The Concorde was an engineering masterpiece and the undisputed "Gold Standard" of 20th-century aviation, famously enabling travelers to "arrive before they left" due to its ability to outpace time zones. Flying at Mach 2.04 (over 1,350 mph), it cut the flight time from London to New York to just under 3.5 hours. It operated at 60,000 feet, allowing passengers to view the Earth's curvature. Despite its speed and luxury, its success was hampered by extreme operating costs, high ticket prices, and the "sonic boom" which restricted it to over-ocean routes. While technologically superior, it was ultimately retired in 2003 due to its economic inefficiency and environmental noise.