ASPM City Pair Analysis: Definitions of Variables

The following definitions define the fields in the ASPM reports of City Pair Analysis:

• % Delayed Gate Arrivals. Number of arrivals delayed 15 minutes or more when compared to schedule or flight plan, expressed as a percent of the total Arrivals For Metric Computation.
• % Delayed Gate Departures. Number of departures delayed 15 minutes or more when compared to schedule or flight plan, expressed as a percent of the total Departures For Metric Computation.
• % On-Time Airport Departures. Number of flights that depart within 15 minutes of the Scheduled Wheels Off time. Expressed as a percent of the total number of Departures for Metric Computation.
• % On-Time Gate Arrivals. Number of flights that arrive at the gate less than 15 minutes past the scheduled time, expressed as a percent of the total number of Arrivals for Metric Computation. The last schedule before Wheels Off is used for metric calculations, therefore an EDCT hold may cause a late arrival.
• % On-Time Gate Departures. Number of flights that departed within 15 minutes past Scheduled Gate Out time, expressed as a percent of the total number of Departures for Metric Computation.
• Actual Block Time (Minimum, Maximum, Average, Standard Deviation). The time elapsed from gate-out to gate-in times (minutes).
• Airborne Delay. Amount of delay caused by airborne holding, in minutes.
• Airport Departure Delay. Actual Wheels Off time minus Scheduled or Flight Plan Gate Out time plus the Unimpeded Taxi Out time, in minutes. Negative values contribute to the average if the report has “Include Early Flights” checkbox selected on the filters tab.
• Arrivals with EDCT. Number of arrivals with an Expect Departure Clearance Time (EDCT) delay at the departure airport. EDCT delay is computed by comparing the EDCT Wheels Off Time to the Flight Plan Wheels Off time (the time on the Flight Plan gate out message from ETMS + Unimpeded Taxi Time). A flight may have been issued an EDCT and not accumulated any EDCT delay if the Flight Plan Wheels Off time was after the EDCT Wheels Off time.
• Average Actual Block Time. The time elapsed from average gate-out to average gate-in times (minutes).
• Average Actual Time Enroute. The average actual airborne time between points, in minutes.
• Average Airborne Delay. The difference between Actual Airborne Time and the flight plan Estimated Time Enroute (Filed ETE), in minutes.
• Average Arrival Delay. The average difference between the average Gate In time and the Flight Plan Gate In time for late arrivals of 1 minute or more.
• Average Block Delay. The difference between Actual Gate-To-Gate time and Scheduled Gate-To-Gate, in minutes. Block delays can only have a negative value if the "allow early flights" filter is selected.
• Average EDCT Where EDCT>0. The average Expect Departure Clearance Time (EDCT) delay at the departure airport for arrivals with an EDCT delay.
• Average Estimated Time Enroute. The flight plan filed ETE (Estimated Time Enroute) is the planned airborne time, in minutes.
• Average Minutes of Delay per Delayed Gate Arrival. The average delay for all flights with an actual Gate In Time delayed 15 minutes or more compared to the schedule or flight plan Gate In Time.
• Average Minutes of Delay per Delayed Gate Departure. The average delay for all flights with an actual Gate Out Time delayed 15 minutes or more compared to the schedule or flight plan Gate Out Time.
• Average Optimal Block Time. The sum of the averages of Unimpeded Taxi Out time, Filed Estimated Time Enroute, and Unimpeded Taxi In time.
• Average Scheduled Block Time. The difference between average scheduled gate-in and average gate-out times (minutes).
• Average Taxi In Time. The average difference between Actual Gate In time and Actual Wheels On time, in minutes. Taxi in time is observed for flights for which OOOI data are available, otherwise it is estimated.
• Average Taxi Out Time. The difference between Actual Gate Out time and Actual Wheels Off time, in minutes, divided by the total number of flights. Taxi out time is observed for flights for which OOOI data are available, otherwise it is estimated. See ASPM: Estimation Techniques.
• Block Delay (Minimum, Maximum, Average, Standard Deviation). The difference between Actual Block Time and Scheduled Block Time, in minutes.
• Block Delay. The difference between Actual Block Time and Scheduled Block Time, in minutes.
• Data Type (Comparison, Base, Difference). In the Block Time Comparison report…
• Delayed Gate Arrivals. Number of flights with a Gate In Time delayed 15 minutes or more compared to the schedule or flight plan Gate In Time.
• Delayed Gate Departures. Number of flights delayed 15 minutes or more compared to the schedule or flight plan Gate Out time.
• Flight Count. Number of flights between a city pair. This is also referred to as the Flights for Metric Computation.
• Flight Type. Filter option indicating flight direction. Permitted variables are: Domestic (both arrival and departure are in the US), US to Foreign, Foreign to US, and Foreign (both arrival and departure are in a foreign country).
• Gate Arrival Delay. The difference between the Actual Gate In time and the Scheduled or Flight Plan Gate In time, in minutes.
• Gate Departure Delay. The difference between the Actual Gate Out time and the Scheduled or Flight Plan Gate Out time, in minutes.
• Matching Flight Counts. Total number of flights matching the chosen criteria for the Block Time Comparison report in APM City Pair Analysis.
• Oceanic. A flight that crosses an ocean and generates "TO" messages. Oceanic flights must have values for all fields in the record to be used for metric computation. Incomplete flight records are not used for metric computation, but are included in Efficiency Counts at airports. As a filter option, it indicates enroute IFR or overflights that cross oceanic airspace. (Yes/No).
• Percent On Time. In the Block Time Analysis and Block Time Comparison reports…
• Physical Class. Filter option indicating categories of aircraft engines. Permissible values are: turbine, jet, piston, and helicopter.
• Scheduled Block Time. The difference between scheduled gate-in and gate-out times (minutes).
• Taxi In Delay. Actual Taxi In Time minus Unimpeded Taxi In Time. Negative values are allowed if the report includes early flights.
• Taxi Out Delay. The difference between Actual Taxi Out time and Unimpeded Taxi Out time, in minutes.
• User Class. Filter option indicating the designations assigned by the NAS Data Warehouse based on the equipment reported: Commercial, Freight, Air Taxi, General Aviation, and Military.