Major U.S. Air Carriers On-time Performance
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Major U.S. Air Carriers On-Time Performance (monthly data, not seasonally adjusted)
Flights Not Arriving On-Time (monthly data, not seasonally adjusted)
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.
| Number of scheduled
flights |
552,976 |
544,760 |
| Percent change from same
month previous year |
10.55 |
-1.49 |
| Percent of flights not
arriving on time |
22.50 |
22.36 |
| Change from same month
previous year |
-0.96 |
-0.14 |
| Percent of flights not
departing on time |
17.97 |
18.83 |
| Change from same month
previous year |
-1.25 |
0.86 |
| Percent of cancelled
flights* |
1.71 |
1.74 |
| Change from same month
previous year |
-2.28 |
0.03 |
| Percent of diverted
flights** |
0.13 |
0.16 |
| Change from same month
previous year |
-0.10 |
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 is available from BTS.
SOURCE: U.S. Department of Transportation, Bureau of
Transportation Statistics, Airline Service Quality Performance data, as of
April 2005.
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