FLIGHT AVAILABILITY AND DISTANCE: DOMESTIC
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Domestic Revenue Aircraft Departures (monthly data, not seasonally adjusted)
Average Domestic Flight Stage Length (monthly data, not seasonally adjusted)
Frequency of aircraft departures, the number of connections required for a
single trip, and the match between available flights and travelers' desired origin
and destination points are all important determinants of scheduling convenience.
Because data on connections are currently not available in a suitable format,
flight stage length is used here to supplement the information on departures.
Flight stage length is the distance between take-off airport and landing airport.
If the mix of origin and destination points are held constant, then an increase
in flight stage length implies fewer connections are required for a trip and,
therefore, higher quality of air passenger services.
The key relation is that departures and flight stage length will tend to move
in opposite directions when changes are due to changes in the number of connections.
For example, a trip from city A to city B with a connection in city C will have
two departures, but generally a shorter average flight stage length, than the
direct flight from A to B with a single departure.
| Revenue aircraft departures (thousands) |
703 |
649 |
| Revenue aircraft departures percent change from same month previous year |
2.93 |
-7.68 |
| Flight stage length (miles) |
691 |
683 |
| Flight stage length percent change from same month previous year |
1.92 |
-1.16 |
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).
The data do not include international flights by U.S. domestic carriers or
domestic flights by foreign carriers.
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, July 2002.
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