Aircraft must complete what before an arrival aircraft crosses the landing threshold?

The requirement for an aircraft to complete its exit from the runway before an arrival aircraft crosses the landing threshold is critical for ensuring the safety and efficiency of airport operations. When a landing aircraft is about to touch down, it is important that the runway is clear to prevent potential collisions.

Once an aircraft has landed, it must vacate the runway quickly and efficiently. This involves exiting the runway at a designated taxiway, allowing for arriving aircraft to land safely without delays or hazards. Therefore, confirming that the preceding aircraft has completely exited the runway ensures that the arrival path is unobstructed, maintaining a smooth flow of air traffic and reducing the risk of runway incursions.

It's essential for air traffic control to monitor this sequence closely, knowing when the runway becomes free for the next arriving aircraft. This protocol is part of the overall safety measures in place at airports to facilitate safe and orderly operations.