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U.S. Department of TransportationU.S. Department of Transportation IconUnited States Department of TransportationUnited States Department of Transportation
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Glossary : D
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Deep Draft VesselA barge, ship, or ferry operating primarily in the open ocean. (Shipping on the Great Lakes and St. Lawrence Seaway is classified with shallow draft vessels.) ( Commodity Flow Survey (CFS) )
Departure DelayThe difference between the scheduled departure time and the actual departure time from the origin airport gate. ( Airline On-Time Performance Data )
Departures PerformedTakeoffs made at an airport. (same as Completed Departures) ( Air Carrier Statistics (Form 41 Traffic)- All Carriers, Air Carrier Statistics (Form 41 Traffic)- U.S. Carriers )
Departures ScheduledTakeoffs scheduled at an airport, as set forth in published schedules. (same as Scheduled Departures) ( Air Carrier Statistics (Form 41 Traffic)- All Carriers, Air Carrier Statistics (Form 41 Traffic)- U.S. Carriers )
DestinationFor travel period trips, the destination is the farthest point of travel from the point of origin of a trip of 75 miles or more one-way. For travel day trips, the destination is the point at which there is a break in travel. ( Nationwide Personal Transportation Survey (NPTS) )
Destination Of TripThe place reported by a respondent as the destination of the trip. If more than one place is visited on the same trip, the place which is the farthest point from the origin is considered the destination of the trip. ( American Travel Survey (ATS) 1995 )
Destination State FIPSThe FIPS code for the destination state. (see FIPS) ( Air Carrier Statistics (Form 41 Traffic)- All Carriers, Air Carrier Statistics (Form 41 Traffic)- U.S. Carriers )
Distance ShippedThe distance between origin and destination for a shipment. For the distance shipped intervals table, the distance is calculated based on the great circle distance between the origin and destination ZIP Code centroids. All other distance-related data (i.e., ton-miles and average miles per shipment) are based on the mileage calculations produced by Oak Ridge National Laboratories. ( Commodity Flow Survey (CFS) )
Diverted FlightA flight that is required to land at a destination other than the original scheduled destination for reasons beyond the control of the pilot/company. ( Airline On-Time Performance Data )
Domestic OperationsAll air carrier operations having destinations within the 50 United States, the District of Columbia, the Commonwealth of Puerto Rico, and the U.S. Virgin Islands. ( Small Air Carrier Statistics (Form 298C Traffic Data), Airline On-Time Performance Data )
DriverA person who operates a motorized vehicle. If more than one person drives on a single trip, the person who drives the most miles is classified as the principal driver. ( Nationwide Personal Transportation Survey (NPTS) )
Duration Of TripNumber of nights spent away from home on a trip and includes nights spent at the destination, nights spent en route and nights spent on side trips. It is possible for a trip not to involve an overnight stay from home; a traveler could take a trip of 100 miles or more and return on the same day. ( American Travel Survey (ATS) 1995 )
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