A truly mind-bending fact about the Concorde is that the aircraft actually grew in length by 6 to 10 inches during flight. This wasn't a mechanical feature, but a result of physics: because the Concorde flew at supersonic speeds (over 1,350 mph), the friction of the air against the fuselage created intense heat, causing the aluminum skin to reach temperatures of up to 127°C (260°F). This heat caused the entire airframe to expand. The flight deck crew would famously notice a gap opening up between the flight engineer’s console and the bulkhead wall, large enough to put a hand into; by the time the plane landed and cooled down, this gap would disappear. Another "cool" fact is that because the Concorde flew at 60,000 feet, passengers could actually see the curvature of the Earth against the dark indigo of the edge of space. It was the only commercial airliner where you could arrive in New York "before" you left London, effectively traveling faster than the rotation of the planet and witnessing the sun rise in the West.