Major U.S. Air Carriers On-time Performance

Major U.S. Air Carriers On-time Performance

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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 19.70 23.77 491,202
Nov-00 2.34 0.17 22.79 27.18 467,251
Dec-00 5.95 0.31 33.48 37.25 481,038
Jan-01 3.75 0.18 21.28 24.58 529,940
Feb-01 3.65 0.30 22.83 27.27 477,824
Mar-01 3.37 0.17 21.74 24.78 531,119
Apr-01 2.22 0.18 17.69 20.71 514,187
May-01 1.78 0.16 15.45 18.53 529,940
Jun-01 2.98 0.32 21.27 24.82 520,230
Jul-01 2.10 0.22 18.96 21.88 538,440
Aug-01 2.45 0.29 20.14 23.82 544,351
Sep-01 20.24 0.28 31.47 32.34 490,698
Oct-01 1.54 0.17 14.84 15.22 443,796
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 13.93 17.42 438,099
May-02 0.99 0.13 13.83 17.24 449,529
Jun-02 1.71 0.23 18.40 21.36 448,322
Jul-02 1.34 0.24 17.71 20.34 465,573
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 15.82 446,590
Nov-02 0.89 0.11 11.58 14.79 415,024
Dec-02 1.72 0.22 18.92 21.66 427,125
Jan-03 1.51 0.15 13.55 16.68 552,083
Feb-03 4.00 0.24 19.22 23.46 500,184
Mar-03 1.71 0.17 14.01 17.43 559,248
Apr-03 1.20 0.12 10.82 13.14 526,874
May-03 0.81 0.14 11.60 15.04 533,277
Jun-03 0.78 0.19 14.07 17.62 536,114
Jul-03 1.40 0.22 16.49 20.30 558,064
Aug-03 1.64 0.27 16.76 20.97 556,522
Sep-03 1.46 0.15 11.08 14.36 527,347
Oct-03 0.92 0.13 10.58 13.61 552,013
Nov-03 1.40 0.19 15.02 19.79 527,814
Dec-03 2.10 0.15 19.65 23.95 555,068
Jan-04 3.02 0.17 20.29 25.13 582,998
Feb-04 1.71 0.13 17.97 22.50 552,976
Mar-04 1.27 0.15 15.27 18.71 600,629
Apr-04 0.77 0.11 13.85 16.95 582,300
May-04 1.75 0.28 18.23 22.36 593,722
Jun-04 1.50 0.29 22.58 26.99 587,752
Jul-04 1.65 0.26 20.88 24.01 613,326
Aug-04 1.63 0.20 18.65 21.69 622,739
Sep-04 3.07 0.18 14.14 16.06 584,580
Oct-04 1.10 0.14 15.58 18.98 609,403
Nov-04 1.26 0.18 17.83 20.84 583,593

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 Nov-03 Nov-04
Number of scheduled flights 527,814 583,593
Percent change from same month previous year 27.14 10.57
Percent of flights not arriving on time 19.79 20.84
Change from same month previous year 5.00 1.04
Percent of flights not departing on time 15.02 17.83
Change from same month previous year 3.42 2.82
Percent of cancelled flights* 1.40 1.26
Change from same month previous year 0.52 -0.15
Percent of diverted flights** 0.19 0.18
Change from same month previous year 0.07 -0.01

* 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 is available from BTS.

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