What must you ensure when laterally separating aircraft in a holding pattern?

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When laterally separating aircraft in a holding pattern, it is crucial to ensure that the aircraft are cleared to hold over different fixes. This means that each aircraft is assigned to a unique holding pattern, which prevents them from intersecting paths and ensures safe operation within the airspace.

By having aircraft hold over different fixes, ATC can maintain adequate separation and avoid potential conflicts. This is essential, as holding patterns are often used to manage traffic flows, especially when a runway is unavailable or when aircraft need to wait for landing clearance. The separation maintained by utilizing different fixes is a key operational standard in air traffic management.

The other options, while they relate to air traffic control practices, do not provide the necessary measures for effective lateral separation in a holding scenario. For example, having the same fix for both aircraft could lead to conflicts, while airspace overlap isn't advisable, and simply varying altitudes without distinct fixes may not ensure safe lateral separation.