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TABLE 3-4 Average
Monthly Number of Delays by Cause: July 2003-January 2004
Number, except as noted
Excel | CSV
| Graphic Version
| Air
carrier delay |
28,040 |
27,897 |
17,194 |
19,293 |
21,240 |
30,155 |
32,476 |
25,185 |
| Aircraft
arriving late |
30,588 |
29,814 |
16,764 |
18,177 |
24,978 |
35,104 |
33,466 |
26,984 |
| Security
delay |
324 |
376 |
109 |
259 |
185 |
467 |
424 |
306 |
| National
Airspace System delay |
10,114 |
10,588 |
7,757 |
7,499 |
11,598 |
12,685 |
13,491 |
10,533 |
| Extreme
weather |
5,170 |
5,887 |
2,292 |
1,667 |
3,381 |
4,201 |
7,907 |
4,358 |
| Total |
74,236 |
74,562 |
44,116 |
46,895 |
61,382 |
82,612 |
87,764 |
67,367 |
| Delays
as a percentage of scheduled flights |
13.3 |
13.4 |
8.4 |
8.5 |
11.6 |
14.9 |
15.0 |
U |
KEY: U = data are unavailable
(i.e., not calculated).
NOTES: Air carrier delay is due to circumstances
within the airline's control (e.g., maintenance or crew problems, aircraft
cleaning, baggage loading, and fueling).
Extreme weather is significant meteorological conditions (actual or
forecast) that, in the judgment of the carrier, delays or prevents the
operation of a flight (e.g., tornado, blizzard, or hurricane). National Airspace System are delays and
cancellations attributable to the national aviation system that refer to a
broad set of conditions (e.g., non-extreme weather conditions, airport
operations, heavy traffic volume, and air traffic control). Aircraft ariving late refers to the late
arrival of the previous flight where the same aircraft is used for the
present flight, causing the present flight to depart late. A security delay is a delay or cancellation
caused by evacuation of a terminal or concourse, re-boarding of the aircraft
because of a security breach, inoperative screening equipment, and/or long
lines in excess of 29 minutes at screening areas.
The
airlines required to report in 2003 were: Alaska Airlines, America West
Airlines, American Airlines, American Eagle Airlines, ATA Airline (formerly
doing business as American Trans Air), Atlantic Coast Airlines, Atlantic
Southeast Airlines, Continental Airlines, Continental Express, Delta
Airlines, ExpressJet Airlines, Northwest Airlines, Southwest Airlines,
SkyWest Airlines, United Airlines, and US Airways. JetBlue Airways and Hawaiian Airlines
reported voluntarily.
SOURCE: U.S. Department of
Transportation, Bureau of Transportation Statistics, "Causes of Flight
Delays," available at http://www.bts.gov/oai, as of March 2004.
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