Airplane speed is a critical factor in modern aviation, allowing for quick and efficient travel over great distances. At cruising altitude, which is normally between 30,000 and 40,000 feet, most commercial aircraft fly at a cruising speed of 500 to 600 miles per hour (800 to 960 kilometers per hour). This speed is great for long-distance travel, allowing planes to fly thousands of miles in just a few hours. However, speeds might vary based on the aircraft type, route, and outside conditions. Pilots carefully control aircraft speed to strike a balance between fuel efficiency and optimal flight times. Furthermore, strong tailwinds can significantly improve a plane's speed, allowing for shorter journeys.