ASPM Baselines: Definitions of Variables

The following definitions define the fields in ASPM Baselines:

• 100 to 40. Actual Time 100 to 40. The amount of time elapsed between the time the aircraft crossed the 100-mile and the 40-mile circle (in minutes).
• 40 to On. Actual Time 40 to Wheels On. The amount of time elapsed between the time the aircraft crossed the 40-mile circle and wheels on (in minutes).
• Airborne Holding Counts. The number of airborne holds that experience a delay of 5 minutes or more (individual flight entry reported by PDARS through OPSNET).
• Airborne Holding Minutes. The total number of minutes of holding for flights subjected to airborne holding. Source: PDARS through OPSNET
• Arrival Cancellations. The number of canceled arrivals based on Scheduled flights and Active Flight Plans.
• Arrival Completion Rate. The percentage of scheduled and/or planned arrivals that were not canceled.
• Arrival Completion Rate II. The percent of expected flights that arrived. Formula: Metric Flights / (Metric Flights + Cancellations).
• Average Taxi In. The difference between Actual Wheels on time and Actual Gate in time, in minutes.
• Average Taxi Out. The difference between Actual Gate Out time and Actual Wheels Off time, in minutes.
• Departure Cancellations. The number of canceled Departures for scheduled flights. Determined next day using flight plan cancellation messages and scheduled flights not flown. ASQP cancellations are used when available.
• Diversions. The number of flights that were diverted en route from their originally scheduled destination to an alternative airport.
• Excess 100 to 40. Average Excess Minutes 100 To 40 Miles. The average difference between the actual and unimpeded time from 100 to 40 miles from the arrival airport. The unimpeded time is the average time in the previous 12-months, for the 20% of flights with the shortest travel distance, for a given 40-mile crossing point, equipment type, weight class, meteorological conditions, and runway configuration.
• Excess 40 to On. Average Excess Minutes 40 To Wheels On. The average difference between the actual and unimpeded time from 40 miles to wheels on. The unimpeded time is the average time in the previous 12-months for the 20% of flights with the shortest travel distance from 100 to 40, for a given 40-mile crossing point, equipment type, weight class, meteorological conditions, and runway configuration.
• Excess Time Flown.
• Facility. In Operations Seasonal Baselines, the average number of operations at the selected facility for the month and day of the week.
• Go Arounds. An aborted landing of an aircraft on final approach. The reported numbers do NOT include Military, HELO, “Touch and Go”, unknown, or untagged operations.
• MIT MINMILES (ARR ARPT).
• OPSNET Delays. Delays to Instrument Flight Rules (IFR) traffic of 15 minutes or more, which result from the ATC system detaining an aircraft at the gate, short of the runway, on the runway, on a taxiway, or in a holding configuration anywhere en route.
• OPSNET Equipment Delays. Delays to Instrument Flight Rules (IFR) traffic of 15 minutes or more due to FAA and non-FAA equipment malfunction. For more information, see Types of Delay.
• OPSNET Loc Dep Delays. Delays to Instrument Flight Rules (IFR) traffic of 15 minutes or more due to weather conditions at the departure airport. For more information, see Types of Delay.
• OPSNET Other Delays. Delays to Instrument Flight Rules (IFR) traffic of 15 minutes or more due to "other" factors. For more information, see Types of Delay.
• OPSNET Runway Delays. Delays to Instrument Flight Rules (IFR) traffic of 15 minutes or more due to runway capacity. For more information, see Types of Delay.
• OPSNET Volume Delays. Delays to Instrument Flight Rules (IFR) traffic of 15 minutes or more due to the volume of traffic at an airport. For more information, see Types of Delay.
• OPSNET Weather Delays. Delays to Instrument Flight Rules (IFR) traffic of 15 minutes or more due to weather conditions at airports and en route. For more information, see Types of Delay.
• Weather % Scheduled Operations in M/S.
• MIT Restrictions. The NAS total Miles-in-Trail (MIT) restrictions as "minute/miles". Minute/miles are calculated by multiplying MIT restriction duration (in minutes) by the severity of the restriction (in miles). For example, a restriction lasting 30 minutes, for 20 miles-in-trail = 600 minute/miles. The metric is a total of all MIT minute/miles in the NAS for which data is available for the period. Source: NTML.
• TRACON. In Operations Seasonal Baselines, the average number of TRACON operations at the selected facility for the month and day of the week.