For any ETA changes, when must you notify ATC?

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Multiple Choice

For any ETA changes, when must you notify ATC?

Explanation:
ATC needs accurate timing to sequence arrivals and manage traffic flow, so a formal update is required when your ETA shifts by a noticeable amount. The threshold of 30 minutes is used because it flags a meaningful change that could impact arrivals or spacing, while smaller fluctuations can be absorbed in real-time planning. If your ETA changes by less than 30 minutes, ATC generally doesn’t require an update. A change of 60 minutes would also trigger a notification because it’s well beyond the threshold.

ATC needs accurate timing to sequence arrivals and manage traffic flow, so a formal update is required when your ETA shifts by a noticeable amount. The threshold of 30 minutes is used because it flags a meaningful change that could impact arrivals or spacing, while smaller fluctuations can be absorbed in real-time planning. If your ETA changes by less than 30 minutes, ATC generally doesn’t require an update. A change of 60 minutes would also trigger a notification because it’s well beyond the threshold.

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