The protected airspace of a holding pattern must not _______ of an airway.

The correct response identifies the critical concept that the protected airspace of a holding pattern must not overlap the protected airspace of an airway. This is fundamental in air traffic control to ensure that aircraft operating in holding patterns do not conflict with the paths of other active aircraft, thereby preventing potential collisions and maintaining safety.

When a holding pattern is established, airspace must be preserved around it to allow for the smooth and safe transition of aircraft entering and exiting the holding pattern. If the protected airspace were to overlap with that of an airway, it could lead to unsafe situations where aircraft could inadvertently enter each other's zones, violating safety protocols and regulations in air traffic management.

Maintaining distinct and non-overlapping airspace is a cornerstone of air traffic control procedures, ensuring that all aircraft can operate safely and efficiently in close proximity to one another.