To preclude two aircraft having the same EAT, new EATs shall be issued from which order?

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Multiple Choice

To preclude two aircraft having the same EAT, new EATs shall be issued from which order?

When two aircraft would share the same Estimated Arrival Time, the new ETAs should be issued starting with the aircraft that is later in the sequence and then working backward to the earlier one. This latest-to-earliest approach preserves the established flow for the earlier arrivals and minimizes the amount of rework, since adjusting the later slots first avoids cascading changes that would ripple back to the earlier times. If you started with the earliest, you’d likely trigger additional adjustments to subsequent aircraft, creating more conflicts and rework. In practice, you’d take the last aircraft in line with the conflicting ETA, move its ETA slightly later, then check if the earlier aircraft still conflicts and adjust only as needed.

When two aircraft would share the same Estimated Arrival Time, the new ETAs should be issued starting with the aircraft that is later in the sequence and then working backward to the earlier one. This latest-to-earliest approach preserves the established flow for the earlier arrivals and minimizes the amount of rework, since adjusting the later slots first avoids cascading changes that would ripple back to the earlier times. If you started with the earliest, you’d likely trigger additional adjustments to subsequent aircraft, creating more conflicts and rework. In practice, you’d take the last aircraft in line with the conflicting ETA, move its ETA slightly later, then check if the earlier aircraft still conflicts and adjust only as needed.

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