What separation is achieved by the assignment of different altitudes or flight levels?

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The assignment of different altitudes or flight levels achieves vertical separation between aircraft. This is crucial for maintaining safe distances both vertically and horizontally in the airspace, as it minimizes the risk of collisions during flight. Vertical separation allows multiple aircraft to operate in the same airspace safely but at different altitudes, which is essential given the high volume of air traffic. This method of separation is particularly effective in busy air corridors and during climb or descent phases of flight, where altitude changes are common. Understanding vertical separation helps air traffic controllers manage airspace efficiently and ensures a safe environment for all flights.