AVAILABILITY AND USE OF DOMESTIC FLIGHTS: AIR PASSENGERS
Domestic Air Seat and Passenger Miles (monthly data, not seasonally
adjusted)
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Revenue passenger-miles are a measure of the volume of air passenger
transportation. Unused seat-miles (the difference between available seat-miles
and revenue passenger miles) are used as a measure of airline capacity
utilization. Another measure is the intensity of use of the equipment.
NOTE: A revenue passenger-mile is equal to one paying passenger carried
one mile. Available seat-miles for an individual flight are the number
of seats multiplied by the distance traveled. The data do not include
international flights by U.S. domestic carriers or domestic flights by
foreign carriers.
| Available seat-miles (billions) |
60.14 |
54.72 |
| Available seat-miles percent change from same month previous year |
1.02 |
-9.01 |
| Revenue passenger-miles (billions) |
44.21 |
41.16 |
| Revenue passenger-miles percent change from same month previous year |
0.27 |
-6.91 |
| Unused seat-miles (billions) |
15.93 |
13.57 |
| Unused seat-miles percent change from same month previous year |
3.16 |
-14.84 |
NOTES: The current value is compared to the value from the same period
in the previous year to account for seasonality. The data have been adjusted
to have a standard 30-day month by multiplying the data for each month
by the ratio: 30/(actual days in month).
These indicators are components of the passenger and overall aircraft
load factors displayed in "Aircraft Utilization-Passengers and Freight.
The dramatic changes in the September 2001 data reflect the impact of
the terrorist attacks on Sept. 11, 2001, on aviation, including several
days in which commercial air operations were suspended.
Alaskan carriers that began reporting T100 data in January 2002 are excluded
from this report to retain comparability for comparisons with the previous
year.
SOURCE: U.S. Department of Transportation, Bureau of Transportation Statistics,
Air Carrier Traffic Statistics Monthly, May 2002.
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