APM: Analysis: Definitions of Variables

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The following definitions define the fields in the APM reports of Airport Analysis and City Pair Analysis:

  • % Delayed Airport Departures. Number of flights with Wheels Off time delayed 15 minutes or more when compared to schedule or flight plan, expressed as a percent of the total Departures For Metric Computation.
  • % 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.
  • % of Arrivals with EDCT. Percent of arrivals with an EDCT delay.
  • % of Departures with EDCT. Percent of departures with an EDCT delay. See EDCT for EDCT Departure Delay calculations.
  • % 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.
  • % 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 Airborne Time. The difference between Actual Wheels On and Actual Wheels Off, in minutes.
  • Actual Block Time. The difference between Actual Gate In and Actual Gate Out, in minutes.
  • Actual Gate In. The time an aircraft arrived at the gate. This variable is provided by ASQP and ARINC and is estimated for all other flights that do not contain an ASQP or ARINC record. See ASPM: Estimation Techniques.
  • Actual Gate Out. The time an aircraft departed from the gate. This variable is provided by ASQP and ARINC and is estimated for all other flights that do not contain an ASQP or ARINC record. See ASPM: Estimation Techniques.
  • Actual Wheels Off. The time an aircraft takes off. This variable is derived from ASQP and ARINC data, otherwise it is estimated from the DZ message. See ASPM: Estimation Techniques.
  • Actual Wheels On. The actual time an aircraft lands on the runway. This variable is derived from ASQP and ARINC data, otherwise it is estimated from the AZ message. See ASPM: Estimation Techniques.
  • Airborne Delay. Average difference between actual time en route and flight plan estimated time en route (ETE) or scheduled time en route (scheduled gate-to-gate time minus unimpeded taxi times). The default is to exclude flights where the actual time is less than the scheduled of flight plan time. Users can opt to include those flights on the filter tab.
  • Airborne Time Difference. The difference between Actual Airborne Time and Estimated Time Enroute, in minutes. Difference may be positive or negative.
  • Airport Departure Delay Flight Plan. Estimated delay derived from the Actual Wheels Off minus the Flight Plan Gate Out plus the Unimpeded Taxi Out time, in minutes. Negative values contribute to the average if the report includes early flights.
  • Airport Departure Delay Scheduled. The Actual Wheels Off minus the Scheduled Gate Out plus the Unimpeded Taxi Out time, in minutes. Negative values contribute to the average if the report includes early flights.
  • 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 includes early flights (flights that depart before the scheduled or flight plan time).
  • Airport Departure Difference Flight Plan. The difference between Actual Wheels Off and Flight Plan Wheels Off, in minutes. Difference can be positive or negative.
  • Airport Departure Difference Schedule. The difference between Actual Wheels Off and Scheduled Wheels Off, in minutes. Difference may be positive or negative.
  • Airport. The three- or four-letter code identifying the airport.
  • Arrival Airport. Three- or four-letter code identifying the arrival airport.
  • Arrival Date. Date of arrival of selected flight.
  • Arrivals For Metric Computation. Flight arrivals used for calculating metrics in ASPM. Only flight records that meet the following criteria are included: itinerant flights to or from one of the ASPM 77 Airports or operated by one of the ASPM Carriers (currently 21) with actual arrival and departure and flight plan times that are reported or can be estimated from the other flight record data. General aviation and military flights and most VFR traffic is excluded. Arrivals for Metric Computation are aggregated based on the scheduled arrival time if available, otherwise the flight plan arrival time is used.
  • Arrivals with EDCT. Arrivals with an Expect Departure Clearance Time (EDCT) delay. EDCT Arrival Delay is calculated as Actual Wheels On Time minus the EDCT specified Wheels On Time, in minutes.
  • ASQP Reported Carrier Delay. The number of minutes of delay specifically due to the carrier, for flights that arrived 15 minutes or more past the scheduled arrival time.
  • ASQP Reported Late Arrival Delay. The number of minutes of delay specifically due to the late arrival of a previous flight with the same aircraft, for flights that arrived 15 minutes or more past the scheduled arrival time.
  • ASQP Reported NAS Delay. The number of minutes of delay specifically due to the NAS, for flights that arrived 15 minutes or more past the scheduled arrival time.
  • ASQP Reported Security Delay. The number of minutes of delay specifically due to security for flights that arrived 15 minutes or more past the scheduled arrival time.
  • ASQP Reported Weather Delay. The number of minutes of delay specifically due to weather for flights that arrived 15 minutes or more past the scheduled arrival 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 Airport Departure Delay. The Actual Wheels Off minus the Scheduled Gate Out plus the Unimpeded Taxi Out time, in minutes. Negative values contribute to the average if the report includes early flights.
  • 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 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 for All Arrivals. The average Expect Departure Clearance Time (EDCT) arrival delay for all arrivals.
  • Average EDCT for All Departures. The average Expect Departure Clearance Time (EDCT) departure delay for all departures. See EDCT for EDCT Departure Delay calculations.
  • Average EDCT for Arrivals Where EDCT>0. The average Expect Departure Clearance Time (EDCT) Arrival Delay for all arrivals having an EDCT Arrival Delay.
  • Average EDCT for Departures where EDCT>0. The average Expect Departure Clearance Time (EDCT) Departure Delay for departures with an EDCT Departure Delay. See EDCT for EDCT Departure Delay calculations.
  • Average Estimated Time Enroute. The flight plan filed ETE (Estimated Time Enroute) is the planned airborne time, in minutes.
  • Average Gate Arrival Delay. The sum of minutes of Gate Arrival Delay of 1 minute or more, divided by all arrivals. Gate Arrival Delay is the difference between the Actual Gate In Time and the Scheduled or Flight Plan Gate In Time.
  • Average Gate Departure Delay. The sum of minutes of Gate Departure Delay of 1 minute or more, divided by all departures. Gate Departure Delay is the difference between the Actual Gate Out time and Scheduled or Flight Plan Gate Out time, in minutes.
  • Average Minutes of Delay per Delayed Airport Departure. The average delay for flights with a Wheels Off Time delayed 15 minutes or more compared to the schedule or flight plan estimated Wheels Off Time. See ASPM: Estimation Techniques.
  • 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 Delay. The sum of minutes of Taxi In Delay of 1 minute or more, divided by all arrivals. Taxi in Delay equals actual Taxi In Time minus Unimpeded Taxi In Time.
  • 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 Delay. The sum of minutes of Taxi Out Delay of 1 minute or more, divided by all departures. Taxi Out Delay equals Actual Taxi Out Time minus Unimpeded Taxi Out time.
  • 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. The difference between Actual Block Time and Scheduled Block Time, in minutes.
  • Delayed Airport Departures. Number of flights with Wheels Off Time delayed 15 minutes or more compared to the schedule or flight plan estimated Wheels Off Time.
  • 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.
  • Departure Airport. Three- or four-letter code identifying the departure airport.
  • Departures For Metric Computation. Flight departures used for calculating metrics in ASPM. Only flight records that meet the following criteria are included: itinerant flights to or from one of the ASPM 77 Airports or operated by one of the ASPM Carriers (currently 23) with actual arrival and departure and flight plan times that are reported or can be estimated from the other flight record data. General aviation and military flights and most VFR traffic is excluded. Departures for Metric Computation are aggregated based on the scheduled departure time if available, otherwise the flight plan departure time is used.
  • Departures with EDCT. The number of departures with an Expect Departure Clearance Time (EDCT) Delay. EDCT’s instructing aircraft to remain on the ground at the departure airport until a specified time are issued when congestion, weather, or other problems at the arrival airport or en route will impede flights from arriving at the destination airport as originally planned. A flight may be issued an EDCT and not accumulate any EDCT delay if the Flight Plan Wheels Off time is on or after the EDCT Wheels Off time. See EDCT for EDCT Departure Delay calculations.
  • Flight Count. Number of flights between a City Pair. This is also referred to as the Flights for Metric Computation.
  • Flights with EDCT Arriving more than 15 Minutes Late (Count and Percentage). Flights with an Expect Departure Clearance Time (EDCT) that arrive (wheels on) more than 15 minutes after the arrival time from the most recent EDCT message as reported by TFMS. The percentage is computed by dividing the number of arrivals with EDCT arriving more than 15 minutes late by the total number of arrivals with EDCT.
  • Flights with EDCT Arriving more than 5 Minutes Early (Count and Percentage). Arrivals with an Expect Departure Clearance Time (EDCT) that arrive (wheels on) more than 5 minutes before the arrival time from the most recent EDCT message as reported by TFMS.
  • Flights with EDCT Departing more than 15 Minutes Late (Count and Percentage). Departures with EDCT Hold departing more than 15 minutes later than EDCT Wheels Off Time. The percentage is computed by dividing the number of departures with EDCT hold departing more than 15 minutes after EDCT Wheels Off Time by the total number of departures with EDCT hold.
  • Flights with EDCT Departing more than 5 Minutes Early (Count and Percentage). Departures with EDCT Hold departing more than 5 minutes before EDCT Wheels Off Time. The percentage is computed by dividing the number of departures with EDCT leaving more than 5 minutes early by the total number of departures with EDCT.
  • 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.
  • Scheduled Arrivals. Number of arrivals listed in a published schedule. Most cargo carriers do not have a published schedule.
  • Scheduled Departures. Number of departures listed in a published schedule. Most cargo carriers do not have a published schedule.
  • 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.