Major U.S. Air Carriers On-time Performance

Major U.S. Air Carriers 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 Diverted Depart Late Arrive Late Operations
Sep-87 0.90 0.20 13.66 22.91 427,570
Oct-87 0.67 0.19 11.52 19.61 448,620
Nov-87 1.23 0.26 15.45 23.84 422,803
Dec-87 2.61 0.43 25.11 33.49 440,403
Jan-88 3.61 0.53 23.00 30.65 436,950
Feb-88 1.77 0.31 17.88 25.24 412,579
Mar-88 0.70 0.24 14.13 21.10 445,080
Apr-88 0.56 0.25 11.86 17.33 427,325
May-88 0.60 0.25 12.79 18.03 435,916
Jun-88 0.28 0.22 10.72 15.62 431,299
Jul-88 0.62 0.33 13.47 18.46 441,118
Aug-88 0.55 0.28 12.35 17.04 446,769
Sep-88 0.48 0.19 8.77 14.37 424,075
Oct-88 0.52 0.19 11.11 16.60 441,670
Nov-88 0.84 0.25 15.35 22.34 420,861
Dec-88 1.06 0.31 17.21 23.86 438,454
Jan-89 1.60 0.39 16.85 23.32 440,022
Feb-89 2.05 0.37 20.40 27.58 395,176
Mar-89 5.25 0.31 24.11 30.38 435,181
Apr-89 0.51 0.17 11.22 16.61 405,604
May-89 0.61 0.27 13.53 20.54 416,160
Jun-89 0.92 0.35 20.43 27.82 406,293
Jul-89 0.71 0.30 16.35 23.13 417,166
Aug-89 0.63 0.21 18.16 25.37 426,085
Sep-89 1.25 0.21 14.28 20.39 415,068
Oct-89 0.96 0.23 14.60 20.54 437,134
Nov-89 0.84 0.25 15.79 21.98 417,821
Dec-89 2.16 0.46 24.22 29.80 429,490
Jan-90 1.70 0.41 16.77 22.40 442,700
Feb-90 1.95 0.41 20.41 26.78 396,926
Mar-90 1.31 0.31 17.41 23.46 444,320
Apr-90 0.46 0.19 11.03 17.79 433,420
May-90 0.59 0.23 11.37 19.16 447,371
Jun-90 0.61 0.29 12.94 19.94 437,395
Jul-90 0.71 0.29 12.48 18.94 455,057
Aug-90 0.67 0.29 14.68 21.46 457,886
Sep-90 0.78 0.25 9.97 15.59 435,638
Oct-90 0.65 0.23 11.15 17.58 455,047
Nov-90 0.47 0.22 10.24 15.43 428,781
Dec-90 2.16 0.54 23.66 29.70 436,352
Jan-91 2.21 0.38 19.85 26.17 427,264
Feb-91 1.59 0.34 13.58 18.15 387,120
Mar-91 0.93 0.24 13.95 19.99 429,314
Apr-91 0.68 0.25 11.59 16.62 422,196
May-91 0.61 0.23 11.26 16.50 430,116
Jun-91 0.41 0.23 9.93 14.72 424,589
Jul-91 0.49 0.22 10.70 15.51 441,122
Aug-91 0.50 0.18 11.24 16.73 441,583
Sep-91 0.52 0.14 7.46 12.10 417,757
Oct-91 0.81 0.28 10.80 16.61 433,382
Nov-91 0.92 0.23 11.35 17.28 402,937
Dec-91 0.71 0.25 15.30 20.04 419,545
Jan-92 1.48 0.30 12.85 18.61 425,458
Feb-92 0.80 0.20 11.16 16.57 396,469
Mar-92 1.28 0.30 13.75 19.10 426,851
Apr-92 0.52 0.20 8.53 13.40 416,271
May-92 0.46 0.14 8.11 13.45 425,558
Jun-92 0.42 0.19 12.12 18.96 425,510
Jul-92 0.60 0.29 13.50 20.22 440,210
Aug-92 0.98 0.20 13.91 19.66 442,131
Sep-92 0.84 0.17 9.75 14.81 422,574
Oct-92 2.22 0.14 9.94 14.19 435,690
Nov-92 0.89 0.18 11.87 17.32 409,266
Dec-92 1.92 0.39 19.69 26.11 426,169
Jan-93 1.79 0.28 17.06 22.37 422,755
Feb-93 2.03 0.27 17.52 23.15 383,950
Mar-93 3.88 0.34 20.69 26.39 432,980
Apr-93 0.82 0.16 11.48 17.08 420,051
May-93 0.42 0.13 7.74 12.89 430,185
Jun-93 0.72 0.25 11.10 16.75 424,599
Jul-93 0.46 0.16 8.89 13.94 436,269
Aug-93 0.54 0.16 10.75 15.88 441,745
Sep-93 0.68 0.18 9.93 15.37 416,357
Oct-93 0.61 0.16 11.36 16.96 428,476
Nov-93 1.25 0.16 14.00 18.82 407,900
Dec-93 1.04 0.19 16.47 21.39 425,234
Jan-94 4.86 0.40 24.52 29.53 423,861
Feb-94 4.37 0.37 21.15 26.17 386,954
Mar-94 1.20 0.20 13.72 17.44 435,516
Apr-94 0.59 0.20 12.29 16.97 420,995
May-94 0.38 0.15 8.27 12.37 436,432
Jun-94 0.63 0.27 13.08 18.23 426,490
Jul-94 0.86 0.29 15.39 20.55 443,736
Aug-94 0.54 0.25 11.87 16.25 451,086
Sep-94 0.41 0.13 8.14 12.05 430,861
Oct-94 0.49 0.16 10.06 14.07 449,369
Nov-94 0.62 0.20 14.42 19.25 428,227
Dec-94 0.97 0.21 17.22 20.75 446,521
Jan-95 3.07 0.29 21.61 26.17 464,933
Feb-95 2.38 0.18 17.14 21.09 418,312
Mar-95 1.59 0.16 16.51 20.70 461,503
Apr-95 1.32 0.17 14.18 18.70 441,074
May-95 1.43 0.18 14.42 19.32 448,341
Jun-95 1.32 0.21 18.30 24.06 439,423
Jul-95 1.29 0.24 16.25 19.92 449,856
Aug-95 1.66 0.22 16.66 20.15 457,423
Sep-95 1.16 0.11 10.96 14.42 429,774
Oct-95 1.09 0.15 14.06 17.91 448,017
Nov-95 1.47 0.19 18.52 22.15 427,091
Dec-95 2.87 0.26 28.38 32.34 441,688
Jan-96 6.62 0.44 31.51 37.33 447,224
Feb-96 3.47 0.33 23.56 28.10 420,265
Mar-96 1.98 0.21 20.16 24.06 449,569
Apr-96 1.27 0.17 15.52 19.82 436,007
May-96 1.57 0.22 16.51 21.08 448,923
Jun-96 1.81 0.28 20.43 25.33 443,311
Jul-96 2.04 0.26 20.03 24.71 458,376
Aug-96 1.72 0.25 20.02 25.31 462,294
Sep-96 1.76 0.21 15.97 21.31 438,352
Oct-96 1.74 0.25 17.24 22.81 456,577
Nov-96 2.19 0.24 17.44 22.09 435,088
Dec-96 2.70 0.32 28.63 33.37 455,997
Jan-97 3.95 0.32 25.81 31.59 459,123
Feb-97 2.07 0.20 19.63 24.79 415,656
Mar-97 1.81 0.21 17.84 21.90 460,986
Apr-97 1.58 0.19 15.99 20.15 447,294
May-97 1.13 0.17 13.04 16.84 457,361
Jun-97 1.51 0.32 18.59 23.86 450,737
Jul-97 1.69 0.28 17.71 22.50 466,771
Aug-97 1.48 0.23 17.32 21.44 466,608
Sep-97 1.43 0.17 11.32 14.97 444,431
Oct-97 1.64 0.13 14.24 18.45 459,247
Nov-97 1.55 0.20 16.62 21.78 432,725
Dec-97 1.82 0.26 21.36 26.46 450,904
Jan-98 3.07 0.28 20.10 24.95 452,001
Feb-98 2.54 0.25 19.09 24.61 412,832
Mar-98 2.14 0.25 19.74 24.15 459,703
Apr-98 1.57 0.22 16.60 20.88 442,644
May-98 2.09 0.21 18.27 22.52 449,293
Jun-98 2.88 0.40 24.53 29.58 446,427
Jul-98 2.02 0.23 18.30 21.14 462,429
Aug-98 3.16 0.25 19.38 22.97 465,910
Sep-98 7.41 0.15 18.56 21.06 443,901
Oct-98 1.71 0.19 14.72 18.25 457,954
Nov-98 1.47 0.15 13.62 16.71 436,528
Dec-98 2.18 0.34 23.11 26.78 455,099
Jan-99 5.85 0.45 28.05 32.34 453,814
Feb-99 3.48 0.19 17.86 21.09 417,627
Mar-99 2.66 0.22 18.63 21.91 466,267
Apr-99 1.98 0.24 18.95 24.27 450,620
May-99 2.57 0.25 18.84 23.81 462,054
Jun-99 2.75 0.35 23.32 29.12 460,467
Jul-99 3.14 0.35 24.02 28.93 474,047
Aug-99 2.44 0.23 19.77 23.89 479,549
Sep-99 3.31 0.17 16.72 20.65 460,251
Oct-99 2.04 0.13 16.46 19.94 478,294
Nov-99 1.68 0.16 15.84 18.59 454,950
Dec-99 1.74 0.19 18.42 22.00 469,944
Jan-00 5.21 0.28 21.74 26.25 470,477
Feb-00 3.42 0.24 21.11 25.24 444,499
Mar-00 2.12 0.21 19.27 23.01 482,944
Apr-00 2.51 0.22 20.26 24.63 463,263
May-00 3.45 0.28 21.66 25.75 478,909
Jun-00 3.95 0.34 28.89 33.66 471,100
Jul-00 3.21 0.27 25.69 29.69 483,342
Aug-00 3.05 0.28 25.44 30.04 491,366
Sep-00 2.24 0.21 17.97 21.90 463,097
Oct-00 2.13 0.19 19.83 23.93 485,761
Nov-00 2.35 0.18 22.95 27.38 461,855
Dec-00 6.00 0.31 33.80 37.59 475,398
Jan-01 3.78 0.19 21.44 24.77 524,536
Feb-01 3.66 0.30 22.87 27.34 472,928
Mar-01 3.38 0.17 21.80 24.85 525,632
Apr-01 2.23 0.18 17.76 20.80 508,843
May-01 1.78 0.16 15.49 18.59 524,305
Jun-01 2.98 0.32 21.29 24.86 514,448
Jul-01 2.10 0.22 19.00 21.94 532,406
Aug-01 2.46 0.29 20.21 23.91 538,439
Sep-01 20.34 0.29 31.63 32.51 485,616
Oct-01 1.54 0.17 14.82 15.18 439,574
Nov-01 1.08 0.16 13.46 15.29 417,386
Dec-01 1.01 0.14 17.70 19.78 429,869
Jan-02 1.67 0.11 15.28 18.98 436,336
Feb-02 1.08 0.10 12.53 15.31 399,535
Mar-02 1.35 0.17 17.89 21.41 447,896
Apr-02 1.03 0.16 13.92 17.39 438,099
May-02 0.99 0.13 13.81 17.22 450,042
Jun-02 1.71 0.23 18.40 21.36 448,322
Jul-02 1.34 0.24 17.71 20.34 465,572
Aug-02 1.14 0.18 15.00 17.38 466,764
Sep-02 0.86 0.12 10.01 12.05 429,996
Oct-02 1.02 0.11 12.43 15.82 446,583
Nov-02 0.89 0.11 11.58 14.80 415,004
Dec-02 1.72 0.22 18.92 21.66 427,103
Jan-03 1.25 0.13 12.24 15.14 423,246
Feb-03 3.67 0.21 18.08 22.09 382,250
Mar-03 1.44 0.16 12.75 16.09 426,448
Apr-03 1.10 0.12 10.11 12.47 400,117
May-03 0.63 0.14 10.70 14.26 404,583
Jun-03 0.70 0.19 13.86 17.50 406,601
Jul-03 1.23 0.22 16.33 20.06 423,724
Aug-03 1.53 0.27 16.55 20.75 422,816
Sep-03 1.41 0.15 10.71 14.16 397,690
Oct-03 0.85 0.13 10.23 13.47 415,857
Nov-03 1.28 0.17 14.86 19.98 392,762
Dec-03 1.82 0.15 18.94 23.47 413,261
Jan-04 2.84 0.17 19.62 24.86 412,151
Feb-04 1.53 0.13 17.38 22.24 390,434
Mar-04 1.18 0.14 15.48 19.42 424,374

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 Mar-03 Mar-04
Number of scheduled flights 426,448 424,374
Percent change from same month previous year -4.79 -0.49
Percent of flights not arriving on time 16.09 19.42
Change from same month previous year -5.32 3.33
Percent of flights not departing on time 12.75 15.48
Change from same month previous year -5.14 2.74
Percent of cancelled flights* 1.44 1.18
Change from same month previous year 0.09 -0.26
Percent of diverted flights** 0.16 0.14
Change from same month previous year -0.01 -0.02

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

** Also counted in flights not arriving on time.

NOTES: The current 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. Hawaiian Airlines started voluntary reporting the data in November 2003, also has been excluded.

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 than the scheduled destination point.

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 (181 flights 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 affected is available from BTS.

SOURCE: U.S. Department of Transportation, Bureau of Transportation Statistics, Airline Service Quality Performance data.