According to the ZAE/ZHU LOA, how low must aircraft west of J31 landing at KVKS or in the Jackson terminal area cross the center boundary?

The requirement for aircraft west of J31 that are landing at KVKS or within the Jackson terminal area to cross the center boundary at FL230 is established to ensure safe vertical separation from other traffic and to facilitate efficient traffic flow into busy terminal areas. By specifying this altitude, air traffic control maintains organized transitions between different airspace sectors, particularly as aircraft approach their destination.

Crossing at FL230 allows sufficient vertical separation from higher altitude aircraft while also accommodating the descending profiles of those aircraft entering the terminal airspace. This altitude serves as a safety buffer, ensuring that ground traffic management can occur without interference and helps controllers maintain an orderly flow, particularly in busy airspace. Therefore, adhering to this specific crossing altitude is essential for maintaining safety and efficiency as aircraft transition to and from terminal areas.