Triple Parallel Takeoff/Landing Capabilities are a necessity for many large airports as it allows many aircraft to arrive and depart in a short amount of time. Each country sets its own standards for the separation between runways required for parallel approaches. In the United States, the Federal Aviation Administration dictates that airports must have at least 3,000 feet (910 m) between runways, though it can grant special permission to conduct parallel approaches with less separation if deemed necessary.