Major U.S. Air Carrier On-time Performance

Major U.S. Air Carrier On-time Performance

Major U.S. Air Carrier On-Time Performance and Flights Not Arriving On-Time (monthly data, not seasonally adjusted)

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Date Cancelled (percent) Diverted (percent) Depart late (percent) Arrive late (percent) Number of scheduled flights Trend for arrive late (percent)
Sep-87 0.90 0.20 13.66 22.91 427,570 25.55
Oct-87 0.67 0.19 11.52 19.61 448,620 25.00
Nov-87 1.23 0.26 15.45 23.84 422,803 25.14
Dec-87 2.61 0.43 25.11 33.49 440,403 25.25
Jan-88 3.61 0.53 23.00 30.65 436,950 24.42
Feb-88 1.77 0.31 17.88 25.24 412,579 22.92
Mar-88 0.70 0.24 14.13 21.10 445,080 21.44
Apr-88 0.56 0.25 11.86 17.33 427,325 20.44
May-88 0.60 0.25 12.79 18.03 435,916 19.60
Jun-88 0.28 0.22 10.72 15.62 431,299 18.41
Jul-88 0.62 0.33 13.47 18.46 441,118 18.54
Aug-88 0.55 0.28 12.35 17.04 446,769 18.70
Sep-88 0.48 0.19 8.77 14.37 424,075 19.32
Oct-88 0.52 0.19 11.11 16.60 441,670 20.08
Nov-88 0.84 0.25 15.35 22.34 420,861 20.96
Dec-88 1.06 0.31 17.21 23.86 438,454 21.01
Jan-89 1.60 0.39 16.85 23.32 440,022 21.71
Feb-89 2.05 0.37 20.40 27.58 395,176 23.12
Mar-89 5.25 0.31 24.11 30.38 435,181 23.91
Apr-89 0.51 0.17 11.22 16.61 405,604 23.16
May-89 0.61 0.27 13.53 20.54 416,160 23.60
Jun-89 0.92 0.35 20.43 27.82 406,293 24.13
Jul-89 0.71 0.30 16.35 23.13 417,166 24.05
Aug-89 0.63 0.21 18.16 25.37 426,085 24.25
Sep-89 1.25 0.21 14.28 20.39 415,068 24.09
Oct-89 0.96 0.23 14.60 20.54 437,134 23.71
Nov-89 0.84 0.25 15.79 21.98 417,821 23.34
Dec-89 2.16 0.46 24.22 29.80 429,490 22.96
Jan-90 1.70 0.41 16.77 22.40 442,700 22.05
Feb-90 1.95 0.41 20.41 26.78 396,926 22.23
Mar-90 1.31 0.31 17.41 23.46 444,320 21.77
Apr-90 0.46 0.19 11.03 17.79 433,420 21.18
May-90 0.59 0.23 11.37 19.16 447,371 20.84
Jun-90 0.61 0.29 12.94 19.94 437,395 20.18
Jul-90 0.71 0.29 12.48 18.94 455,057 20.08
Aug-90 0.67 0.29 14.68 21.46 457,886 20.33
Sep-90 0.78 0.25 9.97 15.59 435,638 20.21
Oct-90 0.65 0.23 11.15 17.58 455,047 20.13
Nov-90 0.47 0.22 10.24 15.43 428,781 19.89
Dec-90 2.16 0.54 23.66 29.70 436,352 20.56
Jan-91 2.21 0.38 19.85 26.17 427,264 20.01
Feb-91 1.59 0.34 13.58 18.15 387,120 18.83
Mar-91 0.93 0.24 13.95 19.99 429,314 18.56
Apr-91 0.68 0.25 11.59 16.62 422,196 18.24
May-91 0.61 0.23 11.26 16.50 430,116 17.64
Jun-91 0.41 0.23 9.93 14.72 424,589 16.56
Jul-91 0.49 0.22 10.70 15.51 441,122 16.51
Aug-91 0.50 0.18 11.24 16.73 441,583 16.78
Sep-91 0.52 0.14 7.46 12.10 417,757 17.02
Oct-91 0.81 0.28 10.80 16.61 433,382 17.40
Nov-91 0.92 0.23 11.35 17.28 402,937 17.10
Dec-91 0.71 0.25 15.30 20.04 419,545 16.33
Jan-92 1.48 0.30 12.85 18.61 425,458 15.95
Feb-92 0.80 0.20 11.16 16.57 396,469 15.98
Mar-92 1.28 0.30 13.75 19.10 426,851 16.53
Apr-92 0.52 0.20 8.53 13.40 416,271 16.70
May-92 0.46 0.14 8.11 13.45 425,558 17.10
Jun-92 0.42 0.19 12.12 18.96 425,510 17.76
Jul-92 0.60 0.29 13.50 20.22 440,210 18.54
Aug-92 0.98 0.20 13.91 19.66 442,131 18.84
Sep-92 0.84 0.17 9.75 14.81 422,574 18.87
Oct-92 2.22 0.14 9.94 14.19 435,690 18.78
Nov-92 0.89 0.18 11.87 17.32 409,266 19.14
Dec-92 1.92 0.39 19.69 26.11 426,169 19.61
Jan-93 1.79 0.28 17.06 22.37 422,755 19.65
Feb-93 2.03 0.27 17.52 23.15 383,950 20.08
Mar-93 3.88 0.34 20.69 26.39 432,980 20.30
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 17.72
Jun-93 0.72 0.25 11.10 16.75 424,599 16.97
Jul-93 0.46 0.16 8.89 13.94 436,269 16.76
Aug-93 0.54 0.16 10.75 15.88 441,745 17.39
Sep-93 0.68 0.18 9.93 15.37 416,357 18.45
Oct-93 0.61 0.16 11.36 16.96 428,476 19.10
Nov-93 1.25 0.16 14.00 18.82 407,900 19.46
Dec-93 1.04 0.19 16.47 21.39 425,234 19.60
Jan-94 4.86 0.40 24.52 29.53 423,861 20.70
Feb-94 4.37 0.37 21.15 26.17 386,954 20.37
Mar-94 1.20 0.20 13.72 17.44 435,516 19.03
Apr-94 0.59 0.20 12.29 16.97 420,995 18.53
May-94 0.38 0.15 8.27 12.37 436,432 17.75
Jun-94 0.63 0.27 13.08 18.23 426,490 17.74
Jul-94 0.86 0.29 15.39 20.55 443,736 18.07
Aug-94 0.54 0.25 11.87 16.25 451,086 17.68
Sep-94 0.41 0.13 8.14 12.05 430,861 17.69
Oct-94 0.49 0.16 10.06 14.07 449,369 18.04
Nov-94 0.62 0.20 14.42 19.25 428,227 18.65
Dec-94 0.97 0.21 17.22 20.75 446,521 18.66
Jan-95 3.07 0.29 21.61 26.17 464,933 19.55
Feb-95 2.38 0.18 17.14 21.09 418,312 19.66
Mar-95 1.59 0.16 16.51 20.70 461,503 20.06
Apr-95 1.32 0.17 14.18 18.70 441,074 20.64
May-95 1.43 0.18 14.42 19.32 448,341 21.05
Jun-95 1.32 0.21 18.30 24.06 439,423 21.15
Jul-95 1.29 0.24 16.25 19.92 449,856 20.87
Aug-95 1.66 0.22 16.66 20.15 457,423 20.89
Sep-95 1.16 0.11 10.96 14.42 429,774 21.09
Oct-95 1.09 0.15 14.06 17.91 448,017 21.95
Nov-95 1.47 0.19 18.52 22.15 427,091 23.09
Dec-95 2.87 0.26 28.38 32.34 441,688 24.09
Jan-96 6.62 0.44 31.51 37.33 447,224 24.13
Feb-96 3.47 0.33 23.56 28.10 420,265 24.18
Mar-96 1.98 0.21 20.16 24.06 449,569 23.76
Apr-96 1.27 0.17 15.52 19.82 436,007 23.64
May-96 1.57 0.22 16.51 21.08 448,923 23.89
Jun-96 1.81 0.28 20.43 25.33 443,311 24.16
Jul-96 2.04 0.26 20.03 24.71 458,376 24.57
Aug-96 1.72 0.25 20.02 25.31 462,294 24.94
Sep-96 1.76 0.21 15.97 21.31 438,352 25.18
Oct-96 1.74 0.25 17.24 22.81 456,577 25.23
Nov-96 2.19 0.24 17.44 22.09 435,088 25.09
Dec-96 2.70 0.32 28.63 33.37 455,997 25.43
Jan-97 3.95 0.32 25.81 31.59 459,123 24.90
Feb-97 2.07 0.20 19.63 24.79 415,656 23.58
Mar-97 1.81 0.21 17.84 21.90 460,986 22.61
Apr-97 1.58 0.19 15.99 20.15 447,294 22.22
May-97 1.13 0.17 13.04 16.84 457,361 21.70
Jun-97 1.51 0.32 18.59 23.86 450,737 21.80
Jul-97 1.69 0.28 17.71 22.50 466,771 21.77
Aug-97 1.48 0.23 17.32 21.44 466,608 21.53
Sep-97 1.43 0.17 11.32 14.97 444,431 21.30
Oct-97 1.64 0.13 14.24 18.45 459,247 21.61
Nov-97 1.55 0.20 16.62 21.78 432,725 21.95
Dec-97 1.82 0.26 21.36 26.46 450,904 21.92
Jan-98 3.07 0.28 20.10 24.95 452,001 22.03
Feb-98 2.54 0.25 19.09 24.61 412,832 22.47
Mar-98 2.14 0.25 19.74 24.15 459,703 22.98
Apr-98 1.57 0.22 16.60 20.88 442,644 23.52
May-98 2.09 0.21 18.27 22.52 449,293 24.09
Jun-98 2.88 0.40 24.53 29.58 446,427 24.31
Jul-98 2.02 0.23 18.30 21.14 462,429 23.45
Aug-98 3.16 0.25 19.38 22.97 465,910 23.28
Sep-98 7.41 0.15 18.56 21.06 443,901 23.18
Oct-98 1.71 0.19 14.72 18.25 457,954 22.38
Nov-98 1.47 0.15 13.62 16.71 436,528 21.89
Dec-98 2.18 0.34 23.11 26.78 455,099 22.51
Jan-99 5.85 0.45 28.05 32.34 453,814 23.36
Feb-99 3.48 0.19 17.86 21.09 417,627 22.75
Mar-99 2.66 0.22 18.63 21.91 466,267 23.32
Apr-99 1.98 0.24 18.95 24.27 450,620 24.70
May-99 2.57 0.25 18.84 23.81 462,054 25.45
Jun-99 2.75 0.35 23.32 29.12 460,467 25.86
Jul-99 3.14 0.35 24.02 28.93 474,047 25.80
Aug-99 2.44 0.23 19.77 23.89 479,549 24.81
Sep-99 3.31 0.17 16.72 20.65 460,251 24.07
Oct-99 2.04 0.13 16.46 19.94 478,294 23.02
Nov-99 1.68 0.16 15.84 18.59 454,950 21.96
Dec-99 1.74 0.19 18.42 22.00 469,944 21.48
Jan-00 5.21 0.28 21.74 26.25 470,477 22.35
Feb-00 3.42 0.24 21.11 25.24 444,499 23.24
Mar-00 2.12 0.21 19.27 23.01 482,944 24.25
Apr-00 2.51 0.22 20.26 24.63 463,263 26.01
May-00 3.45 0.28 21.66 25.75 478,909 27.43
Jun-00 3.95 0.34 28.89 33.66 471,100 28.52
Jul-00 3.21 0.27 25.69 29.69 483,342 28.57
Aug-00 3.05 0.28 25.44 30.04 491,366 28.30
Sep-00 2.24 0.21 17.97 21.90 463,097 27.49
Oct-00 2.13 0.19 19.83 23.93 485,761 27.01
Nov-00 2.35 0.18 22.95 27.38 461,855 26.52
Dec-00 6.00 0.31 33.80 37.59 475,398 25.36
Jan-01 3.78 0.19 21.44 24.77 524,536 24.20
Feb-01 3.66 0.30 22.87 27.34 472,928 24.06
Mar-01 3.38 0.17 21.80 24.85 525,632 23.66
Apr-01 2.23 0.18 17.76 20.80 508,843 23.28
May-01 1.78 0.16 15.49 18.59 524,305 22.88
Jun-01 2.98 0.32 21.29 24.86 514,448 22.93
Jul-01 2.10 0.22 19.00 21.94 532,406 22.89
Aug-01 2.46 0.29 20.21 23.91 538,439 23.15
Sep-01 20.34 0.29 31.63 32.51 485,616 23.15
Oct-01 1.54 0.17 14.82 15.18 439,574 16.96
Nov-01 1.08 0.16 13.46 15.29 417,386 16.57
Dec-01 1.01 0.14 17.70 19.78 429,869 16.15
Jan-02 1.67 0.11 15.28 18.98 436,336 16.14
Feb-02 1.08 0.10 12.53 15.31 399,535 16.49
Mar-02 1.35 0.17 17.89 21.41 447,896 17.88
Apr-02 1.03 0.16 13.93 17.42 438,099 18.62
May-02 0.99 0.13 13.83 17.24 449,529 18.95
Jun-02 1.71 0.23 18.40 21.36 448,322 18.97
Jul-02 1.34 0.24 17.71 20.34 465,573 18.75
Aug-02 1.14 0.18 15.00 17.38 466,764 18.09
Sep-02 0.86 0.12 10.01 12.05 429,996 17.60
Oct-02 1.02 0.11 12.43 15.82 446,590 17.43
Nov-02 0.89 0.11 11.58 14.79 415,024 16.82
Dec-02 1.72 0.22 18.92 21.66 427,125 16.40
Jan-03 1.25 0.13 12.24 15.14 423,267 15.91
Feb-03 3.97 0.26 19.19 23.41 503,391 16.84
Mar-03 1.69 0.16 13.99 17.39 559,342 16.52
Apr-03 1.16 0.13 10.80 13.12 527,083 16.32

The number of flights not departing or arriving on time, cancellations, and diversions are measures of service quality. These indicators are strongly seasonal and are affected by weather and heavy demand in winter and summer months, respectively.

On-Time Performance Apr-02 Apr-03
Number of scheduled flights 438,099 527,083
Percent change from same month previous year -13.90 20.31
Percent of flights not arriving on time 17.42 13.12
Change from same month previous year -3.38 -4.30
Percent of flights not departing on time 13.93 10.80
Change from same month previous year -3.83 -3.14
Percent of cancelled flights* 1.03 1.16
Change from same month previous year -1.20 0.13
Percent of diverted flights** 0.16 0.13
Change from same month previous year -0.02 -0.04

* Also counted in flights not arriving or departing on time.

** Also counted in flights not arriving on time.

NOTE: The counted value is compared to the value from the same period in the previous year to account for seasonality. Data for American Eagle was included starting in January 2000. Percent changes from January 1999 to January 2000 were calculated based on data excluding American Eagle. Aloha Airlines, which reported on-time statistics for October 2000 through November 2001, has been excluded to retain comparability.

The data cover the 10 largest U.S. air 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 that the scheduled destination point.

A trendline 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 Analyser, Modeller 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 origination at O'Hare airport and operated by American Airlines (181flights in April) and United Airlines (256 flights in April) 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, Bureau of Transportation Statistics, Airline Service Quality Performance data.