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TermsDefinitions
ActivityPersons age 16 and over were asked to classify themselves by their main activity, i.e., working full or part time, a homemaker, in the armed forces, going to school, or retired. ( American Travel Survey (ATS) 1995 )
Actual Arrival TimesGate arrival time is the instance when the pilot sets the aircraft parking brake after arriving at the airport gate or passenger unloading area.  If the parking brake is not set, record the time for the opening of the passenger door.  Also, carriers using a Docking Guidance System (DGS) may record the official gate-arrival time when the aircraft is stopped at the appropriate parking mark. ( Airline On-Time Performance Data )
Actual Departure TimesGate departure time is the instance when the pilot releases the aircraft parking brake after passengers have loaded and aircraft doors have been closed. In cases where the flight returned to the departure gate before wheels-off time and departed a second time, report the last gate departure time before wheels-off time.  In cases of an air return, report the last gate departure time before the gate return.  If passengers were boarded without the parking brake being set, record the time that the passenger door was closed.  Also, carriers using a Docking Guidance System may record the official gate-departure time based on aircraft movement.  For example, one DGS records gate departure time when the aircraft moves more than 1 meter from the appropriate parking mark within 15 seconds.  Fifteen seconds is then subtracted from the recorded time to obtain the appropriate out time. ( Airline On-Time Performance Data )
AirAir service for shipments that typically weigh more than 100 pounds using commercial or private aircraft. Includes air freight and air express. ( Commodity Flow Survey (CFS) )
Air FreightProperty, other than express and passenger baggage transported by air. ( Air Carrier Statistics (Form 41 Traffic)- All Carriers, Small Air Carrier Statistics (Form 298C Traffic Data), Air Carrier Statistics (Form 41 Traffic)- U.S. Carriers )
Air TaxiA classification of air carriers established by 14 CFR 298 which operate small aircraft, and do not hold a certificate of public convenience and necessity. ( Small Air Carrier Statistics (Form 298C Traffic Data) )
Air TimeThe airborne hours of aircraft computed from the moment an aircraft leaves the ground until it touches the ground at the end of a flight stage. ( Air Carrier Statistics (Form 41 Traffic)- All Carriers, Air Carrier Statistics (Form 41 Traffic)- U.S. Carriers )
Air Traffic LiabilitiesThe value of transportation sold but not used or refunded; i.e., (1) liabilities to passengers, or (2) liabilities to others. These include payables to other airlines for portions of interairline passenger trips - amounts the ticketing carrier owes the performing carrier. Also included are amounts the ticketing carrier owes to passengers prior to flights - which remain unearned revenue until air transportation is provided. ( Air Carrier Financial Reports (Form 41 Financial Data) )
Air TripAny trip in which the type of transportation used to cover most of the miles on that trip was either by commercial airplane or a personal or corporate airplane. ( American Travel Survey (ATS) 1995 )
Aircraft And Traffic Servicing ExpensesCompensation of ground personnel, in-flight expenses for handling and protecting all non-passenger traffic including passenger baggage, and other expenses incurred on the ground to (1) protect and control the in-flight movement of the aircraft, (2) schedule and prepare aircraft operational crew for flight assignment, (3) handle and service aircraft while in line operation, and (4) service and handle traffic on the ground after issuance of documents establishing the air carrier's responsibility to provide air transportation. ( Air Carrier Financial Reports (Form 41 Financial Data) )
Aircraft ConfigurationThe type of payload an aircraft was designed to carry: passenger, cargo, or both. ( Air Carrier Statistics (Form 41 Traffic)- All Carriers, Air Carrier Statistics (Form 41 Traffic)- U.S. Carriers )
Aircraft Days AssignedThe number of days that aircraft owned or acquired through rental or lease (but not inter-change) are in the possession of the reporting air carrier and are available for service on the reporting carrier's routes plus the number of days such aircraft are in service on routes of others under interchange agreements. Includes days in overhaul, or temporarily out of service due to schedulecancellations. Excludes days that newly acquired aircraft are on hand but not available or formally withdrawn from air transport service. ( Air Carrier Summary Data (Form 41 and 298C Summary Data) )
Aircraft HoursThe airborne hours of aircraft computed from the moment an aircraft leaves the ground until it touches the ground at the end of a flight stage. ( Small Air Carrier Statistics (Form 298C Traffic Data) )
Aircraft Operating ExpensesExpenses incurred directly in the in-flight operation of aircraft. ( Air Carrier Financial Reports (Form 41 Financial Data) )
Airline IDAn identification number assigned by US DOT to identify a unique airline (carrier). A unique airline (carrier) is defined as one holding and reporting under the same DOT certificate regardless of its Code, Name, or holding company/corporation. Use this field for analysis across a range of years. ( Aviation Support Tables, Airline On-Time Performance Data, Air Carrier Statistics (Form 41 Traffic)- All Carriers, Air Carrier Financial Reports (Form 41 Financial Data), Air Carrier Statistics (Form 41 Traffic)- U.S. Carriers, Air Carrier Summary Data (Form 41 and 298C Summary Data) )
Airport CodeA three character alpha-numeric code issued by the U.S. Department of Transportation which is the official designation of the airport. The airport code is not always unique to a specific airport because airport codes can change or can be reused. ( Aviation Support Tables, Airline Origin and Destination Survey (DB1B), Air Carrier Statistics (Form 41 Traffic)- All Carriers, Small Air Carrier Statistics (Form 298C Traffic Data), Air Carrier Summary Data (Form 41 and 298C Summary Data), Air Carrier Statistics (Form 41 Traffic)- U.S. Carriers, Airline On-Time Performance Data )
Airport IDAn identification number assigned by US DOT to identify a unique airport. Use this field for airport analysis across a range of years because an airport can change its airport code and airport codes can be reused. ( Aviation Support Tables, Airline Origin and Destination Survey (DB1B), Airline On-Time Performance Data, Air Carrier Summary Data (Form 41 and 298C Summary Data), Air Carrier Statistics (Form 41 Traffic)- All Carriers, Air Carrier Statistics (Form 41 Traffic)- U.S. Carriers )
Arrival DelayArrival delay equals the difference of the actual arrival time minus the scheduled arrival time. A flight is considered on-time when it arrives less than 15 minutes after its published arrival time. ( Airline On-Time Performance Data )
AssetsCurrent Assets include cash, accounts receivable, notes receivable. Long-term assets include net carrier operating property. ( Motor Carrier Financial & Operating Information )
Available Seat MilesThe aircraft miles flown in each inter-airport segment multiplied by the number of seats available for revenue passenger use on that segment. ( Small Air Carrier Statistics (Form 298C Traffic Data) )
Average Miles Per ShipmentThe 1993 CFS excluded shipments of STCC 27, Printed Matter, from calculation of average miles per shipment. This was done after determining that respondents in the 1993 CFS shipping newspapers, magazines, catalogs, etc., had used widely varying definitions of the term shipment. In the 1997 CFS, numerous efforts were made during data collection and editing to produce consistent results from establishments shipping SCTG 29, Printed Products. As a result, average miles per shipment for printed products is included in calculations for the 1997 CFS. ( Commodity Flow Survey (CFS) )
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