We recommend customers to use the following method using the Flight Status API:
> Prior to the flight's departure (Estimated Delay)
Compare the Estimated Gate Departure time with the Scheduled Gate Departure time. If the Estimated Gate Departure time is not available, you should default to using the Published or Scheduled Gate Departure time.
> When the flight has left the gate and is en-route (Actual Delay)
Compare the Actual Gate Departure time with the Scheduled Gate Departure time. If both Estimated Gate Departure and Actual Gate Departure times are not available, you should default to using the Published or Scheduled Gate Departure times.
If Delay >= 15 minutes = Late
If Delay >= 30 minutes = Very Late
If Delay >= 45 minutes = Excessive
Please note: The actualRunwayDeparture is an optional field. In some cases we get a gate departure and the runway times are null and the flight did take off. If scheduled runway times are not available, default to using scheduled gate times.
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