Sourced developments at US airports: what the FAA reports at every airport, and what we measure and our model forecasts at the busiest ones.
Partly stale · checked FAA NAS status 222 hstaleForecast cycle 89 minLightning 222 hstaleWeather observations no datastaleFAA surface data 1 minFAA flight data 2 min
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What changed: about 8 → 4 expected cancellations since the 2:00 AM EST forecast
Adding up each flight’s cancellation probability, Tailodds’ model expects about 4 of the 77 departures scheduled noon–3 PM Friday to be cancelled (5%). With calm weather it would expect about 1. From the 3:00 AM EST forecast (model famB-sd-v4i). This is a forecast, not a report of cancellations.
What changed: 47% → 35% since the 2:00 AM EST forecast (same model, same window)
Tailodds’ model gives the 77 departures scheduled from Boston noon–3 PM Friday an average 35% chance of leaving 15+ minutes late. With calm weather the same flights would average 19%. From the 3:00 AM EST forecast (model famB-sd-v4i). This is a forecast, not a report of delays.
Tailodds’ model gives the 118 departures scheduled from Boston 9 AM–noon Friday an average 29% chance of leaving 15+ minutes late. With calm weather the same flights would average 14%. From the 3:00 AM EST forecast (model famB-sd-v4i). This is a forecast, not a report of delays.
What changed: 50% → 38% since the 7:00 PM EST forecast (same model, same window)
Tailodds’ model gives the 104 departures scheduled from Boston 6–9 PM Friday an average 38% chance of leaving 15+ minutes late. With calm weather the same flights would average 28%. From the 2:00 AM EST forecast (model famA-fc-v3). This is a forecast, not a report of delays.
What changed: 50% → 38% since the 4:00 PM EST forecast (model changed)
Tailodds’ model gives the 96 departures scheduled from Boston 3–6 PM Friday an average 38% chance of leaving 15+ minutes late. With calm weather the same flights would average 26%. From the 2:00 AM EST forecast (model famA-fc-v3+famB-sd-v4i). The model changed since the previous item (from famA-fc-v3), so some or all of this change comes from the new model rather than new information. This is a forecast, not a report of delays.
Probability 38%Horizon 11.5 hModel famA-fc-v3+famB-sd-v4iModel changed
Of 31 arrivals that landed between 11:32 PM and 12:32 AM EST, 23 reached the gate at least 15 minutes late. Typically 26% of arrivals at Boston arrive that late (US DOT on-time data, last 12 published months, all arrivals). Measured by Tailodds from FAA flight data against airline schedules.
Window 11:32 PM–12:32 AM ESTSample 31 flightsLate 74%Typical 26%
Adding up each flight’s cancellation probability, Tailodds’ model expects about 8 of the 117 departures scheduled 9 AM–noon Friday to be cancelled (6%). With calm weather it would expect about 1. From the 10:00 PM EST forecast (model famA-fc-v3+famB-sd-v4i). This is a forecast, not a report of cancellations.
Of 19 departures that took off between 9:34 PM and 10:34 PM EST, 16 left at least 15 minutes late. Boston typically sees 47% of departures in this hour leave that late (US DOT on-time data, last 12 published months, departures in the 10 PM hour). Measured by Tailodds from FAA flight data against airline schedules.
Adding up each flight’s cancellation probability, Tailodds’ model expects about 9 of the 112 departures scheduled 6–9 AM Friday to be cancelled (8%). With calm weather it would expect about 1. From the 7:00 PM EST forecast (model famA-fc-v3+famB-sd-v4i). This is a forecast, not a report of cancellations.
What changed: 61% → 60% since the 2:00 PM EST forecast (same model, same window)
Tailodds’ model gives the 22 departures scheduled from Boston 9 PM–midnight Thursday an average 60% chance of leaving 15+ minutes late. With calm weather the same flights would average 37%. From the 7:00 PM EST forecast (model famB-sd-v4i). This is a forecast, not a report of delays.
Adding up each flight’s cancellation probability, Tailodds’ model expects about 6 of the 101 departures scheduled 6–9 PM Thursday to be cancelled (5%). With calm weather it would expect about 1. From the 4:00 PM EST forecast (model famB-sd-v4i). This is a forecast, not a report of cancellations.
What changed: 58% → 71% since the 1:00 PM EST forecast (same model, same window)
Tailodds’ model gives the 101 departures scheduled from Boston 6–9 PM Thursday an average 71% chance of leaving 15+ minutes late. With calm weather the same flights would average 30%. From the 2:00 PM EST forecast (model famB-sd-v4i). This is a forecast, not a report of delays.
Of the 45 departures scheduled from Boston (BOS) between 2:10 PM and 3:40 PM EST, FAA flight plans name the aircraft for 27. For 10 of those, the aircraft’s previous flight into BOS is due at the gate less than 35 minutes before the scheduled departure, or after it (FAA arrival times or estimates plus the airport’s typical taxi time); 2 of those inbound flights have not taken off yet. Measured by Tailodds from FAA flight data; it does not mean each of these departures will leave late.
Next 2:10 PM–3:40 PM ESTTight turns 10 of 27Share 37%
Source: Tailodds measurement of FAA flight plans and arrival estimates against airline schedulesTimeline (1)View BOS
Tailodds’ model gives the 91 departures scheduled from Boston 3–6 PM Thursday an average 47% chance of leaving 15+ minutes late. With calm weather the same flights would average 24%. From the 4:00 PM EST forecast (model famA-fc-v3). This is a forecast, not a report of delays.
Of 26 arrivals that landed between 8:46 PM and 9:46 PM EST, 1 reached the gate at least 15 minutes late. Typically 26% of arrivals at Boston arrive that late (US DOT on-time data, last 12 published months, all arrivals). Measured by Tailodds from FAA flight data against airline schedules. The late share has stayed at or below 30% for 31 minutes across 16 checks, each with at least 12 flights and current data.
Of 25 arrivals that landed between 5:53 PM and 6:53 PM EST, 5 reached the gate at least 15 minutes late. Typically 26% of arrivals at Boston arrive that late (US DOT on-time data, last 12 published months, all arrivals). Measured by Tailodds from FAA flight data against airline schedules. The late share has stayed at or below 30% for 31 minutes across 16 checks, each with at least 12 flights and current data.
Of 22 arrivals that landed between 11:26 PM and 12:26 AM EST, 5 reached the gate at least 15 minutes late. Typically 26% of arrivals at Boston arrive that late (US DOT on-time data, last 12 published months, all arrivals). Measured by Tailodds from FAA flight data against airline schedules. The late share has stayed at or below 30% for 31 minutes across 16 checks, each with at least 12 flights and current data.
Window 11:26 PM–12:26 AM ESTSample 22 flightsLate 23%Typical 26%
Of 22 departures that took off between 9:42 PM and 10:42 PM EST, 16 left at least 15 minutes late. Boston typically sees 47% of departures in this hour leave that late (US DOT on-time data, last 12 published months, departures in the 10 PM hour). Measured by Tailodds from FAA flight data against airline schedules.
What changed: 62% → 55% since the 11:00 AM EST forecast (same model, same window)
Tailodds’ model gives the 77 departures scheduled from Boston 6–9 PM Saturday an average 55% chance of leaving 15+ minutes late. With calm weather the same flights would average 31%. From the 2:00 PM EST forecast (model famB-sd-v4i). This is a forecast, not a report of delays.
Of 16 departures that took off between 1:31 PM and 2:31 PM EST, 3 left at least 15 minutes late. Boston typically sees 24% of departures in this hour leave that late (US DOT on-time data, last 12 published months, departures in the 2 PM hour). Measured by Tailodds from FAA flight data against airline schedules. The late share has stayed at or below 30% for 31 minutes across 16 checks, each with at least 12 flights and current data.
Of 17 arrivals that landed between 12:02 PM and 1:02 PM EST, 4 reached the gate at least 15 minutes late. Typically 26% of arrivals at Boston arrive that late (US DOT on-time data, last 12 published months, all arrivals). Measured by Tailodds from FAA flight data against airline schedules. The late share has stayed at or below 30% for 32 minutes across 16 checks, each with at least 12 flights and current data.
What changed: 60% → 52% since the 9:00 AM EST forecast (model changed)
Tailodds’ model gives the 17 departures scheduled from Boston 9 PM–midnight Saturday an average 52% chance of leaving 15+ minutes late. With calm weather the same flights would average 22%. From the 11:00 AM EST forecast (model famB-sd-v4i). The model changed since the previous item (from famA-fc-v3+famB-sd-v4i), so some or all of this change comes from the new model rather than new information. This is a forecast, not a report of delays.
Probability 52%Horizon 9.0 hModel famB-sd-v4iModel changed
What changed: 72% → 61% since the 10:00 AM EST forecast (same model, same window)
Tailodds’ model gives the 87 departures scheduled from Boston 3–6 PM Saturday an average 61% chance of leaving 15+ minutes late. With calm weather the same flights would average 28%. From the 11:00 AM EST forecast (model famB-sd-v4i). This is a forecast, not a report of delays.
What changed: 60% → 48% since the 9:00 AM EST forecast (same model, same window)
Tailodds’ model gives the 81 departures scheduled from Boston noon–3 PM Saturday an average 48% chance of leaving 15+ minutes late. With calm weather the same flights would average 28%. From the 11:00 AM EST forecast (model famB-sd-v4i). This is a forecast, not a report of delays.
Adding up each flight’s cancellation probability, Tailodds’ model expects about 2 of the 81 departures scheduled noon–3 PM Saturday to be cancelled (3%). With calm weather it would expect about 1. From the 6:00 AM EST forecast (model famB-sd-v4i). This is a forecast, not a report of cancellations.
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