Why was the pilot’s request for higher altitude not approved?

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Pilot's Altitude Request Denied Due to Air Traffic Congestion

The pilot of AirAsia Flight QZ8501 was unable to receive approval to ascend to a higher altitude to circumvent a storm because the flight path was occupied by other aircraft. Indonesia's air traffic control, AirNav, indicated that the request was denied due to the presence of planes positioned above QZ8501 on the frequently used route.
Air Traffic Control Procedures for Altitude Requests

Air traffic control systems manage aircraft movements by assigning specific flight levels, which are altitudes that correspond to certain pressure settings. When a pilot requests a change in altitude, especially to deviate from a planned route or avoid weather, air traffic controllers must assess the overall traffic situation within their sector. This assessment involves checking for potential conflicts with other aircraft that are already at, or assigned to, nearby altitudes or flight levels.
The Concept of Flight Levels and Airways

Airways are designated aerial corridors that aircraft follow, and these are structured with specific altitudes or "flight levels" assigned to different directions of travel to maintain separation. Flight levels are standardized to ensure that all aircraft maintain consistent vertical separation regardless of local atmospheric pressure variations. On busy routes, multiple aircraft may be operating within close proximity, making it challenging to grant altitude change requests without compromising the established safety margins between flights.
Impact of a Busy Route on Altitude Deviations

When a popular air route is experiencing high traffic density, the available "slots" for aircraft at different altitudes become limited. If another aircraft is already occupying a higher flight level that QZ8501 intended to use, or if moving QZ8501 would bring it too close to another aircraft's assigned altitude, air traffic control must deny the request to maintain safe separation standards. This is a standard operational constraint within air traffic management to prevent potential collisions.

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Why was the pilot’s request for higher altitude not approved?

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