What is one common procedure for spacing aircraft during landing?

Using the "final approach" to establish a safe landing interval is a common and crucial procedure in air traffic control for spacing aircraft during landing. This phase of flight occurs when an aircraft is close to the airport, typically descending toward the runway. By managing the timing and positioning of aircraft during this critical segment, air traffic controllers can ensure that each aircraft has an adequate distance from the one in front, allowing for safe landings. This helps prevent potential collisions, reduces wake turbulence issues, and allows for smooth operations, especially in busy airspace.

The other options do not reflect standard or effective procedures for ensuring safe landings. Staggered takeoff intervals tend to relate more to departures than landings. Directing all aircraft to land simultaneously could lead to dangerous situations. Requiring all aircraft to orbit the airport would create unnecessary delays and could lead to increased congestion and fuel consumption, which is contrary to efficient air traffic management practices.