Which altitude defines the transition level between RVSM and NON-RVSM operations?

The transition level between Reduced Vertical Separation Minimum (RVSM) and Non-RVSM operations is defined at Flight Level 290 (FL290). RVSM airspace utilizes a vertical separation of 1,000 feet between aircraft operating between FL290 and FL410, as opposed to the standard 2,000 feet that is used below and above these altitudes in Non-RVSM airspace.

This distinction is crucial for air traffic management, as it allows for increased capacity and efficiency in higher altitudes where aircraft are more likely to encounter cruising conditions. Flight Level 290 serves as a threshold marking the beginning of RVSM operations, ensuring that aircraft operating within this airspace maintain proper separation and safety standards.