926 22.10184
Mar-90 1.31 0.31 17.41 23.46 444,320 21.69438
Apr-90 0.46 0.19 11.03 17.79 433,420 21.2804
May-90 0.59 0.23 11.37 19.16 447,371 20.96682
Jun-90 0.61 0.29 12.94 19.94 437,395 20.42593
Jul-90 0.71 0.29 12.48 18.94 455,057 20.23079
Aug-90 0.67 0.29 14.68 21.46 457,886 20.36026
Sep-90 0.78 0.25 9.97 15.59 435,638 20.20685
Oct-90 0.65 0.23 11.15 17.58 455,047 20.11483
Nov-90 0.47 0.22 10.24 15.43 428,781 19.82963
Dec-90 2.16 0.54 23.66 29.70 436,352 20.29831
Jan-91 2.21 0.38 19.85 26.17 427,264 19.80402
Feb-91 1.59 0.34 13.58 18.15 387,120 18.77578
Mar-91 0.93 0.24 13.95 19.99 429,314 18.51272
Apr-91 0.68 0.25 11.59 16.62 422,196 18.29427
May-91 0.61 0.23 11.26 16.50 430,116 17.75077
Jun-91 0.41 0.23 9.93 14.72 424,589 16.83326
Jul-91 0.49 0.22 10.70 15.51 441,122 16.68276
Aug-91 0.50 0.18 11.24 16.73 441,583 16.84613
Sep-91 0.52 0.14 7.46 12.10 417,757 17.02602
Oct-91 0.81 0.28 10.80 16.61 433,382 17.33473
Nov-91 0.92 0.23 11.35 17.28 402,937 17.00856
Dec-91 0.71 0.25 15.30 20.04 419,545 16.27823
Jan-92 1.48 0.30 12.85 18.61 425,458 15.94577
Feb-92 0.80 0.20 11.16 16.57 396,469 16.00723
Mar-92 1.28 0.30 13.75 19.10 426,851 16.53332
Apr-92 0.52 0.20 8.53 13.40 416,271 16.81789
May-92 0.46 0.14 8.11 13.45 425,558 17.22818
Jun-92 0.42 0.19 12.12 18.96 425,510 17.87232
Jul-92 0.60 0.29 13.50 20.22 440,210 18.52685
Aug-92 0.98 0.20 13.91 19.66 442,131 18.80638
Sep-92 0.84 0.17 9.75 14.81 422,574 18.85929
Oct-92 2.22 0.14 9.94 14.19 435,690 18.81526
Nov-92 0.89 0.18 11.87 17.32 409,266 19.0945
Dec-92 1.92 0.39 19.69 26.11 426,169 19.46656
Jan-93 1.79 0.28 17.06 22.37 422,755 19.49923
Feb-93 2.03 0.27 17.52 23.15 383,950 19.89077
Mar-93 3.88 0.34 20.69 26.39 432,980 20.08712
Apr-93 0.82 0.16 11.48 17.08 420,051 19.08874
May-93 0.42 0.13 7.74 12.89 430,185 17.88938
Jun-93 0.72 0.25 11.10 16.75 424,599 17.21085
Jul-93 0.46 0.16 8.89 13.94 436,269 16.96577
Aug-93 0.54 0.16 10.75 15.88 441,745 17.52893
Sep-93 0.68 0.18 9.93 15.37 416,357 18.48006
Oct-93 0.61 0.16 11.36 16.96 428,476 19.0902
Nov-93 1.25 0.16 14.00 18.82 407,900 19.4036
Dec-93 1.04 0.19 16.47 21.39 425,234 19.50429
Jan-94 4.86 0.40 24.52 29.53 423,861 20.4112
Feb-94 4.37 0.37 21.15 26.17 386,954 20.15524
Mar-94 1.20 0.20 13.72 17.44 435,516 19.02379
Apr-94 0.59 0.20 12.29 16.97 420,995 18.59788
May-94 0.38 0.15 8.27 12.37 436,432 17.89426
Jun-94 0.63 0.27 13.08 18.23 426,490 17.83988
Jul-94 0.86 0.29 15.39 20.55 443,736 18.05991
Aug-94 0.54 0.25 11.87 16.25 451,086 17.75465
Sep-94 0.41 0.13 8.14 12.05 430,861 17.80603
Oct-94 0.49 0.16 10.06 14.07 449,369 18.15195
Nov-94 0.62 0.20 14.42 19.25 428,227 18.67777
Dec-94 0.97 0.21 17.22 20.75 446,521 18.69004
Jan-95 3.07 0.29 21.61 26.17 464,933 19.45495
Feb-95 2.38 0.18 17.14 21.09 418,312 19.6492
Mar-95 1.59 0.16 16.51 20.70 461,503 20.0835
Apr-95 1.32 0.17 14.18 18.70 441,074 20.63636
May-95 1.43 0.18 14.42 19.32 448,341 21.0017
Jun-95 1.32 0.21 18.30 24.06 439,423 21.07526
Jul-95 1.29 0.24 16.25 19.92 449,856 20.84059
Aug-95 1.66 0.22 16.66 20.15 457,423 20.94175
Sep-95 1.16 0.11 10.96 14.42 429,774 21.23847
Oct-95 1.09 0.15 14.06 17.91 448,017 22.07688
Nov-95 1.47 0.19 18.52 22.15 427,091 23.11832
Dec-95 2.87 0.26 28.38 32.34 441,688 23.99459
Jan-96 6.62 0.44 31.51 37.33 447,224 24.07597
Feb-96 3.47 0.33 23.56 28.10 420,265 24.15734
Mar-96 1.98 0.21 20.16 24.06 449,569 23.8499
Apr-96 1.27 0.17 15.52 19.82 436,007 23.72208
May-96 1.57 0.22 16.51 21.08 448,923 23.90219
Jun-96 1.81 0.28 20.43 25.33 443,311 24.07753
Jul-96 2.04 0.26 20.03 24.71 458,376 24.42553
Aug-96 1.72 0.25 20.02 25.31 462,294 24.83425
Sep-96 1.76 0.21 15.97 21.31 438,352 25.14266
Oct-96 1.74 0.25 17.24 22.81 456,577 25.25001
Nov-96 2.19 0.24 17.44 22.09 435,088 25.13453
Dec-96 2.70 0.32 28.63 33.37 455,997 25.33471
Jan-97 3.95 0.32 25.81 31.59 459,123 24.80467
Feb-97 2.07 0.20 19.63 24.79 415,656 23.64403
Mar-97 1.81 0.21 17.84 21.90 460,986 22.7665
Apr-97 1.58 0.19 15.99 20.15 447,294 22.30356
May-97 1.13 0.17 13.04 16.84 457,361 21.72907
Jun-97 1.51 0.32 18.59 23.86 450,737 21.66876
Jul-97 1.69 0.28 17.71 22.50 466,771 21.60362
Aug-97 1.48 0.23 17.32 21.44 466,608 21.47762
Sep-97 1.43 0.17 11.32 14.97 444,431 21.396
Oct-97 1.64 0.13 14.24 18.45 459,247 21.75277
Nov-97 1.55 0.20 16.62 21.78 432,725 22.09868
Dec-97 1.82 0.26 21.36 26.46 450,904 22.06037
Jan-98 3.07 0.28 20.10 24.95 452,001 22.16182
Feb-98 2.54 0.25 19.09 24.61 412,832 22.59197
Mar-98 2.14 0.25 19.74 24.15 459,703 23.07243
Apr-98 1.57 0.22 16.60 20.88 442,644 23.46702
May-98 2.09 0.21 18.27 22.52 449,293 23.8688
Jun-98 2.88 0.40 24.53 29.58 446,427 23.92951
Jul-98 2.02 0.23 18.30 21.14 462,429 23.18123
Aug-98 3.16 0.25 19.38 22.97 465,910 23.12961
Sep-98 7.41 0.15 18.56 21.06 443,901 23.16705
Oct-98 1.71 0.19 14.72 18.25 457,954 22.57956
Nov-98 1.47 0.15 13.62 16.71 436,528 22.23022
Dec-98 2.18 0.34 23.11 26.78 455,099 22.75149
Jan-99 5.85 0.45 28.05 32.34 453,814 23.47526
Feb-99 3.48 0.19 17.86 21.09 417,627 22.99779
Mar-99 2.66 0.22 18.63 21.91 466,267 23.526
Apr-99 1.98 0.24 18.95 24.27 450,620 24.61481
May-99 2.57 0.25 18.84 23.81 462,054 25.16379
Jun-99 2.75 0.35 23.32 29.12 460,467 25.38417
Jul-99 3.14 0.35 24.02 28.93 474,047 25.30226
Aug-99 2.44 0.23 19.77 23.89 479,549 24.55878
Sep-99 3.31 0.17 16.72 20.65 460,251 24.04823
Oct-99 2.04 0.13 16.46 19.94 478,294 23.2246
Nov-99 1.68 0.16 15.84 18.59 454,950 22.38373
Dec-99 1.74 0.19 18.42 22.00 469,944 21.97552
Jan-00 5.21 0.28 21.74 26.25 470,477 22.74049
Feb-00 3.42 0.24 21.11 25.24 444,499 23.57231
Mar-00 2.12 0.21 19.27 23.01 482,944 24.53744
Apr-00 2.51 0.22 20.26 24.63 463,263 26.03109
May-00 3.45 0.28 21.66 25.75 478,909 27.24567
Jun-00 3.95 0.34 28.89 33.66 471,100 28.16998
Jul-00 3.21 0.27 25.69 29.69 483,342 28.38508
Aug-00 3.05 0.28 25.44 30.04 491,366 28.54005
Sep-00 2.24 0.21 17.97 21.90 463,097 28.41686
Oct-00 2.13 0.19 19.83 23.93 485,761 28.73356
Nov-00 2.35 0.18 22.95 27.38 461,855 29.41395
Dec-00 6.00 0.31 33.80 37.59 475,398 30.08627
Jan-01 3.78 0.19 21.44 24.77 524,536 22.75833
Feb-01 3.66 0.30 22.87 27.34 472,928 23.14071
Mar-01 3.38 0.17 21.80 24.85 525,632 23.04481
Apr-01 2.23 0.18 17.76 20.80 508,843 22.65514
May-01 1.78 0.16 15.49 18.59 524,305 22.08841
Jun-01 2.98 0.32 21.29 24.86 514,448 21.72223
Jul-01 2.10 0.22 19.00 21.94 532,406 21.23626
Aug-01 2.46 0.29 20.21 23.91 538,439 20.86776
Sep-01 20.34 0.29 31.63 32.51 485,616 19.85453
Oct-01 1.54 0.17 14.82 15.18 439,574 18.8413
Nov-01 1.08 0.16 13.46 15.29 417,386 17.91861
Dec-01 1.01 0.14 17.70 19.78 429,869 17.13623
Jan-02 1.54 0.11 15.16 18.97 400,287 16.87513
Feb-02 0.98 0.10 12.30 15.10 366,148 16.93429
Mar-02 1.11 0.17 17.61 21.19 410,597 18.00871
Apr-02 0.83 0.16 13.53 17.13 401,304 18.45035
May-02 0.84 0.13 13.54 17.06 412,269 18.56522
Jun-02 1.52 0.23 18.15 21.14 411,875 18.39117
Jul-02 1.34 0.24 17.71 20.34 465,572 18.19688
Aug-02 1.14 0.18 15.00 17.38 466,764 17.79988
Sep-02 0.86 0.12 10.01 12.05 429,996 17.61562
Oct-02 1.02 0.11 12.43 15.82 446,583 17.63072
Nov-02 0.89 0.11 11.58 14.80 415,004 17.28759
Dec-02 1.72 0.22 18.92 21.66 427,103 17.056
Jan-03 1.51 0.15 13.55 16.68 552,083 16.86237
Feb-03 4.00 0.24 19.22 23.46 500,184 17.51826
Mar-03 1.71 0.17 14.01 17.43 559,248 17.29104
Apr-03 1.20 0.12 10.82 13.14 526,874 17.17038
May-03 0.81 0.14 11.60 15.04 533,277 17.3712
Jun-03 0.78 0.19 14.07 17.62 536,114 17.48513
Jul-03 1.40 0.22 16.49 20.30 558,064 18.22913
Aug-03 1.64 0.27 16.76 20.97 556,522 18.81645
Sep-03 1.46 0.15 11.08 14.36 527,347 18.98128
Oct-03 0.92 0.13 10.58 13.61 552,013 19.1127
Nov-03 1.40 0.19 15.02 19.79 527,814 19.80321
Dec-03 2.10 0.15 19.65 23.95 555,068 19.99815
Jan-04 3.02 0.17 20.29 25.13 582,998 20.39341
Feb-04 1.71 0.13 17.97 22.50 552,976 20.40766
Mar-04 1.27 0.15 15.27 18.71 600,629 20.49472
Apr-04 0.77 0.11 13.85 16.95 582,300 21.15203
May-04 1.75 0.28 18.23 22.36 593,722 22.15405
Jun-04 1.50 0.29 22.58 26.99 587,752 22.43327
Jul-04 1.65 0.26 20.88 24.01 613,326 22.26287
Aug-04 1.63 0.20 18.65 21.69 622,739 22.0364
Sep-04 3.07 0.18 14.14 16.06 584,580 21.99963
Oct-04 1.10 0.14 15.58 18.98 609,403 22.25498
Nov-04 1.26 0.18 17.83 20.83 583,593 22.53604
Dec-04 2.82 0.23 25.49 28.40 605,755 22.73346
Jan-05 4.22 0.30 24.80 28.59 594,326 22.7153
Feb-05 1.74 0.16 18.83 22.36 544,760 22.00866
Mar-05 1.65 0.14 20.17 23.02 616,865 21.8133
Apr-05 1.27 0.13 14.06 16.52 593,954 21.44521
May-05 0.96 0.14 14.14 16.29 614,330 21.59706
Jun-05 1.60 0.24 21.81 24.61 596,416 22.36345
Jul-05 2.19 0.32 25.97 28.88 614,501 23.26187
Aug-05 2.12 0.29 22.10 24.82 617,684 23.16423
Sep-05 2.04 0.14 15.20 17.42 564,013 22.76399
Oct-05 1.78 0.12 16.71 18.75 582,691 22.51438
Nov-05 0.99 0.16 17.16 19.98 559,508 22.43476
Dec-05 1.90 0.19 25.86 29.06 565,473 22.44672
Jan-06 1.57 0.23 18.69 20.98 555,864 22.01613
Feb-06 2.10 0.25 21.52 24.79 508,556 22.56391
Mar-06 1.22 0.17 21.39 23.89 579,462 23.18352
Apr-06 1.00 0.17 19.05 21.48 557,139 23.74435
May-06 1.13 0.21 19.45 21.74 574,342 24.17597
Jun-06 1.54 0.31 24.33 26.94 568,733 24.49685
Jul-06 1.63 0.31 23.77 26.07 588,995 24.91744
Aug-06 1.47 0.26 21.51 24.21 557,410 25.43849
Sep-06 1.67 0.21 19.40 23.74 555,431 26.36611
Oct-06 1.82 0.21 22.10 27.11 581,628 26.77785
Nov-06 1.60 0.18 20.06 23.60 557,302 26.36829
Dec-06 2.95 0.23 26.79 29.32 574,993 26.11668
Jan-07 2.53 0.19 23.12 26.88 590,275 26.26031
Feb-07 4.40 0.22 28.75 32.68 537,535 26.95301
Mar-07 2.61 0.20 24.10 26.74 607,893 26.8742
Apr-07 1.76 0.20 21.10 24.36 584,383 26.93666
May-07 1.04 0.23 18.53 22.26 600,259 26.95154
Jun-07 2.58 0.36 28.54 32.10 598,485 27.39876

NOTE: 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. Only carriers that reported for all months in the last two years are included here to retain comparability.

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 July 2007.